bluuebunny/crossref_metadata_2025 huggingface dataset:
Designing a LEGO-based microscope for an educational setting
Authors: Vos Bart E. , Betz Timo
Published: January 2022

Here we present the design of a high-resolution, high-magnification micro- scope using LEGO® bricks and easily-available lenses. With the provided workflow and suggested experiments, we show that 9-to-13-year old students significantly increased their understanding of microscopy.
Motivating And Engaging Lighting Students When Learning Remotely
Authors: Hu Wenye , Davis Wendy
Published: January 2022

To engage students remotely, industry-relevant material and authentic problem solving activities have been integrated into the lighting curriculum to inspire career goal setting, while EdTech has been used to chunk lectures and scaffold student learning.
Building an online collaborative environment for graduate researchers’ development: the 2020 Montreal Photonics Networking Event
Authors: Posner Matthew T. , Dhillon Ajaypal , Zhuldybina Mariia , Crockett Benjamin , Kohli Niharika , Boisvert Jean- Sebastien , Spilkin Amanda , Nolet David , Liboiron-Ladouceur Odile
Published: January 2022

This paper discusses motivations and challenges behind the online transition of the Montreal Photonics Networking event. Design, organization strategies, and outcomes of this educational and community-focused activity are presented.
Plasmonics for Dummies: a proposal for teaching fundamentals of plasmonics
Authors: Agudelo González S. M. , Herreño-Fierro C. A.
Published: January 2022

We present a video clip collection aimed at assisting first-year undergraduate students in learning the fundamentals of plasmonics. The work includes the design of an educational assessment of the collection's effectiveness in achieving such a goal.
Using the Lorentz Reciprocity Theorem with the Transfer Matrix Method in Python
Authors: Zossimova Ekaterina , Akimov Yuriy
Published: January 2022

We present a simple way to calculate and visualize far-field radiation patterns due to polarizable particles at the surface of complex multilayer materials by means of the Lorentz reciprocity theorem and the python Jupyter notebook.
Teaching Quantum Concepts with Classical Optics
Authors: Qian Xiaofeng
Published: January 2022

We propose to educate quantum concepts through the analogous classical light context. An optics platform has the advantage of being stable, controllable, visualizable, as well as accessible to pre-college students.
Learning to be a skilled optical scientist or engineer; the 29 decision process
Authors: Wieman Carl
Published: January 2022

By studying how many expert scientists and engineers solve problems, we have a recently developed a much better understanding of the problem-solving process, and how to measure and teach expert problem solving in science
Curricular Structure for Teaching Ethical and Professional Conduct in Optics and Photonics
Authors: Kuebler Stephen M. , Beever Jonathan , Pinkert Laurie
Published: January 2022

A full course focused on ethics and professional practice has been developed to complement technical coursework and provide comprehensive training for engineers studying optics. Related frameworks for ethical enculturation are under study.
Optical Surface Profilometry as a Means to Build Experimental Research Skills Including Planning
Authors: Kane D M , Little D J
Published: January 2022

An optical surface profiler is used as a sophisticated, high-tech, “high”-cost instrument for learning experimental research skills in the context of a Masters in Research degree. Students are being prepared for higher degree research.
Student Learning through Independent Projects in Introductory Optics
Authors: Dark Marta L. , Merriweather Chloe M.
Published: January 2022

During a semester-long introductory optics course, each student is required to develop an experimental optics-related project from proposal to completion. We present outcomes on student learning from this multi-week, student-driven course component.
First-Year Seminar Course on the People of Medical Imaging
Authors: Durst Michael E.
Published: January 2022

This first-year seminar course covers the history of modern physics using biomedical imaging as an overarching theme, focusing on both the scientists who made key discoveries and those unrecognized for their work.
A Thematic Review of the Present Photonic Education
Authors: Yalcin Humeyra Azize , Cepni Salih , Aydemir Umut
Published: January 2022

In the presented study, we discussed the thematic review of 68 recent conference studies focused on elementary and secondary school levels to enlighten the future needs of Optics and Photonics Education.
Biophotonics box: educational kit for multidisciplinary outreach activities in optics and photonics
Authors: Nogueira Marcelo Saito , Komolibus Katarzyna , Tobo Andrea Liliana Pacheco , Jayet Baptiste , Sekar Sanathana Konugolu Venkata , Sorensen Simon , Tyndall Caitriona , Andersson-Engels Stefan
Published: January 2022

The biophotonics box enables multidisciplinary/interdisciplinary and self-paced learning with at-home experiments using low-resource components. Experiments can increase the interest of students in STEM subjects by emphasizing the real-life applications in biology and medicine.
Method for extracting the full-field dispersion data of birefringent objects based on the digital RGB photoelasticity
Authors: Raslan M. I. , Sokkar T. Z. N.
Published: January 2022

In this paper, we are presenting a new photoelastic pattern analysis technique to find the point-wise distribution of the dispersion data of birefringent materials. This technique can be applied to profile the dispersion data in three dimensions during static, online, real-time, and dynamic investigations using the well-known digital photoelasticity technique. This method is applied to characterize the dispersion parameters of monofilament isotactic polypropylene fibers. The photoelastic patterns are included for illustration.
Analysis of melt pool inhomogeneity in LPBF using optical process monitoring systems
Authors: Harbig Jana , Theis Tim , Merschroth Holger , Weigold Matthias
Published: January 2022

Process anomalies affected by unsteady process conditions due to
scanning strategy are quantified by photodiodes and high-speed-camera
in order to correct them with locally adapted parameters. This
approach enables the homogenization of the process quality.
Ultrafast Manipulation of Electro-Absorption in Colloidal Quantum Dots by MV/cm-THz Fields from DAST driven by mid-IR Pulses
Authors: Gollner Claudia , Jutas Rokas , Shalaby Mostafa , Dirin Dimitry N. , Boehme Simon C. , Kovalenko Maksym V. , Brodeur Corinne , Baltuška Andrius , Pugžlys Audrius
Published: January 2022

We present a comparative study on efficient THz generation by optical
rectification of 3.9 µm and 1.95 µm pulses in DAST, achieving up to 40
MV/cm field amplitudes. The ultrafast free-space THz signal is encoded
onto an optical signal probing the absorption of CdSe/ CdS core/shell
quantum dots.
Recent Development Activities of Energetic Ion Source Driven by High-intensity Laser Toward Heavy Ion Therapy at QST
Authors: Mori Michiaki
Published: January 2022

QST has started a project to develop a next generation heavy ion
radiotherapy system. The laser-driven ion acceleration is used for the
injector, while the superconducting technology for the synchrotron for
innovative downsizing.
Laser Multiscale 3D Lithography of Plant Based Resins
Authors: Malinauskas Mangirdas
Published: January 2022

Ultrafast laser lithography empowers 3D printing of nano- to
centi-meter sized objects of diverse plant-based resins. The renewable
materials offer comparable performance to commercial photopolymers -
are validated for rapid prototyping and additive manufacturing
tasks.
Microwave Photonic Crystals for Electro-Optic Quantum Transduction
Authors: Hu Y. , Khanna M. , Ligato C. , Purdy T. P.
Published: January 2022

We are building dielectric, centimeter-scale microwave photonic crystal cavi- ties with high Q/V coupled to LiNbO3 nonlinear optical resonators for electro-optic quan-tum transduction.
Autler-Townes Splitting and chi-2 Turing-Rolls in Microresonators
Authors: Skryabin D.V. , Puzyrev D.N. , Pankratov V.V. , Villois A.
Published: January 2022

We demonstrate that the generation of the sparse, i.e., Turing-pattern-like, frequency combs in chi-2 microresonators is explained by the four distinct signal-idler- pump photon energy conservation laws. The transformation of the usually unique three- photon energy conservation to the four conditions happens due to the effect analogous to the Autler-Townes splitting known in the strong photon-atom interaction.
A synchronisation free, versatile Optical Parametric Amplifier as a low cost light source for multiphoton imaging.
Authors: Bourdakos Konstantinos N. , Xu Duanyang , Johnson Peter B. , Crisford Anna , Xu Lin , Liang Sijing , Price Jonathan H. V. , Richardson David J. , Mahajan Sumeet
Published: January 2022

An optical parametric amplifier (OPA) seeded by a continuous wave laser diode and pumped by a picosecond laser at 1031 nm is presented. The performance of the OPA in multi- photonic microscopy is demonstrated.
Polarimetric Second-Harmonic Generation Microscopy of Collagen for Differentiation of Normal and Cancerous Tissue
Authors: Mažeika Viktoras , Mačiulis Mykolas , Riauka Martynas , Kontenis Lukas , Žurauskas Edvardas , Mirsanaye Kamdin , Barzda Virginijus
Published: January 2022

Polarimetric second-harmonic generation microscopy was used to acquire images of collagen in normal and cancerous human colon histological samples, and texture analysis was applied to investigate the changes in the collagen structure.
A TIGER nonlinear optical widefield microscope: game-changer for in-vivo-applications of harmonic nanoparticles
Authors: Vittadello Laura , Klenen Jan , Imlau Mirco
Published: January 2022

A widefield nonlinear optical microscope based on pulses having an energy in the µJ and a repetition rate in the kHz regime is conceived to perform harmonic nanoparticles in-vivo tracking in a Drosophila larva.
Direct Optical Modulation of Photonic Crystal Fano Laser via the Mirror
Authors: Dong Gaoneng , Liang Shih Lun , Yu Yi , Sakanas Aurimas , Semenova Elizaveta , Yvind Kresten , Mork Jesper
Published: January 2022

We experimentally demonstrate that a semiconductor Fano laser can be modulated via the reflectivity of its mirror. This scheme opens a path for high-speed and low-energy modulation of microlasers.
Increasing the Efficiency of Optical Parametric Amplifiers With Polarization-Based Idler Elimination
Authors: Budriūnas Rimantas , Kučinskas Dainius , Valiulis Gintaras , Varanavičius Arūnas
Published: January 2022

We demonstrate that using two nonlinear crystals cut for different phase matching types in an optical parametric amplification stage suppresses back-conversion, which results in considerable improvements of conversion efficiency and signal beam quality.
Efficiency improvement by recycling optical photons in large-aperture LiNbO3 wafer-stacks
Authors: OLGUN H. T. , PERGAMENT M. , KÄRTNER F. X. , MATLIS N. H.
Published: January 2022

We investigated use of photon recycling to improve the efficiency of nonlinear optical- to-narrowband-THz conversion. Improvements of 2x and 3x were demonstrated for serial and back-reflected configurations, respectively, using manually-stacked periodically-poled LiNbO3 wafer-stack macro crystals.
Mode-Locked Thulium-Holmium Doped Fiber Laser using No Core-Graded Index Multimode Fiber as Saturable Absorber
Authors: Azri Muhammad Fadhli Mohd , Samion Muhamad Zharif , Zaini Muhammad Khairol Annuar , Ahmad Harith
Published: January 2022

We demonstrate a mode-locked Thulium-Holmium doped fiber laser at 2 µm using a hybrid structure of no core-graded index multimode fiber. The laser had a frequency and pulse width of 11.90 MHz and 1.651 ps, respectively.
Oscillation Interruption of a Raman Silicon Nanocavity Laser Induced by Positively Ionized-Air Irradiation
Authors: Takahashi Yuki , Yasuda Satoshi , Fujimoto Masanao , Asano Takashi , Kikunaga Kazuya , Noda Susumu , Takahashi Yasushi
Published: January 2022

We show that the response of a Raman silicon nanocavity laser to positively ionized-air irradiation is similar to the response observed for negatively ionized air. This demonstrates the potential of such lasers for sensing applications.
Numerically Processed Interferometric Nonlinear Refractive Index Measurements at 3240 nm
Authors: Jansonas Gaudenis , Budriūnas Rimantas , Varanavičius Arūnas
Published: January 2022

We developed an interferometric technique for measuring the nonlinear refrac- tive index of optical materials with included experimental temporal and spatial intensity profiles. We present measurements of ZnSe, GaSe, AGS and SBN samples at 3240 nm.
Intensity-dependent speckle correlation in a disordered, second-order nonlinear medium
Authors: Samanta Rabisankar , Pierrat Romain , Carminati Rémi , Mujumdar Sushil
Published: January 2022

We investigate speckle correlations in a χ(2)-nonlinear disordered medium. The frequency-doubled speckle decorrelates faster than the fundamental with increasing input power. Two theoretical models are developed for qualitative and quantitative agreement.
Ultra-compact linear mode-locking fiber laser in all polarization-maintaining fibers
Authors: Zhao Minghe , Liu Xuanyi , Fu H. Y. , Li Qian
Published: January 2022

We experimentally and numerically demonstrate an innovative, robust and ultra-compact mode-locked fiber laser using all-polarization-maintaining fibers. Numerical results agree with experiment very well.
Antireflection microstructures fabricated on GaSe surface for 5–15 µm range
Authors: Bushunov Andrey A. , Tarabrin Mikhail K. , Teslenko Andrei A. , Lazarev Vladimir A. , Isaenko Lyudmila. I. , Yelisseyev Alexander. P. , Lobanov Sergei I.
Published: January 2022

We report GaSe crystal single-surface transmittance enhancement up to 95% in the range from 5µm to 15 µm by femtosecond laser ablation micro-structuring. Such treatment allows increasing the effectiveness of frequency conversion in devices utilizing nonlinear crystals.
Design Characteristics of a Raman Silicon Nanocavity Laser for Efficient Emission of Light Into an Adjacent Waveguide
Authors: Saito Yuki , Asano Takashi , Noda Susumu , Takahashi Yasushi
Published: January 2022

Our numerical investigation indicates that, in a Raman Si nanocavity laser, optimized quality factors and waveguides with heterointerfaces are required for efficient emission of the laser light into the planar waveguide for the Stokes light.
Temporal Cavity Solitons in an Active Cavity
Authors: Englebert Nicolas , Arabí Carlos Mas , Parra-Rivas Pedro , Gorza Simon-Pierre , Leo François
Published: January 2022

We demonstrate the existence of temporal solitons in a laser pumped below its oscillation threshold. Through bifurcation analysis and experimental measurements, we show how the gain saturation impacts this new localized structure.
Unifying Airy-Like Self-Acceleration and Diametric Drive Acceleration
Authors: Zhang Ping , Bongiovanni Domenico , Hu Yi , Li Zhili , Morandotti Roberto , Chen Zhigang , Xu Jingjun
Published: January 2022

We propose a scheme to unify two types of self-accelerating phenomena widely emerging in wave dynamics and demonstrate the connection in a nonlinear optical fiber system via interaction between properly-shaped temporal solitons and Airy-like pulses.
Advances in nonlinear optics in gas-filled hollow-core fibers
Authors: Travers John C. , Brahms Christian , Belli Federico , Grigorova Teodora F. , Lekosiotis Athanasios , Sabbah Mohammed
Published: January 2022

Gas-filled hollow-core fibres, both with and without microstructure, provide a versatile system for ultrafast nonlinear optics. We report recent advances in deep and vacuum ultraviolet generation, sub-cycle pulse compression, and supercontinuum generation.
Approaching epsilon-near-zero regime in gas-filled photonic-crystal fibres
Authors: Saleh Mohammed F. , Biancalana Fabio
Published: January 2022

We have exploited the photoionisation process in gas-filled hollow-core photonic-crystal fibres to obtain an ultra-broadband supercontinuum generation via approaching the epsilon-near-zero regime that enhances the Kerr nonlinearity and allows the dispersion profile to be dynamic.
1.2-Octave Coherent OAM Supercontinuum Generation in Germanium-Doped Ring-Core Fiber
Authors: Yang Jian , Wang Yingning , Fang Yuxi , Geng Wenpu , Zhao Wenqian , Wang Zhi , Liu Yan-ge , Bao Changjing , Ren Yongxiong , Pan Zhongqi , Yue Yang
Published: January 2022

Coherence supercontinuum of light-carrying OAM is generated over 1.2-octave spectral range from 852 nm to 2059 nm, by launching a 30-fs 60-kW hyperbolic secant pulse in a 3-cm Ge-doped ring-core silica fiber with all-normal dispersion.
Localized light in a fractal-like photonic lattice
Authors: Hanafi Haissam , Menz Philip , Denz Cornelia
Published: January 2022

We demonstrate light localization in a frustrated fractal-like photonic lattice owing multiple flat bands fabricated by femtosecond direct laser writing. We investigate the arising flat bands depending on the singularities of their Bloch wave functions.
Nanoscale Spontaneous Parametric Down-Conversion
Authors: Chekhova Maria
Published: January 2022

We generate entangled photons via spontaneous parametric down-conversion (SPDC) in subwavelength films of nonlinear materials and all-dielectric nonlinear metasurfaces. The SPDC spectra reveal resonances: Fabry-Perot in the first case and Mie in the second case.
High efficiency generation of path entangled bi-photons directly from 2D poled nonlinear crystal
Authors: Di Domenico Giuseppe , Pearl Shaul , Karnieli Aviv , Trajtenberg-Mills Sivan , Juwiler Irit , Eisenberg Hagai S. , Arie Ady
Published: January 2022

A new photonic N00N state source is presented, where the two entangled photons are directly generated at a spatially shaped periodically poled nonlinear crystal. An interference experiment shows the super resolution that characterize such states.
A Fiber Photon-Pair Source for Enhanced Spectroscopy and Imaging
Authors: Pearce Emma , Phillips Chris C. , Oulton Rupert F. , Clark Alex S.
Published: January 2022

We generate photon pairs using spontaneous four-wave mixing in a birefringent single-mode fiber. Photon-number correlations reduce noise in the band-edge absorption spectrum of gallium arsenide. We propose the use of such sources in quantum imaging.
Neuromorphic computing device using optical shock waves
Authors: Pierangeli D. , Marcucci G. , Conti C.
Published: January 2022

We experimentally demonstrate an optical machine learning scheme that uses spatial dispersive shock waves for performing classification and regression tasks. The nonlinear optical device is easy-to-train and reaches accuracies comparable to digital reservoir machines.
Non-Hermitian Dynamics in a Hermitian System
Authors: Flemens Noah , Moses Jeffrey
Published: January 2022

The emergence of an exceptional point and spontaneous PT-symmetry breaking when optical parametric amplification and idler second harmonic generation are simultaneously phase matched leads to behavior characteristic of non-Hermitian systems in a fully Hermitian system.
Machine Learning Aided Nonlinear Polarimetric Microscopy with Texture Analysis for Melanoma Tissue Characterization
Authors: Riauka Martynas , Mazeika Viktoras , Maciulis Mykolas , Zurauskas Edvardas , Kontenis Lukas , Mirsanaye Kamdin , Barzda Virginijus
Published: January 2022

Machine learning aided polarimetric nonlinear microscopy and texture analysis of collagen in cancerous and normal skin tissues revealed the differences in polarimetric and texture parameter distributions suggesting an altered collagen structure.
Deep nonlinear optical neural networks trained with in situ backpropagation
Authors: Wright Logan G. , Onodera Tatsuhiro , Stein Martin M. , Wang Tianyu , Schachter Darren T. , Hu Zoey , McMahon Peter L.
Published: January 2022

We experimentally demonstrate an optical neural network whose fundamental building blocks are controllable ultrafast quadratic nonlinear pulse-propagation processes. The network is trained in situ by a new backpropagation algorithm that generalizes to arbitrary physical systems.
Coexistence of Oscillation Quenching States in Nonlinear Parity-Time-Symmetric Systems
Authors: Choi Seou , Park Namkyoo , Yu Sunkyu
Published: January 2022

We introduce coexisting oscillation quenching states in parity-time-symmetric systems. The degrees of freedom in the triatomic system including nonlinear resonators allow multiple dynamical stabilities with different optical energy distributions at a given system.
Visible to MIR Frequency Comb Generation in Lithium Niobate Waveguides
Authors: Wu Tsung-Han , Fredrick Connor , Xing Sida , Lind Alexander J. , Chang Peter , Lesko Daniel , Hoghooghi Nazanin , Kowligy Abijith , Diddams Scott A.
Published: January 2022

We investigate thin-film lithium niobate waveguides with chirped poling periods for efficient supercontinuum via χ2 and χ3 nonlinearities. Leveraging these nonlinearities, we generate frequency combs spanning from the blue to the mid infrared.
The Influence of Absorption to the Optical Parametric Amplification Bandwidth
Authors: Valiulis Gintaras
Published: January 2022

The bandwidth of the optical parametric amplification (OPA) defines the duration of the signal and idler pulse. In current work, we investigate the influence of the idler wave absorption to the OPA bandwidth.
Multilayered metal-dielectric Ru/TiO2 hyperbolic material for nonlinear optics
Authors: Araiza-Sixtos F. Arturo , Rangel-Rojo Raúl , Tiznado Hugo , Lizárraga-Medina Eder , Solorio-Soto Fernando
Published: January 2022

In this work we present the design and fabrication of hyperbolic materials based on multilayered metal-dielectric Ru/TiO2 structures and a study of their nonlinear response using femtosecond pulses.
Generation of Platicons in Optical Microresonators Enabled by Thermal Effects
Authors: Lobanov Valery E. , Kondratiev Nikita M. , Bilenko Igor A.
Published: January 2022

We show numerically that negative thermal effects can induce the generation of platicons in optical microresonators with normal GVD. Generation conditions are found. Two excitation regimes at forward frequency scan are identified: smooth and oscillatory. The possibility of turn-key operation is also demonstrated.
The role of self-steepening in supercontinuum generation in nanowires
Authors: Linale N. , Hernandez S. M. , Grosz D. F.
Published: January 2022

We present a study of self-steepening in supercontinuum generation in 2D-decorated nanowires with frequency-dependent nonlinearities. We show that there exists an optimum value of the self-steepening parameter which can be achieved by design of the nanowire.
Matter waves in atomic-molecular BEC with Feshbach resonance management
Authors: Abdullaev F. Kh. , Ögren M. , Yuldashev J.
Published: January 2022

Dynamics of matter waves in the atomic to molecular condensate transition with a time modulated atomic scattering length is investigated. The conditions for dynamical suppression of association of atoms into the molecular field are obtained.
Z-scan extensions for inclusive study of nonlinear refractive index
Authors: Bundulis Arturs , Rutkis Martins
Published: January 2022

We present a report of Z-scan extensions that can be used to study nonlinear refractive index. This includes polarization-resolved Z-scan for inducing effect separation and interferometric Z-scan for refractive index gradient and absolute change measurements.
Generation of Vector Platicons and Hybrid Soliton-Platicon Complexes in Optical Microresonators by Modulated Pump
Authors: Lobanov Valery E. , Shitikov Artem E. , Galiev Ramzil R. , Min’kov Kirill N. , Kondratiev Nikita M.
Published: January 2022

We demonstrate numerically the possibility of generation of vector platicons having orthogonally polarized components by the modulated pump at normal GVD. Dynamics of this process can be controlled by pump polarization and depends on the distance between pumped modes and on the difference of their FSRs. We also show the possibility of excitation of soliton-platicon complexes.
CARS Domain-Wall Analysis in single-crystalline Lithium Niobate
Authors: Reitzig Sven , Hempel Franz , Rüsing Michael , Eng Lukas M.
Published: January 2022

We apply coherent anti-Stokes Raman scattering (CARS) for high-speed imaging of domain walls in lithium niobate. The domain wall signature provides similar spectral features as in spontaneous Raman spectroscopy, however at drastically increased scan speeds.
Attosecond control of multi-photon multi-electron dynamics
Authors: Kretschmar M. , Hadjipittas A. , Tümmler J. , Will I. , Nagy T. , Vrakking M. J. J. , Emmanouilidou A. , Schütte B.
Published: January 2022

We demonstrate attosecond control of the multi-photon multiple ionization of argon. While a weakly oscillating Ar2+ is found in an autocorrelation measurement, the Ar3+ ion yield strongly oscillates due to direct multi-photon absorption.
Structuring light’s chirality to induce enantio-sensitive light bending
Authors: Ordonez Andres , Ayuso David , Decleva Piero , Ivanov Misha , Smirnova Olga
Published: January 2022

We introduce structured light with zero net chirality displaying a charge-polarized-like pattern of chirality. It allows perfect enantiomeric discrimination within the dipole approximation on ultrafast time scales, with opposite enantiomers emitting harmonics in opposite directions [arXiv:2004.05191]
Self-Focusing in Guided and Un-guided Media
Authors: Shepard Scott R. , Thompson Heather A.
Published: January 2022

We numerically compare the self-focusing of a Gaussian beam in bulk media to that of guided modes in a cylindrical rod waveguide. We demonstrate delivery of higher power than anticipated from the bulk media calculations.
Soliton formation and frequency-comb generation in diamond-fin waveguides
Authors: Fernandez Laguna Victor M. , Panoiu Nicolae C.
Published: January 2022

We fully characterize linear and nonlinear optical properties of novel subwave-length diamond-fin waveguides, along with an analysis of certain nonlinear optical effects, including soliton generation and frequency comb generation.
Parameter Scans for Characterization of Nonlinear Beam Propagation
Authors: Schiek Roland
Published: January 2022

Intensity-dependent beam propagation inside nonlinear media is difficult to characterize without cutting back — and destroying — the sample. Observing the output dependent on system parameters can provide information on the beam dynamics along the path.
Nonlinear hollow beam generation in plasmonic nanosuspensions
Authors: Zhan Jingyan , Li Denghui , Bongiovanni Domenico , Zhang Yujie , Tang Liqin , Song Daohong , Yang Jianke , Morandotti Roberto , Chen Zhigang
Published: January 2022

We report on hollow beam generation in an otherwise uniform low-power infrared beam co-propagating with a green beam in plasmonic nanosuspensions. Experimentally observed beam dynamics are numerically corroborated based on nonlinear cross-phase modulation.
Wormhole Laser Solitons
Authors: Veretenov N. A. , Fedorov S.V. , Rosanov N.N.
Published: January 2022

Presented are tubular, or wormhole solitons in a ring cavity filled with a medium with nonlinear amplification and absorption. Depending on the cavity length, their vortex lines are straight or curved single or multiple spirals.
Unique Nonlinear Optical Response from a Deep Subwavelength Bi-Metal Dimer
Authors: Niv Avi
Published: January 2022

We show that the second harmonic generation from a subwavelength bi-metal dimer has some unique features that set it apart from the conventional view of this case. A model based on quasistatic interactions between oscillating charges is in good agreement with experiments. Based on this model, we explore higher harmonics generation, optical rectification, and chaos.
Photo-carrier doping dependent electron excitation and high harmonic generation
Authors: Uzundal Can B. , Hollinger Richard , Spielmann Christian , Kartashov Daniil , Zuerch Michael
Published: January 2022

High harmonic generation (HHG) and electron excitation by intense mid-IR pulses upon photo-carrier doping have been investigated. We observe a damped HHG and increased electron excitation process as a function of the free electron density.
Electro-Optic Switching in Silicon-Rich Nitride
Authors: Friedman Alex , Nejadriahi Hani , Sharma Rajat , Fainman Yeshaiahu
Published: January 2022

We demonstrate electro-optic switching using the DC-Kerr effects in a bus-coupled integrated photonic racetrack ring resonator made of Silicon-rich Nitride and find its third order nonlinear susceptibility, χ(3), of 6x10-19 m2/v2.
Vector Properties of Forward Stimulated Brillouin Scattering in Standard Single-Mode Fibers
Authors: Diamandi Hilel Hagai , Bashan Gil , London Yosef , Shemer Keren , Sharma Kavita , Zehavi Elad , Zadok Avi
Published: January 2022

Torsional-radial guided acoustic modes in standard single-mode fibers are stimulated by pump tones of linear and orthogonal polarizations. The same acoustic modes induce photo-elastic birefringence. Circularly polarized pump waves can generate acoustic vortex beams.
Nonlinear Optical Trapping Dynamics Studied with Simultaneous Spatial and Temporal Resolution
Authors: Devi Anita , Yadav Sumit , De Arijit Kumar
Published: January 2022

By simultaneously detecting backscatter signal and recording bright-field video-microscopy, we spatiotemporally track optical trapping dynamics of dielectric micro-particles in a nonlinear laser trap generated by high-repetition-rate femtosecond pulse-train.
Two Modes of Near-Surface Convective Flows Threshold at Thermal Lens Oscillations
Authors: Bielova A. , Lymar V. , Makovetskyi Ye.
Published: January 2022

A threshold behavior of the convective flows’ excitation in fluid media at thermal lens oscillations is examined. In the case of a local near-interface heating some deformation of the medium surface takes place. Taking into account the latter two modes of a threshold at the convective flows’ excitation is suggested. Their nature differs qualitatively from well-known classical thresholds described by Rayleigh and Marangoni numbers.
Supercontinuum Generation by Saturated χ(2) Interactions
Authors: Jankowski Marc , Langrock Carsten , Desiatov Boris , Lončar Marko , Fejer M. M.
Published: January 2022

We establish a model for supercontinuum generation in dispersion-engineered χ(2) nanowaveguides based on saturated second-harmonic generation, and show that this process exhibits favorable scaling laws when compared to approaches based on χ(3) non- linearities.
All-Optical 40-GHz Switch Using Cascade Nonlinearities in a Quasi-Phase-Matched Lithium Niobate Waveguide
Authors: Fukuchi Yutaka , Maeda Joji
Published: January 2022

Characteristics of an all-optical switch employing a 3-cm-long quasi-phase-matched lithium niobate are investigated through switching experiments considering the temporal widths of the input clock and signal pulses. Stable and efficient 40-GHz operation is successfully demonstrated.
Efficient terahertz generation schemes in thin-film lithium niobate platform
Authors: Yang Jingwei , Wang Cheng
Published: January 2022

We propose two schemes for efficient continuous-wave terahertz generation based on lithium niobate on insulator platform via DFG. The efficiencies are as high as 2.1×10-2 W-1 at 3 THz and 1.2×10-3 W-1 at 300 GHz.
Manipulation of Ultrafast Pulses Using Epsilon-Near-Zero Based Plasmonic Nonlinear Metasurface
Authors: Manukyan Karapet , Alam M. Zahirul , Liu Cong , Pang Kai , Hendrickson Joshua R. , Smith Evan M. , Walker Dennis E. , Vangala Shivashankar , Tur Moshe , Boyd Robert W. , Willner Alan E.
Published: January 2022

We demonstrate self-phase-modulation induced spectral manipulations of 700 fs pulses using an epsilon-near-zero based plasmonic metasurface. We observe an 84% spectral broadening and 47% of FWHM wavelength blueshift.
Probing Ultrafast Transient Electric and Magnetic Fields in Silicon Metasurfaces
Authors: Tiwari Uddhab , Appavoo Kannatassen
Published: January 2022

We conduct ultrafast broadband spectroscopy on an all-dielectric Si metasurface to understand how their nanoscale transient electric and magnetic fields modify dynamically the overall optical resonance response of our system.
Enhanced Nonlinear Response in ENZ Metamaterials Realized Using Metal-Dielectric Multilayer Stacks
Authors: Suresh Sisira , Reshef Orad , Alam M. Zahirul , pham Jeremy U , Karimi Mohammad , Boyd Robert W.
Published: January 2022

We present an epsilon-near-zero metamaterial consisting of a subwavelength periodic stack of metal and dielectric layers with enhanced nonlinear optical response in its zero-permittivity wavelength. This ENZ condition can be tuned by adjusting layer thickness.
Highly Asymmetric Second-Harmonic Generation in a Bianisotropic Metasurface Assisted by Quasi-BICs
Authors: Mobini Ehsan , Alaee Rasoul , Boyd Robert , Dolgaleva Ksenia
Published: January 2022

We theoretically demonstrate that it is possible to obtain several orders of magnitude second-harmonic power difference for the forward and backward illuminations by adjusting geometrical parameters coinciding with quasi-BICs. Our study paves the way towards generation of directional higher-order waves.
Ultralow-frequency ultranarrow-bandwidth coherent terahertz imaging for nondestructive testing of mortar material
Authors: Tokizane Yu , Yamaguchi Takayoshi , Minamikawa Takeo , Hase Eiji , Yamaguchi Kenzo , Suzuki Akihiro , Ueda Takao , Yasui Takeshi
Published: January 2022

Nondestructive testing of concrete materials is essential in civil engineering to maintain social infrastructure such as buildings or bridges. In this study, we constructed an ultralow-frequency, ultranarrow-bandwidth, coherent terahertz (THz) imaging system based on THz time-domain spectroscopy (THz-TDS). Based on its ultralow-frequency-localized THz wave and coherent detection, the present system achieved a wide dynamic range of THz power over 100 dB at 0.046 THz, which is appropriate to measure the mortar material. The achieved dynamic range of the THz power was 59 dB larger than that of a commercialized THz-TDS system and 49 dB larger than that of an ultralow-frequency noncoherent THz imaging system equipped with a high-power electric THz source. Ultimately, the proposed system could visualize the inner structure of a mortar sample with a thickness of 10 mm, and the present system can investigate a mortar sample with a thickness of over 130 mm. The proposed method is an attractive tool for non-destructive testing of thick concrete structures characterized by non-invasiveness and non-contact remoteness.
Optimal weak measurement in the photonic spin Hall effect for arbitrary linear polarization incidence
Authors: Lin Shuai , Hong Jiahao , Chen Zhihao , Chen Yu , Zhou Xinxing
Published: January 2022

The photonic spin Hall effect (SHE) has great potential in precision metrology due to its unique spin modulation characteristics. To improve its potential, the effective enhancement of detection precision has become an important issue. In this work, we theoretically and experimentally demonstrate the optimal weak measurement (optimal overlap of pre-selected and post-selected states) with arbitrary linear polarization incidence for both amplified transverse and in-plane shift. Also, based on photonic SHE, a method for arbitrary linear polarization angle detection is then proposed experimentally with a detection accuracy of 0.04 degree. It can provide a guidance for the weak measurement and enlarge the potential application of photonic SHE in field of precision measurement.
Interfacing Photonics to Free-Space via Large-area Inverse-designed Diffraction Elements and Metasurfaces
Authors: Yulaev Alexander , Zhu Wenqi , Ropp Chad , Westly Daron A. , Simelgor Gregory , Zhang Cheng , Lezec Henri J. , Agrawal Amit , Aksyuk Vladimir A.
Published: January 2022

Large-area inverse-designed photonic gratings and optical metasurfaces directly couple waveguides to wide free-space modes with custom wavefronts and polarizations in the visible and near-infrared. Design, modeling methods and experimental results are discussed.
Deep learning-enhanced, open-source eigenmode expansion
Authors: Hammond Ian M. , Hammond Alec M. , Camacho Ryan M.
Published: January 2022

We present an open-source eigenmode expansion (EME) software package entirely implemented in the Python programming language. Eigenmode expansion Python (EMEPy) utilizes artificial neural networks to reproduce electromagnetic eigenmode field profiles to accelerate the EME process by a factor of 3. EMEPy provides an intuitive scripting interface, is easily compatible with a number of other Python packages, and is useful for educators and new designers.
Nonreciprocal light transmission via optomechanical parametric interactions
Authors: Lan Yan-Ting , Su Wan-Jun , Wu Huaizhi , Li Yong , Zheng Shi-Biao
Published: January 2022

Nonreciprocal transmission of optical or microwave signals is indispensable in various applications involving sensitive measurements. In this paper, we study optomechanically induced directional amplification and isolation in a generic setup including two cavities and two mechanical oscillators by exclusively using blue-sideband drive tones. The input and output ports defined by the two cavity modes are coupled through coherent and dissipative paths mediated by the two mechanical resonators, respectively. By choosing appropriate transfer phases and strengths of the driving fields, either a directional amplifier or an isolator can be implemented at low thermal temperature, and both of them show bi-directional nonreciprocity working at two mirrored frequencies. The nonreciprocal device can potentially be demonstrated by opto- and electromechanical setups in both optical and microwave domains.
Sub-three-cycle pulses at 2 µm from a degenerate optical parametric amplifier
Authors: Keller K. R. , Budweg A. , Allerbeck J. , Brida D.
Published: January 2022

In this work we present a compact two-stage optical parametric amplifier (OPA) pumped at degeneracy by the fundamental of a Yb:KGW laser system. The output pulses span from 1.7 to 2.5 µm (120–176 THz) and are compressed to a sub-20 fs duration. This parametric amplifier exploits the broad phase-matching bandwidth at the degeneracy point in bismuth triborate (BiBO) and periodically poled lithium tantalate (PPLT). The result drastically expands the availability of ultrashort pulses with few-microjoule energy from near-infrared (NIR) to even longer wavelengths in the mid-infrared (MIR) spectral region.
Compressed Raman method combining classification and estimation of spectra with optimized binary filters
Authors: Justel Timothée , Galland Frédéric , Roueff Antoine
Published: January 2022

Compressed Raman methods allow classification between known chemical species with only a few measurements through binary filters. We propose a methodology for binary filter optimization, in which filters are modified at each pixel so that classification can still be achieved pixel by pixel with a few measurements acquired in parallel, while retaining the ability to reconstruct a full spectrum when combining measurements from several pixels. This approach is robust to intensity variations between pixels. It relies on a generalized Bhattacharyya bound and on the Cramér–Rao bound to tailor filters with optimized performance.
Photonic generation of broadband linearly chirped microwave waveform based on a low-loss silicon on-chip spectral shaper
Authors: Sun Yu , Wang Dongyu , Deng Chunyu , Lu Mengjia , Huang Lei , Hu Guohua , Yun Binfeng , Cui Yiping
Published: January 2022

A silicon on-chip spectral shaper based on a Sagnac loop incorporating a chirped multi-mode waveguide Bragg grating (WBG) for linearly chirped microwave waveform generation is fabricated and demonstrated. The transmission spectrum of the spectral shaper displays low insertion loss characteristic due to the application of edge coupling taper and multi-mode waveguide based grating. An up-chirped microwave waveform with bandwidth as large as 44 GHz is generated by mapping the spectrum profile of the spectral shaper to the temporal domain through a dispersion fiber. The instantaneous frequency of the generated signal shows good linearity benefiting from the weak modulation strength in the multi-mode WBG. The low insertion loss performance as well as the low dispersion value required in our design presents feasibility in further integration with on-chip dispersion.
Formation of color solitons and domains in fiber lasers
Authors: Komarov Andrey , Dmitriev Alexander , Komarov Konstantin , Zhao Luming , Sanchez François
Published: January 2022

Using numerical simulation, we have investigated the generation of color solitons consisting of two radiation fragments with different carrier frequencies in a dual-wavelength laser. The proposed mechanism for the formation of such solitons involves nonlinear losses that increase with increasing intensity, the dispersion of the refractive index, spectral gain inhomogeneity, and the generation of a doublet radiation spectrum, owing to the corresponding spectral-dependent losses in the laser. The proposed theory explains the main features of the experimentally observed formation of color domains in fiber lasers and has the potential for further development of methods for controlling the nonlinear dynamics of laser radiation.
Highly tunable birefringent phase-matched second-harmonic generation in an angle-cut lithium niobate-on-insulator ridge waveguide
Authors: Lu Chuanyi , Zhang Yuting , Qiu Jing , Tang Yongzhi , Ding Tingting , Liu Shijie , Zheng Yuanlin , Chen Xianfeng
Published: January 2022

Phase-matched nonlinear wave mixing, e.g., second-harmonic generation (SHG), is crucial for frequency conversion for integrated photonics and applications, where phase matching wavelength tunability in a wide manner is important. Here, we propose and demonstrate a novel design of angle-cut ridge waveguides for SHG on the lithium niobate-on-insulator (LNOI) platform via type-I birefringent phase matching (BPM). The unique strong birefringence of LN is used to achieve flexible temperature tuning. We experimentally demonstrate a normalized BPM conversion efficiency of 2.7%W−1cm−2 in an angle-cut LN ridge waveguide with a thermo tuning slope of 1.06 nm/K at the telecommunication C band. The approach effectively overcomes the spatial walk-off effect and avoids the need for periodic domain engineering. Furthermore, the angle-cut ridge waveguide scheme can be universally extended to other on-chip birefringent platforms where domain engineering is difficult or immature. The approach may open up an avenue for tunable nonlinear frequency conversion on integrated photonics for broad applications.
Retinal blood flow imaging with combined full-field swept-source optical coherence tomography and laser Doppler holography
Authors: Puyo Léo , Spahr Hendrik , Pfäffle Clara , Hüttmann Gereon , Hillmann Dierck
Published: January 2022

Full-field swept-source optical coherence tomography (FF-SS-OCT) and laser Doppler holography (LDH) are two holographic imaging techniques presenting unique capabilities for ophthalmology. We report on interlaced FF-SS-OCT and LDH imaging with a single instrument. Effectively, retinal blood flow and pulsation could be quasi-simultaneously monitored. This instrument holds potential for a wide scope of ophthalmic applications.
Inner mechanism of Pr3+ luminescence thermometers based on the intervalence charge transfer state
Authors: Tang Wei , Zuo Chuandong , Li Yingkui , Ma Chaoyang , Yuan Xuanyi , Cao Yongge , Wen Zicheng
Published: January 2022

Owing to their ultra-high temperature sensitivity, luminescence thermometers based on the intervalence charge transfer state of Pr3+ have drawn more and more attention. But the inner mechanism of Pr3+ luminescence thermometers, especially which parameters could affect the value of relative sensitivity, is still not fully revealed. In this paper, the luminescence thermometer properties of Ba1-xCaxTiO3:1%Pr3+ (x=0-0.7) with variation temperature have been systematically studied. The process of electrons in the 3P0 state passed through the intervalence charge-transfer state to the 1D2 state has been found to be sensitive to temperature variation. Through the intervalence charge transfer state engineering, we successfully realized the effective regulation of the intervalence charge transfer state energy position by replacing Ba2+ with Ca2+ and find that the effective energy gap between the 3P0 state and the intervalence charge transfer state is the key parameter that affects the relative sensitivity of luminescence thermometers. Moreover, the maximum relative sensitivity of Pr3+-doped BaTiO3, evaluated to be 2.26% K−1 at 413K under 450 nm excitation, is the one of the best performances among the Pr3+-based luminescence thermometers. This research could lead to the novel development of an efficient and high-performance optical thermometer.
Design and analysis of an optically transparent ultra-wideband absorber covering C-, X-, ku-, k-, ka- bands
Authors: Hu Xuerong , Wang Yi , Wan Zhaohui , Li You , Li Ronghao , Li Huangyan , Cao Qunsheng
Published: January 2022

In this paper, an optically transparent ultra-wideband electromagnetic absorber (EMA) is designed using indium tin oxide (ITO) film. To achieve a transparent property, the traditional dielectric substrate and copper are replaced by polyethylene terephthalate (PET) and ITO film. The ultra-wideband absorbing is achieved through the combination of multilayer periodic ITO structures etched on flexible PET layers. The simulation results show that the design can absorb EM waves in the frequency range of 3.72-42.42 GHz (relative bandwidth 165.75%), while its overall thickness is only 0.669λ0 (λ0 is the wavelength at the center frequency of EMA). The design also has the property of polarization insensitive and angular stability. Finally, the absorber is fabricated and measured to prove the effectiveness.
Materials and Devices for Engineering of Thermal Light: feature issue introduction
Authors: Xiao Yuzhe , Kats Mikhail A. , Greffet Jean-Jacques , Li Qiang , Papadakis Georgia T.
Published: January 2022

Thermal radiation describes the emission of electromagnetic waves from hot objects. Although the basics of thermal radiation have been well understood for more than a century, engineering of thermal radiation is an active research field, in part because of applications to energy harvesting, lighting, and thermoregulation. The rapidly evolving research base sits at the intersection of materials science, photonics, and thermal physics. In eight research papers and one opinion paper, this feature issue of Optical Materials Express advances the multidisciplinary field of engineering of thermal light.
Quantitative phase imaging using a combination of flat fielding and windowed Fourier filtering demodulated by a graph cuts algorithm for screening opaque and transparent objects
Authors: Ibrahim Dahi Ghareab Abdelsalam
Published: January 2022

In this paper, quantitative phases of opaque and transparent objects are measured precisely using a combination of flat fielding and windowed Fourier filtering demodulated by graph cuts algorithm. The modulated interferogram is corrected first by flat fielding to remove dust particles and adjust inhomogeneity of the interferogram intensity. The corrected interferogram is then convolved by windowed Fourier filtering to produce an interferogram free from speckle noise. The obtained interferogram is reconstructed by the Fourier transform method, or the wavelet method, or the angular spectrum method to extract the wrapping phase of the object. A graph cuts algorithm is used to unwrap the wrapping phase to remove the 2π ambiguity. Experimental results show that quantitative phases of the objects being screened are precisely measured by the proposed method. Moreover, the lateral resolution, which is represented by slope of the roll-off is slightly improved without applications of digital filters. Furthermore, shapes of the echinocytes of the cancerous blood cells which have the sharpest spatial features are seen clearly by the proposed method.