bluuebunny/crossref_metadata_2025 huggingface dataset:
Corneal quality assessment for corneal transplantation using hyperspectral imaging
Authors: Antony Maria Merin , Matham Murukeshan Vadakke
Published: December 2024

Cornea is the most widely transplanted human tissue. To ensure good surgical results and effective visual recovery, thorough screening of donors and donor tissues is necessary throughout the process [1]. This screening minimizes the risk of transmitting infectious diseases and environmental contaminants to the recipient, while also guaranteeing the transplant’s high optical and functional quality. Therefore, the quality assessment of the cornea at various stages - from donor selection to the transplantation procedure is crucial to ensure its longevity and effectiveness.
Multiband Frequency-Tunable Millimeter-Wave Absorber
Authors: Shahzad A. , Ahmed S. , Naqvi Q. A. , Choudhury Pankaj K.
Published: December 2024

The use of wireless electronic devices, such as sensors, radar detectors and cell phones, has resulted in a complex electromagnetic (EM) environment that causes significant EM pollution [1]. To avoid these, absorbers with effective EM attenuation are indispensable [1–3]. Within the context, functional materials and structures having adjustable or adaptive absorption characteristics are of paramount importance to efficiently absorb EM radiation in challenging circumstances [4–6]. Frequency-tunable absorbers are commonly employed in microwave frequency bands. Herein, we present a multiband millimeter-wave absorber comprising a multilayer hybrid structure of graphene-copper-FR4-copper to achieve multiband frequency-tunable millimeter-wave absorption. We emphasize on the theoretical framework, design methodology, and results based on simulations.
Development of Broadband Fiber-Based Frequency Comb Light Sources Using Nonlinearity in a Laser Cavity
Authors: Uchiyama Ryusei , Kokuyama Wataru , Nakajima Yoshiaki
Published: December 2024

Optical frequency combs play a vital role in spectroscopic measurements, serving as an array of continuous-wave (CW) lasers with precisely aligned modes at equidistant frequency intervals across a broadband spectrum. Broadening the spectral bandwidth is essential for conducting precise spectroscopic measurements across various wavelength ranges. A technique for achieving a broadband spectrum directly at the laser direct output has been reported, which involves integrating a nonlinear medium distinct from the gain medium in the laser cavity1. This technique exploits the high optical power stored in the cavity to generate a broadband spectral bandwidth surpassing that of the gain spectrum from 600 to 1350 nm.
Applied spectroscopic measurement and analysis of gases using dual comb spectroscopy
Authors: Takeshi Naoki , Uchiyama Ryusei , Kubota Kousuke , Miyazaki Toshiyuki , Sugiyama Yohei , Hong Feng-Lei , Nakajima Yoshiaki
Published: December 2024

In recent years, laser spectroscopy has been used in a wide range of fields, including environmental science, and industry, owing to its non-contact and remote gas sensing capabilities. Several spectroscopic techniques have been reported for measuring gas temperature and concentration. In particular, Rotational-state Distribution Thermometry(RDT) has demonstrated to date, taking advantage of the broadband and high accuracy of DCS technique1).
Ion Clustering Model of a Highly Er3+-doped ZBLAN Fiber Laser at 2.8 μm
Authors: Lee Ju Han
Published: December 2024

Soft glass-based mid-infrared (MIR) fiber lasers have garnered significant attention in the field of laser technology, owing to their substantial potential for diverse applications such as environmental monitoring, defense countermeasures, and medical uses [7]. A number of investigations on MIR fiber lasers have been conducted using ZBLAN fibers doped with ions such as Er3+, Dy3+, and Ho3+ [8-10]. One issue in high power rare-earth-doped ZBLAN fiber lasers or amplifiers is that the output efficiencies are lower than the theoretically expected quantum limit [11-13].
Fabrication and Characterization of Germanium Monosulfide Field-Effect Transistors
Authors: Zhang Qinqiang , Matsumura Ryo , Tsukagoshi Kazuhito , Fukata Naoki
Published: December 2024

The discovery of graphene stimulates the development of low dimensional materials based functional devices [1]. However, the gapless behaviors of graphene restrain itself for next-generation semiconducting electronics and optoelectronics. The germanium monosulfide (GeS), as one of the newly re-discovered and promising two-dimensional layered semiconductors, has recently emerged. Previously, we have achieved the synthesis of large area germanium monosulfide (GeS). In this abstract, we focus on the fabrication of the GeS field-effect transistors (FETs) and its current-voltage (I-V) characterizations.
Engineering MoSe2 Defects via SHI Irradiation for Improved NH3 Gas Sensing: A DFT Study
Authors: Kushwaha Aditya , Vardhan Shalini , Goel Neeraj
Published: December 2024

Ammonia (NH3) gas, common in agriculture and industry, is toxic and necessitates real-time monitoring due to unreliable odour detection[1]. While two-dimensional (2D) transition metal dichalcogenides (TMDs) offer promising NH3 gas sensor properties due to improved sensitivity, selectivity, and fast response [2]. However, their dense stacking structure limits gas interaction, reducing sensitivity at room temperature. To overcome this, our study presents theoretical findings on utilizing swift heavy ions (SHI) irradiation to induce targeted defects in the MoSe2 lattice [3], thereby enhancing NH3 adsorption and improving sensing performance. Density functional theory (DFT) calculations compared NH3 sensing in pristine MoSe2 and SHI-modified MoSe2 with Se (Se-VAC) and Mo (Mo-VAC) vacancies. Results indicate Se-VAC has higher NH3 sensitivity, suggesting improved sensor performance due to increased surface-to-volume ratio.
High-power and compact terahertz signal sources using resonant tunneling diodes
Authors: Suzuki Safumi
Published: December 2024

The use of terahertz (THz) electromagnetic waves is anticipated for high-capacity communications, sensing, imaging, and spectroscopic analysis. However, the output power of semiconductor THz signal sources remains low, limiting THz applications. Resonant tunneling diodes (RTDs) are promising candidates for THz sources due to their compactness and high-frequency operation [1]. For high-power operation, RTD oscillator arrays have been studied for power combination. Recently, a very high output power of 11.8 mW at 450 GHz was achieved by a 36-element coherent array using mutual injection locking [2]. In addition to power combination using arrays, attempts to increase the output power of a single oscillator have also been conducted. In this presentation, recent studies on high-power RTD THz oscillators will be introduced.
Terahertz spin currents resolved with nanometer spatial resolution
Authors: Wu Xiaojun
Published: December 2024

The ability to generate, detect, and control coherent terahertz (THz) spin currents with femtosecond temporal and nanoscale spatial resolution has significant ramifications. The diffraction limit of concentrated THz radiation, which has a wavelength range of 5 μm-1.5 mm, has impeded the accumulation of nanodomain data of magnetic structures and spintronic dynamics despite its potential benefits. Contemporary spintronic optoelectronic apparatuses with dimensions 100 nm presented a challenge for researchers due to this restriction. In this study, we demonstrate the use of spintronic THz emission nanoscopy (STEN), which allows for the efficient injection and precise coherent detection of ultrafast THz spin currents at the nanoscale. Furthermore, STEN is an effective method that does not require invasion for characterising and etching nanoscale spintronic heterostructures. The cohesive integration of nanophotonics, nanospintronics, and THz-nano technology into a single platform is poised to characterize the spin state at the micro-to-nanoscale density, accelerate the development of high-frequency spintronic optoelectronic nanodevices and other revolutionary technical applications.
3D-printed Packaging for Terahertz Silicon Waveguides
Authors: Ngo Nguyen H. , Gao Weijie , Li Mingxiang , Ichikawa Daiki , Yamada Yoshiharu , Yamane Hidemasa , Murakami Shuichi , Withayachumnankul Withawat , Fujita Masayuki
Published: December 2024

In recent years, the rapid development of terahertz (THz) devices has necessitated the utilization of waveguides for coupling signals to the devices under test. Metallic hollow waveguides have been widely adopted for coupling purposes owing to their high coupling efficiency and compatibility with the equipment. As the frequency approaches 300 GHz and higher, the hollow core’s size shrinks to less than 1 mm, complicating micromachining and gold plating processes and leading to high fabrication costs. With the advancement of additive manufacturing technology, 3D-printed metallic waveguides have been developed with high accuracy and high coupling efficiency [1]. Nevertheless, the optimization of post-process for metallization is required, and hence, increases the finishing complexity. All-dielectric waveguides are featured for their low loss, low dispersion, and flexible design [2,3]. A drawback of this waveguide is the requirement of supporting frames. To address these problems, we propose non–metallic 3D-printed packages for all-silicon waveguides, targeting the WR-3.4 band (220–330 GHz).
Strongly coupled terahertz magnons and chiral phonons in antiferromagnets
Authors: Zhang Qi
Published: December 2024

In quantum materials, collective excitations in the terahertz (THz) regime govern the low-energy responses of ground states to external stimuli, which is crucial in understanding various correlated phenomena. The hybridization of distinct collective modes offers a pathway for coherent manipulation of coupled degrees of freedom and quantum phases. Particularly in antiferromagnets, the strong coupling between angular momentum-carrying spin and lattice excitations, i.e., magnons and chiral phonons, leads to the formation of chiral magnon polarons in the THz regime, exhibiting intriguing novel properties. This presentation showcases the observation of magnon polarons with THz and Raman spectroscopy in antiferromagnetic insulators. We reveal a unique angular momentum-selective hybridization between THz magnons and chiral phonons. Additionally, we report findings of phonon Zeeman splitting and fluctuation-enhanced phonon magnetic moments in a polar antiferromagnet, Fe2Mo3O8, attributed to phonon-(para)magnon interactions.
Negative curvature annulus core fiber for transmission of orbital angular momentum modes in THz regime
Authors: De Ishani , Rastogi Vipul
Published: December 2024

In the electromagnetic spectrum terahertz band lies between microwave and infrared bands. By convention, the terahertz window is generally considered from a frequency range of 0.1 THz to 10 THz. For this terahertz window, the development of sources and detectors has resulted in research interest in low-loss communication channels. Propagation of THz radiation in free space is lossy due to water vapor content. So, designing a guided wave medium, especially fiber, is the need of the hour [1].
Study of c- and m-plane properties of ZnO via terahertz time-domain ellipsometry
Authors: Zhao Zixi , Agulto Verdad C. , Iwamoto Toshiyuki , Kato Kosaku , Yamanoi Kohei , Shimizu Toshihiko , Sarukura Nobuhiko , Fujii Takashi , Fukuda Tsuguo , Yoshimura Masashi , Nakajima Makoto
Published: December 2024

The terahertz region has recently attracted much attention as the next-generation communication (Beyond 5G, 6G) band, meanwhile, material characterization techniques in the terahertz region have also emerged to meet the needs of 6G devices development [1-3]. Currently, the most widely used characterization technique in the THz band is terahertz time-domain spectroscopy (THz-TDS). However, THz-TDS faces challenges in characterizing high carrier density semiconductors and its phase precision needs improvement.
Identification of calcium oxalate hydrates by terahertz spectroscopy
Authors: Zhao Wangxuan , Kobashi Haruto , Agulto Verdad C. , Kato Kosaku , Maruyama Mihoko , Takahashi Masae , Tanaka Yutaro , Mori Yusuke , Yoshimura Masashi , Nakajima Makoto
Published: December 2024

Although kidney stones come in various types, approximately 80% are composed of either calcium oxalate or phosphate [1]. Calcium oxalate, the primary component of kidney stones, undergoes a phase transition from calcium oxalate dihydrate (COD) to calcium oxalate monohydrate (COM) during the stone formation process. Therefore, analyzing stone components is crucial for both diagnosis and subsequent treatment strategies for urolithiasis.
Spectroscopic Investigation of Physico-Chemical Characteristics of Rice Varieties
Authors: Karnati Manikanth , Rebello Adline S. , B Nandana , Govindaraju Indira , AS Bharath Prasad , Mazumder Nirmal
Published: December 2024

Rice (Oryza sativa L.), a versatile grain, is a dietary staple enjoyed worldwide, cherished for its culinary adaptability and nutritional richness. Its widespread consumption underscores its integral role in diverse cuisines and as a vital source of sustenance for countless cultures. As a significant source of carbohydrates, rice production has been rising, reaching 510.6 million tonnes in 2017 (FAO, 2018) Starch, a prevalent carbohydrate in rice, comprises two primary constituents: amylose and 85 amylopectin. Long linear chains with limited branching characterize amylose, whereas amylopectin consists of shorter chains with numerous branches, resulting in a complex three-dimensional structure. This structural complexity confers a semi-crystalline nature upon starch granules, attributed to the formation of double-helices by short amylopectin chains
Development of Four Channel based Stokes-Mueller Polarimetry Integrated with Machine Learning for Characterization and Classification of Ductal Carcinoma Tissue
Authors: U Spandana K , Melanthota Sindhoora Kaniyala , U Raghavendra , Rai Sharada , Mahato K K , Mazumder Nirmal
Published: December 2024

This study presents a Stokes-Mueller polarimetry based imaging system for tissue characterization, specifically for distinguishing normal from cancer regions in ductal carcinoma samples. The fibrous structures present in the tissue enhances the contrast through the measurement of polarization signal, making it easier to analyze images in detail and higher classification accuracy [1].
Broadband Optical Frequency Comb Generation by Employing dual lasers with Dual-Drive Mach Zehnder modulator and Frequency Modulator
Authors: Verma Priyanka , Singh Sukhbir
Published: December 2024

Currently, there is a high demand for communication networks that provide large bandwidth and high efficiency without any interference for various users. One of the traditional ways to increase spectral efficiency is to use individual laser sources. To overcome these issues, optical frequency comb (OFC) [1] has emerged as a popular and effective approach that can improve spectral gain and reduce unwanted interference in communication systems. Researchers find optical frequency combs interesting because of their numerous applications such as precise optoelectronics instrumentation, ultra-short pulse generation [2] and dense wavelength division multiplexing (DWDM)[3] in optical communication networks [4]. In this manuscript an approach is designed for generation of broadband optical frequency comb (OFC) which is characterized by various parameters of laser sources, Dual-drive Mach Zehnder modulator (DD-MZM) and frequency modulator (FM). This approach is effective to achieve 159 optical comb lines with bandwidth of 541 GHz. The generated setup performance is analyzed by optical spectrum analyzer (OSA).
Closed-form solutions in Lugiato-Lefever Equation for Frequency Comb Applications
Authors: Bhatia Sanjana , Kumar C. N.
Published: December 2024

In this study, we explore solitary wave solutions of the ac-driven nonlinear Schrodinger equation also known as Lugiato-Lefever Equation supported by localized gain-loss. By modifying the master equation to incorporate distributive loss, we derive exact analytical solutions for both localized and wave-train patterns, considering cases with trivial and non-trivial chirping. Our findings enhance the theoretical framework for dissipative solitons, revealing significant potential for real-world applications in high-capacity telecommunications and optical frequency combs. This work contributes to the precise control and design of nonlinear optical systems, advancing the understanding of Kerr-frequency comb dynamics.
A Numerical Study on the Sensing Characteristics of Raman-Induced Frequency Shift
Authors: Roy Protik , Chaudhuri Partha Roy
Published: December 2024

We present here an analysis of the sensing properties associated with the Raman-induced frequency shift (RIFS). By employing a conventional step index chalcogenide fiber and utilizing the thermo-optic properties of the material, we investigate the temperature-sensing capabilities facilitated by RIFS.
High-speed atomic force microscopy combined with optical vortex for in-situ real-time observation of twisting azo-polymer
Authors: Kojimoto Kota , Tamura Rihito , Chan Feng-Yueh , Yang Keishi , Uchihashi Takayuki , Verma Prabhat , Omatsu Takashige , Umakoshi Takayuki
Published: December 2024

An azo-polymer film is a photoactive material forming unique surface reliefs through photoisomerization reactions under light irradiation, which is promising for various optical applications such as optical memory. Moreover, by irradiating the azo-polymer film with optical vortex, a complex twisting structure was formed due to the orbital angular momentum of optical vortex[1]. However, the deformation dynamics and mechanisms have not been fully elucidated.
Electron Dynamics of Ultrafast Vector Vortex Laser Irradiation
Authors: Zhang Jiaming , Morita Ken , Agulto Verdad C. , Kato Kosaku , Nakajima Makoto
Published: December 2024

The dynamical effects of lasers have garnered widespread attention, holding significant research value in fields such as optical tweezers (optical trapping), laser processing, and photonic nanojets [1,2]. Studies related to optical dynamical effects primarily focus on dielectric materials [3,4]. On the other hand, research on interactions between optical light and single-charged electrons is mainly focused on the conduction electron excitations in the semiconductors involving the quantum transitions, leaving their dynamics insufficiently explored. Recently, we reported an experiment using ultrafast lasers to observe electron relativistic effects [5], demonstrating the enormous potential of optoelectronic interactions. Studying the dynamic effects of lasers on electrons in free carriers in simple materials rather than in dielectric materials, which are assemblies of dipoles, provides a deeper understanding of the dynamics of lasers and the photon-electron interactions.
Femtosecond Regime Photon Echo with Quantum Dots Evaluated by Up-conversion Single-photon Detector
Authors: Kochi Yuta , Kurimura Sunao , Akahane Kouichi , Ishi-Hayase Junko
Published: December 2024

Recently, quantum information processing and communications using photons have been attracting attention. To increase the density of transmitted photonic qubits, it is necessary to develop broadband quantum memories and detectors that can handle ultrashort pulses. Although rare-earth-ion doped quantum memories [1] have been widely studied, due to their storage bandwidth of ~GHz, they are incapable of storing ultrashort pulses. In our group, we used the photon echo (PE) method with quantum dots (QDs) to realize ultra-short femtosecond pulse storage. However, we encountered many difficulties in realizing this method such as low PE efficiency from the QDs and the insufficient temporal resolution of the avalanche single-photon detectors. To solve these problems, we have applied a new quantum control method and utilized an up-conversion single-photon detector (UCSPD) [2]. In this presentation, we will introduce the techniques “1. Time-resolving measurement by UCSPD,” “2. PE quantum memory using QDs” and “3. enhancement of PE signals.”
Spectral resolution of quantum Fourier transform infrared spectroscopy using pulsed laser excitation
Authors: Kaur Jasleen , Mukai Yu , Okamoto Ryo , Takeuchi Shigeki
Published: December 2024

In recent years, nonlinear quantum interferometry has been widely explored for applications like spectroscopy, optical coherence tomography, and imaging [1]. Quantum infrared spectroscopy (QIRS) uses quantum interference of generation processes of frequency-entangled visible-IR photon pairs to perform infrared spectroscopy using visible light sources and silicon-based detectors [2]. This technique utilizes a nonlinear quantum interferometer configuration where the generated IR photons pass through the sample, and the correlated visible photons are detected. The change in the detected visible photon flux with and without the sample helps extract the complex transmittance of the sample in the IR region.
3D Images of Oxygenation by Near-infrared Optical Tomography: State and Prospects
Authors: Wolf Martin
Published: December 2024

This is an overview of the current state of near infrared optical tomography, an optical method to generate 3D images of tissue. Since it images the oxygenation of tissue, it is of high clinical relevance.
Silicon Nitride Platform for Integrated Photonic Circuits Applied to Quantum Technologies
Authors: Garay-Palmett K. , Domínguez-Serna F. , Castro F. , Romero-Castro J. , Aguayo-Alvarado A. L. , Casillas N. , Salas-Montiel R. , De La Cruz W.
Published: December 2024

This work presents advances in developing photonic circuits, proposed on an integrated silicon nitride platform, for applications in quantum technologies. Among other functionalities, these devices are designed to generate and control quantum states of light.
Tabletop Automated TCSPS Measurement System for Characterizing Single-Photon Emitters
Authors: Lagutchev Alexei S. , Bogdanov Simeon I. , Boltasseva Alexandra , Shalaev Vladimir M.
Published: December 2024

We report on a table-top system for characterizing single photon emitter fluorescence lifetimes, spectra, photon correlation and spin properties. Measurements are facilitated by automation and machine learning.
Tailoring attosecond pulse trains generated by intense femtosecond two-color fields
Authors: Olsson T. , Medlin W. , Chumley S. , Davis J. , Wicklund C. , Laurent G. M.
Published: December 2024

We show how the temporal profile of attosecond pulses generated by two–color femtosecond fields can be tuned by varying both the intensity ratio and the relative phase between the two components of the field.
Holographic multiplexing of orbital angular momentum states in a photorefractive crystal
Authors: Navarro Angie L. S. , Moreno Y. Torres , Chávez-Cerda S.
Published: December 2024

We present the recording and simultaneous readout of two holograms of Orbital Angular Momentum states with topological charges m1 = 5 and m2= 15 in a photorefractive crystal. The principle of holographic multiplexing has been demonstrated experimentally.
Photoacoustic Thermometry with Endogenous and Exogeneous Contrast
Authors: Kosik Ivan , Weersink Robert , Wilson Brian
Published: December 2024

Photoacoustic thermometry (PT) is an attractive thermal therapy guidance method due to potentially simple handheld operation, deep tissue penetration and low cost. Here we characterize the capabilities of a new PT system using tissue mimicking phantoms and ex-vivo tissue during photothermal therapy.
A Cost-Effective and Noninvasive Method for Measuring Cell Viability in Candida tropicalis Based on Laser Speckle Imaging
Authors: Loaiza-Tozcuento David , Perez-Corona C.E. , Spezzia-Mazzoco Teresita , Padilla-Martinez Juan Pablo , Ramirez-San-Juan Julio C.
Published: December 2024

Cell viability measurement is crucial in biology and medicine. This work proposes a Laser Speckle Technique, showing high correlation with the MTT assay but offering lower cost, non-invasive, and faster results.
Diphenylalanine Micro/nanotubes in PDMS Microchannels: Unidirectionality and Optical Properties
Authors: Carlos Giovana Bonano , Bandeira Carla Carolina Silva , Martinho Herculano da Silva
Published: December 2024

Diphenylalanine micro/nanotubes were prepared in PDMS polymer microchannels with and without an electric field. The goal is to develop microfluidic platforms for biomedical applications.
Anomalous strong coupling of asymmetric porous silicon microcavity with CdSeS/ZnS quantum dots
Authors: Guerrero Salvador Escobar , Nava Rocío , Reyes-Esqueda Jorge-Alejandro
Published: December 2024

Exciton-polariton formation with a complex coupling constant and emission enhancement by the Purcell effect was obtained for asymmetric porous silicon microcavities strongly coupled with CdSeS/ZnS quantum dots.
Time stability of a fiber optic sensor for pH detection
Authors: Megchum-Ruedas Carlos Alberto , Velasco-Bolom Pedro Marcos , Grajales-Coutiño Rubén , Camas-Anzueto Jorge Luis , Meza-Gordillo Rocío
Published: December 2024

In this work, PEDOT:PSS/PVA was studied as an optical fiber coating for pH detection in the range of 1-7, showing a response in that range and high stability for approximately 10 minutes.
Pattern recognition algorithm based on interferometric signal vectorization
Authors: Martínez-Guerrero María , Esquivel Jonathan , Martínez-Manuel Rodolfo , Valentín-Coronado Luis M. , Diaz Silvia , Armendáriz Miguel Ángel
Published: December 2024

A pattern recognition algorithm for interferometric signals is presented. Using a database of vectorized reference signals, the measured signal is identified based on the similarity obtained through the dot product operation.
Temperature-dependent polarization rotation in thermochromic materials
Authors: Fong-González Ariel , Camas-Anzueto Jorge Luis , Grajales-Coutiño Rubén
Published: December 2024

In this work we present the analysis of the rotation of the polarization of light through samples of a thermochromic material, by using the Malus law and the intensity of light transmitted by the samples.
Large photon number semiclassical asymptotics of the HOM interferometer with partially indistinguishable photons
Authors: Villalobos Miguel , Valencia Alejandra , Botero Alonso
Published: December 2024

The classical correspondence of the HOM interferometer with n → ∞ partially indistinguishable photons is shown to arise from a concentration phenomenon of the quantum state in a Hilbert-space sector that can be associated with a well-defined macroscopic fraction of effectively indisistinguishable photons.
Mid-Infrared (Bio)Photonics: From Emerging Technology to Enabling Devices
Authors: Mizaikoff Boris
Published: December 2024

Vibrational spectroscopies - and especially infrared spectroscopy - play an increasingly important role in modern biodiagnostics, environmental analysis, and food safety/quality scenarios. This has led to the evolution of mid-infrared photonics from an emerging tool into an enabling technology. With applications ranging from non-invasive exhaled breath analysis to in-vivo assessment of cartilage damage, mid-infrared (MIR; 3-20 μm) photonics ranges among the most flexible molecular sensing platforms nowadays available. In particular, with the emergence of quantum and interband cascade laser technology along with advanced MIR waveguide concepts the on-chip hybridization and/or integration of entire MIR sensing devices is on the horizon ultimately leading to IR-lab-on-chip systems.
Assisted temperature detection based on a Mach-Zehnder interferometer using the Optical Harmonic Vernier Effect
Authors: Guzmán-Cano Cipriano , Hernández-Romano Iván , Martinez-Ramirez Laura G. , Minkovich Vladimir P. , Marrujo-García Sigifredo
Published: December 2024

Using the Optical Harmonic Vernier Effect (i=1) with a simulated reference improved a sensor's temperature sensitivity, up to 56 times (from 0.031 to 1.753 nm/°C).
Tunable passively Q-Switched and Mode-Locked fiber laser at 1.9 µm region using a mixture of Gold nanorods and Polyvinyl Alcohol as a Saturable Absorber
Authors: Varsha  , Das Gautam
Published: December 2024

Demonstrated a tunable Q-switched and mode-locked laser at 1.9 µm band using a Saturable absorber of different amounts. It could generate mode-locked pulses of width 8.7 ns and 8.715 pJ energy.
Violation of the law of conservation of energy in the numerical models of fiber optic laser
Authors: Barmenkov Yuri , Minguela-Gallardo Josué Adin , Muniz-Cánovas Pablo
Published: December 2024

We show that the law of conservation of energy is not always fulfilled in the numerical models of fiber lasers. This statement is based on the study of an analysis of the traveling waves model.
Determination and Compensation of the Induced Error by Divergence Adapter Systems in the Measurement of Convex Surfaces by Ronchi Deflectometry
Authors: Gonzales Franco , Arasa Josep
Published: December 2024

The asymmetries and irregularities (<2%) measured for a reference sphere enables the possibility to determine and compensate the induced error by the divergence adapter systems in the measurement of convex surfaces by Ronchi deflectometry.
Statistical and Spatial Characterization of a Gaussian Schell-Model Source
Authors: Orjuela-Moreno Miguel Angel , Martínez-Ponce Geminiano
Published: December 2024

An optical device to generate a Gaussian Schell-model beam using a rotating optical diffuser to modulate spatial coherence properties is characterized. Speckle contrast was evaluated with the aim of identifying optimal settings for imaging applications. Besides, fringe visibility of first-order interference as a function of double-slit position was used to find out the degree of spatial coherence.
Thermo-optical characterization of a new imidazole derivative for application in fiber optic sensors
Authors: Velasco-Bolom Pedro Marcos , Camas-Anzueto Jorge Luis , Pérez-Patricio Madaín , Gómez-Pérez Joel , Ramírez-Morales Marcoantonio
Published: December 2024

In this work, a new imidazole derivative is characterized in a 30° to 65 °C temperature range. It shows thermochromic properties in its absorption spectrum to be used in manufacturing fiber optic sensors.
Semi-Supervised Adaptation of a Channelized Quadratic Observer
Authors: Talwar Uday , Jalilzadeh Afrooz , Kupinski Meredith
Published: December 2024

Binary classification of high-dimensional, low-sample-size datasets is feasible with channelized quadratic observers. Channel solutions can be optimized iteratively. A semi-supervised extension is developed for unlabeled data with smaller quantities of labeled data.
Experimental Study of Sagnac Interferometer with Strict Polarization Controlled to Clean Amplified Optical Signals
Authors: de la Cruz González José , Ruiz Diego Hernandez , Rio Sarah Naomi Alvares del , Núñez Jorge Luis Flores , Hernández Héctor Santiago , de Jesús Mora Nuñez Azael , Bravo Medina Manuel S. B. , González Anuar Benjamín Beltran , Pottiez. Olivier J. M.
Published: December 2024

We study the transmission of the Optical Fiber Sagnac Interferometer (OFSI) with strict polarization control to clean signals amplified by an Erbuimm doped fiber amplifier. The signal and noise were amplified. However, the temporal show that OFSI adjusted at maximum transmission can filter the noise of low radiation.
Low Pressure Measurements with a Fabry-Perot Interferometer
Authors: Calixto Sergio , Zitzumbo Roberto , Malacara-Hernandes Zacarias
Published: December 2024

Here is presented the application of the Fabry-Perot interferometer to measure low pressures in the order of tens of Pascals. The fabrication of the interferometer and the method to make the measurements is described.
Ultraviolet Radiation - C: Promising Optical Technique in the Decontamination of Organs for Transplantation
Authors: Goenaga-Mafud L. C. , Vollet-Filho J. D. , Inada N. M. , Kurachi C. , Bagnato V. S.
Published: December 2024

At present, there is a pursuit to increase the availability of organs for transplantation. Here, it is demonstrated that UV-C during the organ infusion process reduces the bacterial load of the organ.
Radiobiological Effects in the Tumour Blood Microcirculation During High-Dose Radiation Therapy Imaged with Optical Coherence Tomography
Authors: Contreras-Sánchez Héctor A. , Zabel W. Jeffrey , Taylor Edward , Vitkin Alex
Published: December 2024

In radiotherapy, the use of high doses of radiation for treating cancer is suggested to cause microvascular injuries that possibly enhance tumour cell death. Optical Coherence Tomography may assist in revealing these little-known radiobiological effects.
Estimation and Comparison of Brainstem Fiber Orientation Via Diffusion MRI Tractography and Polarization Sensitive OCT
Authors: Aguilera-Cuenca Isabella , Hutchinson Elizabeth , Sawyer Travis
Published: December 2024

dMRI-based tractography methods reconstruct neural pathways but often lack detailed microstructural information. This study compares fiber orientation distributions in the human brainstem obtained through Constrained Spherical Deconvolution Tractography and polarization-sensitive OCT.
Non-Hermitian Zigzag Glauber Lattice
Authors: Fahara-Ojeda G.S. , Villegas-Martínez B.M. , Sánchez-Mondragón J.J. , Gesing S. , Battelle T. , Neto A.F. , Bocanegra-Garay I.A. , Licea-Rodriguez J. , Beltrán-Vargas R.A. , Escobedo-Alatorre J.J.
Published: December 2024

A non-unitary transformation is applied to a non-Hermitian zigzag waveguide array, resulting in Hermitian dynamics that describe a reciprocal waveguide system. A comparison between the exact and numerical solution is performed.
Laguerre-Gaussian Beam Transmission through a Hyperbolic Metamaterial
Authors: Fesenko Volodymyr , Shulika Oleksiy , Tuz Vladimir R.
Published: December 2024

The interaction of a three-dimensional Laguerre-Gaussian beam with a hyperbolic metamaterial is considered. Conditions are found at which the Laguerre-Gaussian beam can be transmitted through the metamaterial almost without any distortion.
A Hybrid Convolutional Neural Network for Classification and SNR Estimation of QAM Modulation Formats
Authors: Herrera J. , Núñez-Kasaneva J. , Pereda N. , Alvarado A. , Saavedra G.
Published: December 2024

A hybrid convolutional neural network to identify modulation format and estimate signal-to-noise ratio (SNR) using received constellations is shown. Accuracy of 91.38% and average error of 0.83 [dB] are shown estimating modulation format and SNR.
Characterization of Transverse Light-Drag in Hot Atomic Vapors Using Zeeman EIT
Authors: Arroyo-Rivera E. Samuel , Nguyen Long , Boyd Robert W.
Published: December 2024

Light undergoes drag when it travels through a moving medium. In this work, we study transverse drag between a moving light source and a stationary slow-light medium using non-degenerate Zeeman Electromagnetically Induced Transparency (EIT).
Desing a High-Precision Power Stability Drive System for DFB Diode Laser
Authors: León-Lizárraga G. , Camas-Anzueto J. L. , Pérez-García G. F. , Grajales-Coutiño R. , Mota-Grajales R. , León-Orozco V.
Published: December 2024

The proposal introduces a DFB laser diode, a significant advancement in the field of optoelectronics. The design of an optoelectronics system to stabilize the optical power of the laser diode, feedback-controlled by an internal photodiode, is a crucial development that will greatly impact the field. .
A Rapid Method for Ag85B Detection of Tuberculosis Using Label-Free Biosensor Based on an E-SMS Optical Fiber Structure
Authors: Patiño-Jurado Brayan , Gaviria-Calderón Arturo , Moncada-Barrera Manuel S. , Cardona-Maya Yamile , Jaramillo-Grajales Marisol , Montagut-Ferizzola Y. J. , Botero-Cadavid Juan F.
Published: December 2024

In this work, etched singlemode-multimode-singlemode (E-SMS) optical fiber structures are evaluated as a biosensor through the binding between the immobilized recombinant Ag85B antigen and anti-Ag85B antibody. By tracking the wavelength response, it is demonstrated that the E-SMS devices can detect and measure low concentrations of anti-Ag85B in PBS solutions. This sensitive label-free biosensing technology for Ag85B protein detection has the potential to be applied for the detection of Mycobacterium tuberculosis and its evolution in clinical diagnosis as an alternative to the standard methods.
Multichannel Polarization Fiber Optic Sensors Using Wavelength Multiplexing
Authors: Kyselak Martin , Vylezich Zdenek , Vavra Jiri , Grenar David , Slavicek Karel
Published: December 2024

A novel approach for multichannel polarization fiber optic sensors using wavelength multiplexing. By exploiting the unique properties of polarization and multiplexing techniques, our system achieves enhanced sensitivity and robustness for various sensing applications.
Detection of Gases at the Molecular Level
Authors: Varsha  , Trevisanutto Joshua O. , Das Gautam
Published: December 2024

Developing a low-power device using intracavity laser absorption spectroscopy to measure gases (e.g., ammonia) emitted from fertilized fields. An inventory of these gases will minimize the application of fertilizers and help to combat climate change.
Estimation of Thermo-Optical Coefficient with Hilbert Transform in Multiparametric Fiber Refractometer
Authors: Esquivel-Hernández Jonathan , Martínez-Manuel Rodolfo , Valentín-Coronado Luis M. , Maldonado-Hurtado Daniel , Barrera David , Sales Salvador
Published: December 2024

This study demonstrates the use of the Hilbert transform in fiber refractometers to estimate the thermo-optical coefficient from temperature and refractive index changes, achieving a novel approach with low standard deviation for optical applications.
Ince-Gauss Beams in Phase Space
Authors: Gutiérrez-Vega Julio C. , Domínguez-Cruz Agustín
Published: December 2024

We discuss the propagation properties of the Wigner distribution function of the Ince-Gauss beams. This function can be expressed as a finite double summation of products of Laguerre-Gaussian fields.
Propagation of Bessel beams in lenslike media
Authors: Bravo-Cassab P. , Gómez-Correa J. E. , Chávez-Cerda S.
Published: December 2024

We study the propagation of Bessel beams in inhomogeneous lenslike media with a quadratic gradient index through the observation of the shadows caused by the obstruction of the wave field.
Holographic Recording and Diffraction Features of Vector Vortex Gratings
Authors: Medina-Espíritu Dixie L. , Rodríguez-González Rosa Julia , Martínez-Ponce Geminiano
Published: December 2024

Holographic vector vortex gratings are inscribed by the superposition of two orthogonal vector vortex beams subtending a small angle with respect to the normal vector of the photoanisotropic recording medium. The recording medium herein chosen, a side-chain azobenzene-containing polymer film, allows the recording of linear and circular birefringence. Numerical simulations pave the way to obtain a faithful-recording of the resulting field when radial and azimuthal linearly polarized beams are superimposed. When the vector hologram is illuminated with a radial (azimuthal) linearly polarized beam, the diffracted field is the complementary.
Impact of Functional Occlusion Test Protocol on Muscle Oxygenation During Reactive Hyperemia
Authors: Dvekar Vanja , DeVos Leah , Saiko Gennadi , Douplik Alexandre
Published: December 2024

This research explores effects of arterial occlusion protocols on muscle oxygenation, comparing two pressures (150 vs 200 mmHg) and cuff positions (wrist vs upper arm). Cuff position differences were statistically significant; pressure comparisons were not.
Influence of Arterial Occlusion at Various Cuff Pressures on Systemic Circulation Measured by rPPG
Authors: DeVos Leah , Dvekar Vanja , Saiko Guennadi , Douplik Alexandre
Published: December 2024

This study uses remote photoplethysmography (rPPG) to investigate systemic physiological responses to occlusion and reperfusion at different pressure cuff positions. We aim to characterize hemodynamic disturbances from varying occlusion positions by analyzing skin microcirculation during occlusion.
Identification of structured optical fibers with adequate sensitivity and range for displacement sensors in structural health monitoring applications
Authors: Guillen-Ruiz Luis E. , Camas-Anzueto Jorge Luis , Anzueto-Sánchez Gilberto , Perez Joel Gómez
Published: December 2024

A displacement sensor with a centimeter resolution based on structured optical fibers is presented. A toroid-shaped transducer achieved ranges greater than 15 cm with sensitivities of up to 103.3 nW/cm.
Development and Experimental Analysis of a Metal-filled Side-hole Photonic Crystal Fiber-based WGM Temperature Sensor
Authors: Reyes-Vera Erick , Munoz-Hernandez T. , Gonzalez-Valencia Esteban , Valencia-Garzon Sebastian , Torres Pedro
Published: December 2024

The development and experimental analysis of a WGM temperature sensor using a Bismuth-filled side-hole PCF microresonator is reported. The sensor exhibits a sensitivity of 17.14 pm/°C, maintaining a nearly constant Q-factor from 25°C to 61°C.
Comparison of two fixation methods in automated pollen classification on whole slide images
Authors: Cugmas Blaž , Štruc Eva , Tamosiunas Mindaugas , Goldberga Laura , Bērziņa Inese , Kadiķis Roberts , Ivanovs Maksims , Warshaneyan Swarn Singh , Naglič Peter
Published: December 2024

We compared automated MobileNet V3 Large-based pollen classification accuracy on whole slide images. Pollen fixation to microscope slides with silicone achieved higher median accuracy (78.7%) than the standard adhesive tape-based fixation (68.9%).
Initial conditions retrieving through Fourier analysis in a rotating retarder Stokes polarimeter
Authors: Herrera-Hernandez Luis , Rodríguez-Cortés Oscar I. , Mora-Núñez Azael , Hernández-Rodríguez Juan , Santiago-Hernández Héctor , Bravo-Medina Beethoven , Beltran-González Anuar , Martínez-Ponce Geminiano
Published: December 2024

A Fourier analysis-based method to determine the arbitrary initial orientation angles of anisotropic optical elements comprised in a Stokes polarimeter is presented. Using these data, the four Stokes parameters of incident polarized light are retrieved.
Plasmonic Metasurfaces and Metamaterials for Color Generation
Authors: Coello Victor , Peña-Gomar Marycarmen , Garcia-Ortiz Cesar E.
Published: December 2024

Plasmonic coloring utilizes microscopically structured surfaces for selective light manipulation. We explore laser-induced color writing using a Ti-Sapphire laser, analyzed via two-photon luminescence microscopy, to enhance sustainable, CMOS-compatible plasmonic materials.
Analysis of the Fluorescent Properties of Lophine - Bi (NO3)3 for generating Warm White Light
Authors: Morales Marcoantonio Ramírez , Anzueto Jorge Luis Camas , Cautiño Rubén Grajales , Velasco Bolom Pedro Marcos , Megchum Ruedas Carlos Alberto , Patricio Madaín Pérez , Gutiérrez Carlos Hernández
Published: December 2024

We characterized bismuth nitrate-lophine solid membranes. The nitration of the metal salt and the aromatic group of lophine exhibit fluorescent properties, making these membranes interesting for generating warm white light.
A Novel Approach to Biofilm Analysis: Laser Speckle Imaging and Haralick Descriptors
Authors: Garcia-Cruz Froylan , Loaiza-Tozcuento David , Perez-Corona C. E. , Spezzia-Mazzocco Teresita , Peregrina-Barreto Hayde , Ramiez-San-Juan Julio C.
Published: December 2024

This study uses Laser Speckle imaging and Haralick descriptors to analyze biofilm dynamics under varying DMSO concentrations. Results show increased sample stability and uniformity, highlighting LS as a non-invasive, cost-effective alternative for cell viability assessment.
Repeatability of quantitative characteristics in sweet orange through mixed-model methodology
Authors: da Costa Capistrano Márcia , Silva de Brito Rychaellen , De Carvalho Andrade Neto Romeu , Borges dos Santos Vanderley , Saraiva Lessa Lauro , Deon Vilela de Resende Marcos , De Lima Gurgel Fábio
Published: December 2024

The objective was to estimate the repeatability coefficient of quantitative traits in multiple harvests of sweet orange, in order to infer the minimum number of evaluations necessary to identify superior genotypes of orange trees through the methodology of mixed models. The experiment was conducted in randomized blocks containing 55 sweet orange genotypes and three replications. The repeatability coefficients were estimated using the maximum residual likelihood method (REML) and the prediction of genotypic values using the best unbiased linear predictor (BLUP). The Selegen software was used to perform the statistical analysis. The average heritability of genotypes in eight seasons, individual and eight seasons repeatability, selection accuracy in one and eight seasons, repeatability determination coefficient, accuracy of permanent phenotypic values based on M years of assessment and efficiency of M assessments compared to situation where only one assessment is carried out. The predictive accuracy of the selection revealed a significant degree of certainty in the inferences made. Evaluation over six seasons can increase accuracy to 70% in selecting sweet orange genotypes for yield-related traits. For the prediction of average fruit mass, seven harvests are enough to obtain 80% accuracy.
Tomato growth submitted to different soil water conditions using biostimulants
Authors: Peripolli Mariane , Sgarbossa Jaqueline , Diel Maria Inês , Bolzan Morais Tassiane , Müller Érika Nogueira , Pivetta Maicon
Published: December 2024

Stress caused by water deficit is the main factor that decreases the productivity and quality of agricultural products. The objective of this study was to describe the morphological components of tomato plants subjected to different soil water conditions, as well as elucidate the use of the Seed+ and Crop+ biostimulants as an alternative to mitigate the effects of water deficit. The experiment was conducted in a completely randomized design with 12 treatments: control; Seed+; Seed+ + Crop+ 1x; Seed+ + Crop+ 2x; Crop+ 1x; Crop+ 2x, in soil water conditions at 50% and 100% soil water retention capacity (WRC). The plant height, leaf width and length, and stem diameter variables referring to the plants were assessed under both soil water conditions and by applying biostimulants. Data were organized and adjusted to the non-linear logistic regression model in order to describe the growth of tomato plants of the Santa Cruz Kada cultivar, which proved to be adequate to describe the growth and showed the best fit; in addition, the use of the Seed+ and Crop+ biostimulants helped in the morphology of tomato plants in both water conditions and reduced the damages caused by water deficit.