bluuebunny/crossref_metadata_2025 huggingface dataset:
Hierarchically patterned protein scaffolds with nano-fibrillar and micro-lamellar structures modulate neural stem cell homing and promote neuronal differentiation
Authors: Hu Jiaqi , Li Chenlin , Yang Zhangze , Wu Qi , Wang Jie , Xu Zongpu , Chen Yuyin , Wan Quan , Shuai Yajun , Yang Shuxu , Yang Mingying
Published: October 2023

This silk fibroin/graphene oxide-based scaffold with nano-fibrillar and micro-lamellar structures can effectively promote cell migration, adhesion, and proliferation, facilitating the differentiation of neural stem cells into neurons.
A unique binding mode of P1′ Leu-containing target sequences for Streptococcus pyogenes sortase A results in alternative cleavage
Authors: Vogel Brandon A. , Blount Jadon M. , Kodama Hanna M. , Goodwin-Rice Noah J. , Andaluz Devin J. , Jackson Sophie N. , Antos John M. , Amacher Jeanine F.
Published: October 2023

Vogel et al. reveals the stereochemical basis of alternative substrate cleavage by S. pyogenes SrtA for ligands with a P1′ Leu residue. The substrate adopts puckered alternative binding, whereby cleavage occurs between the P1′ and P2′ positions.
Interface plasmon damping in the Cd33Se33/Ti2C MXene heterostructure
Authors: Mokkath Junais Habeeb
Published: October 2023

Energy band diagram and transition contribution map of the Cd33Se33/Ti2C heterostructure.
Exploring the effect of C6H5−x/FxBr (x = 0–3) passivating agent on surface properties at different termination ends: first principles
Authors: Chen Changcheng , Cai Yan , Zhang Yirui , Zhang Ziyi , Wang Songya , Gao Shuli , Chen Wen , Guo Shuangna , Abduryim Elyas , Dong Chao , Guan Xiaoning , Liu Ying , Lu Pengfei
Published: October 2023

The influence of passivation molecules with different F atom contents at symmetric positions on different termination ends. The electron, carrier surface migration characteristics and theoretical PCE of MAPbI3@C6H5−x/FxBr (x = 0–3) were studied.
Intramolecular locking and coumarin insertion: a stepwise approach for TADF design
Authors: Paredis S. , Cardeynaels T. , Brebels S. , Deckers J. , Kuila S. , Lathouwers A. , Van Landeghem M. , Vandewal K. , Danos A. , Monkman A. P. , Champagne B. , Maes W.
Published: October 2023

Starting from the known emitter Qx-Ph-DMAC, stepwise modification by coumarin integration and locking of the acceptor affords closer alignment of excited states, leading to improvements in TADF performance and emission efficiency in DBChromQx-DMAC.
The effects of near-surface atomic order on the catalytic properties of Cu3Au and CuAu3 intermetallics for the CO2 reduction reaction
Authors: Verga Lucas G. , Wang Yunzhe , Chakraborty Tanmoy , Da Silva Juarez L. F. , Mueller Tim
Published: October 2023

Density functional theory (DFT) calculations combined with cluster expansions (CE) were employed to explore the catalytic activity of stoichiometric and non-stoichiometric Cu3Au and CuAu3 surfaces for CO2 reduction to CO.
Facile synthesis of surface-functionalized fluorescent carbon quantum dots for the selective detection of ferric ions
Authors: Hijazi Shariqah , Ganie Adil Shafi , Rahman Mohammed M. , Shah Wajaht A.
Published: October 2023

Biomass-derived carbon quantum dots are gaining a lot of attention from contemporary world because of their fascinating physical, chemical and electronic properties which bestowed them excellent water solubility, low cytotoxicity, good biocompatibility and high photostability.
Deoxygenative arylation of secondary amides by merging iridium catalysis with electrochemical radical cross-coupling
Authors: Li Jingan , He Youliang , Jiang Feng , Wang Xiaoming
Published: October 2023

A deoxygenative arylation of amides using aromatic nitriles via merging Ir-catalyzed amide reduction with electrochemistry has been achieved, which may provide an alternative strategy for access to value-added amines from inert amides.
Discovery of carboxyl-containing heteroaryldihydropyrimidine derivatives as novel HBV capsid assembly modulators with significantly improved metabolic stability
Authors: Zhao Shujie , Wang Ya , Zhang Xujie , Qiao Lijun , Wang Shuo , Jin Yu , Wu Shuo , Li Yuhuan , Zhan Peng , Liu Xinyong
Published: October 2023

Novel HBV capsid assembly modulators, 6a-25 and 6b-9, showed significantly improved metabolic stability compared to the lead compound GLS4.
KHA model comprising MoS4and CoFe2O3in engine oil invoking non-similar Darcy–Forchheimer flow with entropy and Cattaneo–Christov heat flux
Authors: Khan Sohail A. , Hayat T. , Alsaedi A.
Published: October 2023

The Newton building in-shooting technique (ND-solve method) was utilized for solution of nonlinear non-dimensional systems.
Recent progress in iron-series-element-based electrocatalysts for Zn–air batteries
Authors: Gao Sanshuang , Wang Xinzhong , Liu Xijun , Guo Cao , Liu Qian , Hu Guangzhi
Published: October 2023

This review has summarized recent iron series elements-based electrocatalysts (ISEEs) progress for Zn–air batteries, and the advantages, challenges, and improvement strategies relating to monometallic, dual, and ternary ISEEs are discussed.
A facile strategy to achieve vitrimer-like elastomer composites with lignin as a renewable bio-filler toward excellent reinforcement and recyclability
Authors: Zhang Ganggang , Tian Chenchen , Chu Heying , Liu Jun , Guo Baochun , Zhang Liqun
Published: October 2023

Vitrimer-like elastomer composites with lignin as a renewable bio-filler, showing effective reinforcement, recyclability and photothermal performance, were prepared.
A dual-mode foam sensor employing Ti3C2Tx/In2O3 composites for NH3 detection with memory function and body movement monitoring for kidney disease diagnosis
Authors: Kan Zitong , Shi Fangyu , Yang Long , Zhou Qingqing , Zhang Yuhong , Qi Yu , Zhang Huan , Dong Biao , Ren Luquan , Song Hongwei , Xu Lin
Published: October 2023

This study investigated a dual-mode sensor with Ti3C2Tx/In2O3 composites on flexible TPU foam for NH3 detection with memory function and pressure sensing for body movement. It enhances the precision of kidney disease detection by monitoring breath and human movement signals in combination.
Gallium-substituted X-type hexagonal ferrites Sr2Co2GaxFe28−xO46: effect of substitution and heating temperature on phase formation and magnetic and dielectric properties
Authors: Patel Ayushi G. , Pullar Robert C. , Meena Sher Singh , Jotania Rajshree B.
Published: October 2023

Polycrystalline X-type hexagonal ferrites are investigated regarding phase formation at different temperatures and the effect of partial substitution of Ga3+ for Fe3+ ions in the octahedral and tetrahedral sites of the unit cell.
Flexibility for Intensity Dosing in Lingual Resistance Exercises: A Large Randomized Clinical Trial in Typically Aging Adults as Proof of Principle
Authors: Szynkiewicz Sarah H. , Drulia Teresa , Griffin Lindsay , Mulheren Rachel , Murray Kelsey L. , Lee Theresa , Kamarunas Erin
Published: October 2023

Objective:

The objective of this study was to determine the effect of intensity dosing during tongue exercise on tongue pressure generation, adherence, and perceived effort.

Design:

This was a five-site, prospective, randomized clinical trial. Outcome measures were obtained across multiple baselines, biweekly during exercise, and 4-weeks post-intervention.

Setting:

The general community at each study site.

Participants:

Typically aging adults between 55–82 years of age with no history of neurological or swallowing disorders. Eighty-four volunteers completed the study.

Interventions:

Participants were randomly assigned to one of four exercise groups: (a) maximum intensity/no biofeedback, (b) progressive intensity/no biofeedback, (c) maximum intensity/biofeedback, and (d) progressive intensity/biofeedback. Half of the participants completed a maintenance exercise program.

Outcome Measures:

Maximum isometric pressure (MIP), regular effort saliva swallow pressure, adherence, and the Borg Rating of Perceived Exertion Scale.

Results:

All exercise protocols were efficacious for gains in MIP (large effect sizes; Cohen's
d
). Group 3 made gains in regular effort saliva swallow pressure (medium effect size). There was a significant change in perceived exertion for regular effort saliva swallow pressure at 8 weeks. Tongue pressure gains were maintained at 1 month, regardless of maintenance group status. Mean adherence across groups was high.

Conclusions:

All groups improved pressure generation. Intensity dosing differences did not affect strength gains, adherence, or detraining. Regular effort saliva swallow pressure may be most responsive to maximum intensity with biofeedback. The findings suggest flexibility in approach to tongue exercise protocols. Tongue muscles may differ from limb muscles in terms of dose response and neuroplasticity principles.
Tri‐layer low‐carbon distributed optimization of integrated energy systems based on hybrid games under stochastic scenarios
Authors: Yue Ziyi , Liu Huazhi , Li Yonggang , Zhong Yuyao , Yao Jiachen , Li Yuxuan
Published: October 2023

The low‐carbon development of integrated energy systems is achieved via the sharing of multiple energy interactions by park‐level IES (PIES).However, coordinating profit distribution conflicts among complex interactive stakeholders in stochastic scenarios is challenging. Accordingly, this study proposes a novel tri‐layer framework that aggregates different game mechanisms to investigate the interactions between PIESs and coupled energy markets. First, a linkage trading mechanism is proposed by integrating carbon emissions trading and green certificate trading, which establishes a coupled electricity‐carbon‐green certificate market. Consequently, a park aggregation operator acts as an intermediary between PIESs and the coupled market, setting upper‐level purchase and sale prices to guide unit generation in each PIES using the Stackelberg game theory. Subsequently, the Nash game theory is applied to realize cooperative bargaining among PIESs for a fair revenue distribution. Further, the impact of uncertain environments is considered by utilizing stochastic scenario methods and the conditional value‐at‐risk theory. To protect the privacy of each participating agent while improving the convergence speed, a differential evolutionary method is combined with analysis target cascading to solve the framework. Finally, the proposed scheduling method is validated by utilizing a typical case to optimize conflicting PIES interests in multiple scenarios and realize decarbonisation.
Adaptive inertia and damping of grid‐connected inverter with improved VSG control
Authors: Ling Zhitao , Liu Yitao , Wang Zhiping , Yin Jian
Published: October 2023

The control technology of virtual synchronization generator (VSG) based on energy storage system is proposed to compensate for the inertia and damping loss caused by the grid connection of distributed generators. However, with the addition of virtual inertia and damping, VSG is prone to generate frequency and power oscillation, and the regulating ability is weakened. For the above problems, this paper analyzes the inertia and damping characteristics of the synchronous motor in the rotation of synchronous motors, and applies artificial neural network control to VSG. In intelligent control strategy, a multi‐input‐output radial basis function (RBF) neural network is first proposed to adaptively adjust virtual inertia and damping. Finally, an experimental platform with a rated power of 1 kW and a variable load of 1 kW was built to validate the proposed control strategy. The experimental results show that the artificial neural network control strategy has a better regulation ability.
Statistical redshift of the very-high-energy blazar S5 0716+714
Authors: Pichel A. , Donzelli C. , Muriel H. , Rovero A. C. , Rosa González D. , Vega O. , Aretxaga I. , Becerra González J. , Terlevich E. , Terlevich R. , Méndez-Abreu J.
Published: October 2023

Context. Blazars are the most numerous class of very-high-energy (VHE; E > 100 GeV) gamma-ray emitters. At present, measured redshifts are available only for about 80% of the VHE gamma-ray sources; this is mainly due to the difficulty in measuring reliable redshifts from their nearly featureless continuum optical spectra.

Aims. As the VHE sky is still vastly unexplored, VHE blazars are unique objects. High-energy spectra from blazars are used for extragalactic background light studies, to investigate topics related to cosmology or fundamental physics, and to find the source luminosity. This allows one to study the properties of the host galaxy, its black hole, and the gamma-ray emission mechanisms. All of these studies require suitable estimations of the blazar distance, which has motivated the use of novel approaches when measuring the redshift of faint optical lines in their spectra is very uncertain.

Methods. We present the new optical spectroscopic observations of S5 0716+714 and its environment taken on December 20, 2019, with the Gemini GMOS North telescope.

Results. We do not find any absorption lines in the blazar spectrum; however, we were able to get the redshifts of 21 other galaxies in the field, 15 of which form a group at z = 0.2304 ± 0.0013. Performing a population study of galaxies, we found that S5 0716+714 belongs to this group with a probability > 99%.
Control of the flow of light in the non-adiabatic regime
Authors: Sheveleva Anastasiia , Leonardo Mathieu , Finot Christophe , Colman Pierre
Published: October 2023

We demonstrate that coupled waveguides systems can be operated in the so called non-adiabatic regime. In this regime, light can undergo transitions between different steady states in a manner analogue to the transition of an electron between energy levels. This approach contrasts with the previous concepts in integrated photonics that rely exclusively on the adiabatic control of the flow of light. We show in particular that abrupt changes of the control parameters are not required to create such non-adiabatic transitions. The constraint for adiabaticity being lifted, light can now be manipulated optimally. And the analogy between the time evolution of a quantum system and the propagation of light in a waveguides array can be pushed one step further.
Adaptive illumination systems with programmable freeform optics?
Authors: Meuret Youri , Cerpentier Jeroen , Rondelez Nick
Published: October 2023

Adaptive illumination systems are capable of changing their emission pattern in a dynamic and flexible manner. Such systems can be realized with tunable optical components. We analyse the possibilities and limitations of phase-only spatial light modulators, implemented as a kind of programmable freeform optics, to realize adaptive illumination systems. First, the calculation of the required phase shift patterns to generate specific target irradiance distributions from arbitrary incident wavefronts, is elaborated. Second, the practical limitations of generating prescribed target patterns are experimentally tested and critically discussed.
CIAO: An on-the-shelf adaptive optics system for astronomers
Authors: Dovillaire Guillaume , Leveder Cora
Published: October 2023

Since 1990, adaptive optics are used in astronomy to remove the effects of atmospheric turbulence, and then retrieve diffraction-limited images, even in bad seeing conditions. Thanks to its strong knowledge in Shack-Hartmann wavefront sensing and deformable mirror, Imagine Optic has developed a simple and affordable adaptive optics system for astronomers. We present the current prototype as well as first experimental results on both natural stars and extended sources, with the main goal of allowing an effective correction in all sky conditions regardless of the object.
Pushing the performance of image scanning microscopy to its limits with maximum likelihood reconstruction
Authors: Garré Giacomo , Zunino Alessandro , Fersini Francesco , Vicidomini Giuseppe
Published: October 2023

Fast and sensitive detector arrays make Image Scanning Microscopy (ISM) the natural successor of confocal microscopy. Indeed, ISM enables super-resolution at an excellent signal-to-noise ratio. Optimizing photon collection requires large detectors and so more out-of-focus light is collected. Nonetheless, the ISM dataset inherently contains information on the axial position of the fluorescence emitters. We exploit such information to directly invert the cmresponding physical model with a maximum-likelihood approach and reassign the signal in the thr ee dimensions, improving the signal-to-background ratio and resolution. We validated our method on synthetic and experimental images; these latter acquired with a custom setup equipped with a single photon avalanche diode array detector. Moreover, our method is compatible with recent developments in ISM data processing and requires minimal knowledge of physical parameters.
Broadband CARS high-throughput single-cell imaging
Authors: Muddiman Ryan , Hennelly Bryan
Published: October 2023

Broadband Coherent anti-Stokes Raman Scattering (BCARS) enables the whole vibrational spectrum of cytologically prepared samples to be obtained using a hyperspectral raster scan approach. This technique has the potential to enable high-throughput automated detection of cell abnormalities. Images are distorted by the non-resonant background which requires a treatment for proper analysis. Using statistical denoising and phase retrieval returns Raman spectra similar to that of a spontaneous Raman measurement. Here, we present our work using this method for single-cell imaging of PEO1 ovarian adenocarcinoma cells prepared with the ThinPrep processor which enables label-free Raman cytology.
Changes in the Observed Shape of H6TPPS J-Aggerates by the Polarisation of the Incoming Light
Authors: Krause Alon , Zar Tchiya , Salomon Adi
Published: October 2023

Samples of H6TPPS J aggregates and bundles, deposited on glass and aligned under nitrogen flow, were measured in a 2-photon microscopy setup. Changes in the polarization state of the incoming laser have shown a difference in the resulting 2-photon scanning of the same measured sample, revelling otherwise hidden features. In addition, tracing the response of certain areas under different polarisation can provide information about the arrangement of the dipoles in that area. This shows the significant role of polarisation in 2-photon measurement, and the need to consider such effects in the microscopy of biological samples.
Complete design of an efficient and fully integrated graphene-based compact plasmon coupler for the infrared
Authors: Renversez Gilles , Natarajan Aswani , Demésy Guillaume
Published: October 2023

A fully integrated waveguide-based, efficient surface plasmon coupler composed of a realistic nontapered dielectric waveguide with graphene patches and sheet is designed and optimized for the infrared. The coupling efficiency can reach nearly 80% for an optimized coupler as short as 700 nm for an operating wavelength of 12µm. This work is carried out using rigorous numerical models based on the finite element method taking into account 2D materials as surface conductivities and the finite number of graphene patches contrarily to the usual methods based on grating analysis. The key numerical results are supported by physical arguments based on a modal approach or resonance conditions. These arguments can help to design other similar couplers or tofind the optimized parameters at other wavelengths.
Radiative heat exchange driven by acoustic modes between two solids at the atomic scale
Authors: Gómez Viloria Mauricio , Guo Yangyu , Merabia Samy , Messina Riccardo , Ben-Abdallah Philippe
Published: October 2023

In the near field (for separation distances smaller than the thermal wavelength, of the order of some microns at ambient temperature), the radiative heat flow between two solids at different temperatures can exceed the blackbody limit by several orders of magnitude. Furthermore, at the atomic scale, close to contact, the vibrational modes of the crystal lattice are expected to play an important role in the heat exchange. While the contribution of acoustic phonons tunnel-ing due to Van der Waals forces and electrostatic interactions near the surface has been investigated [1–5], the radiative contribution of the acoustic modes has been neglected so far. Under the local assumption (wavevector k ≈ 0), optical modes are independent from the acoustic modes, and are the sole responsible for the thermal radiation for distances larger than a few nanometers. However at subnanometer distances, the electromagnetic response of solids is nonlocal (k ≠ 0) and both acoustic and optical modes are coupled, contributing together to the radiative heat exchange. In order to demonstrate the role of this contribu-tion, we calculate [6] the nonlocal dielectric permittivity of magnesium oxide (MgO) using molecular dynamics. In conjunction with fluctuational electrody-namics calculations, we are able to highlight the role of radiation between two polar crystals produced by acoustic modes compared to the expected results from the local theory. We show that this additional contribution can become the dominant channel for radiative heat exchanges at atomic scale in the cryo-genic regime (below 100 K). Since the acoustic vibration modes can be excited with the help of piezoelectric transducers, our work opens the possibility to the control of radiative heat exchanges at atomic scale using external mechanical actuation.
RETRACTED : Experimental observation of electromagnetic wave localization in Vogel spirals
Authors: Aubry Geoffroy J. , Razo-López Luis A. , Pinheiro Felipe A. , Mortessagne Fabrice
Published: October 2023

This paper is retracted as it was included in error in the proceedings. The proceedings Editors are responsible for this mistake and apologise for it.

Request approved by the proceedings Editors and the Publisher on November 3, 2023.
Bispectral Optical Cavity based on Twin Metamirrors
Authors: Shelling Neto Liam , Dickmann Johannes , Sauer Steffen , Kroker Stefanie
Published: October 2023

Metasurfaces, the two-dimensional variant of metamaterials, manipulate light in unique ways, opening up a whole new world of optical functionalities, ranging from optical imaging to quantum optics. High reflectivities and tailored phase profiles could allow such metamirrors to outperform conventional multilayer mirrors for high-precision optical interferometry due to their low thermal noise. Here, we design twin metamirrors with theoretical reflectivities of > 99.9 % at 1064 nm and 1550 nm. These mirrors can be implemented in bispectral low-noise optical cavities, which would reduce the number of cavities or can be used as a transfer cavity for quantum experiments like atomic clocks.
Enhancement of Quantum Dot Fluorescence by a Metal Nanoparticle/Porous Silicon Microcavity Hybrid System
Authors: Granizo Evelyn , Kriukova Irina , Samokhvalov Pavel , Nabiev Igor
Published: October 2023

Enhancement of quantum dot (QD) fluorescence in a hybrid system of a porous silicon microcavity (pSiMC) and silver nanoplatelets (AgNPs) has been estimated using numerical simulation. The system was simulated as a periodic unit cell made of a pSiMC with a resonant wavelength peak at 605 nm, an AgNP with a resonance at 604 nm and a quantum dot (QD) with an emission peak at 605 nm. For comparison, simulations were performed for an AgNP and a QD in a reference single-layered system with a high refractive index. The QD fluorescence was enhanced in the AgNP/pSiMC hybrid system, mainly due to the higher excitation rate.
3D printing of quantum dot embedded polymer nanowires for patterning to triangular-delta and Bayer
Authors: Pyo Jaeyeon
Published: October 2023

This contribution presents a method for producing nanoscale color pixels for high-resolution displays using 3D printing of vertically freestanding nanostructures containing red, green, or blue light-emitting quantum dots (QDs). Traditional methods for producing pixels suffer from decreased brightness and pixel density at higher densities due to the reduced volume, but our 3D printing method allows for individual control of brightness by adjusting pixel height in 3D, resulting in a two-fold increase in brightness without changing lateral dimensions. We demonstrate sub-micrometer pixels representing primary colors at a super-high density, enabling image patterns with a pixel resolution of 8,400 ppi and individual modulation of sub-pixels with a possible pixel resolution of 5,600 ppi in triangular-delta and Bayer type designs. The method can be applied to displays, information storage, cryptography, and image sensors. The 3D printing method is a versatile approach for photonic research and has potential for contributing to the development of a range of applications.
Non-local property of single-photon states: Illustration with spontaneously emitted photon from a Hydrogen atom
Authors: Federico Maxime , Jauslin Hans-Rudolf
Published: October 2023

We discuss a new proof of the non-locality of single-photons using a concrete physical observable such as the local energy density. As an illustration of this non-locality, we compute the mean value of the local energy observable for the spontaneous emission from a Hydrogen atom. We find that, in the subspace of single-photon states, the mean value of the local energy density observable is non-zero everywhere and decreases as a power of the distance.
Conductive graphitic wires generation in diamond by means of pulsed Bessel beam micromachining
Authors: Kuriakose Akhil , Chiappini Andrea , Sotillo Belen , Britel Adam , Apra Pietro , Picollo Federico , Jedrkiewicz Ottavia
Published: October 2023

We present the fabrication of transverse graphitic microelectrodes in a 500 μm thick synthetic diamond bulk by means of pulsed Bessel beams. By suitably placing the elongated focal length of the Bessel beam across the entire sample, the graphitic wires grow from the bottom surface up to the top during multiple shot irradiation. The morphology of the microstructures generated and the micro-Raman spectra are studied as a function of the laser parameters and the diamond crystal orientation. We show the possibility to generate high conductivity microelectrodes, which are crucial for the application of electric fields or current transport/collection in various chips and detectors.
Laser-printed emissive metasurface as an optical security platform
Authors: Lee Myeongkyu , Kang Dongkyun , Pyo Jungwoo , Kim Jaehyeong , Joo Yinhyui , Jeon Jongyun
Published: October 2023

Optical security is a promising application of metasurfaces because light has large degrees of freedom in metasurfaces. Although many different structures/materials have been proposed for this purpose, the fabrication of dynamic metasurfaces in a straightforward and scalable manner while maintaining a high security level remains a significant challenge. Herein, a metasurface consisting of a phase-changing Ge2Sb2Te5 (GST) layer and a thin metal back reflector is presented to space-selectively and dynamically control the infrared emission of the surface by a spatially modulated pulsed laser beam. Unlike conventional laser processes using a focused beam, the employed laser printing is an expanded beam-based parallel process that enables the fabrication of wafer-sized emission patterns. Owing to the multispectral responses of GST, mutually independent visible and infrared images can be printed in one region. Grayscale emission patterns can also be obtained by gradually modulating the spatial profile of the laser beam, which makes the replication of laser-printed emission patterns extremely difficult. We also demonstrate that colors images can be obtained by depositing IR lossless layer on the GST surface. All these features indicate that the presented emissive metasurface has the potential for use as an effective platform for anti-counterfeiting.
Nanoporous metallic networks: Growth process and optical properties
Authors: Hamode Mohamed , Ron Racheli , Krause Alon , Salomon Adi
Published: October 2023

Nanoporous metallic systems exhibit a new generation of advanced materials with potential in a wide variety of technological fields among them catalysis, photonics, optoelectronics and sensors.Their high surface-to-volume ratio, multimodal nanoscale moieties, ability to host guest materials, and inhomogeneous surface at the submicron scale distinct them from both bulk metals and conventional plasmonic materials as well as meta-surfaces. Those structures can be prepared through different fabrication and synthesis strategies including chemical dealloying, assembly of pre-synthesized metallic nanoparticles, and via templating. In a sharp contrast with these preparation strategies, we have demonstrated one can fabricate a macroscopic nanopourus metallic networks by using physical vapor deposition in a short single-step process. These materials are highly pure, and they show very unique linear and non-linear optical properties, among them high Second-Harmonic-generation response.

Herein, we will discuss their growth process mechanism, and utilize it for more complex 3d structure which behave as SHG reflectors.
Second harmonic generation in modal phase-matched AlGaAs-on-insulator waveguides
Authors: Lu Xinda , Zheng Yi , Ye Chaochao , Yvind Kresten , Pu Minhao
Published: October 2023

We utilize modal phase matching and type-I configuration to achieve second harmonic generation in AlGaAs-on-insulator waveguides. We demonstrate an overall normalized conversion efficiency of 200% W-1 cm-2 at a pump wavelength of 1587 nm in a 1-mm-long waveguide.
Broadband second harmonic generation by birefringent phase matching in an X-cut LiNbO3 membrane
Authors: Zinaoui Aiman , Grosjean Lucas , Khouri Martin , Coste Antoine , Suarez Miguel Angel , Queste Samuel , Gauthier-Manuel Ludovic , Robert Laurent , Chauvet Mathieu , Courjal Nadege
Published: October 2023

We designed an X-cut lithium niobate (LiNbO3) membrane dedicated to type I second harmonic generation (SHG) at telecom wavelength. A competitive conversion efficiency compared to a quasi-phase-matched configuration with the advantage of a broadband response of 100nm is shown.
Improving photon pair generation in silica nanofibers through PMMA/DR1 nonlinear coating optimization
Authors: Azzoune Abderrahim , Divay Laurent , Larat Christian , Lebrun Sylvie
Published: October 2023

We report on the use of PMMA/DR1 coating to enhance the efficiency of photon pair generation in silica nanofibers. The coating improves the second-order nonlinear susceptibility of the nanofibers, leading to improved photon pair generation efficiency. We investigate the effect of varying the nonlinear optical properties of the composite material, and we characterize the photon pair generation efficiency of the coated silica nanofibers. Our modelling results show a significant enhancement in photon pair generation efficiency by a factor of 1000 compared to a bare silica nanofiber.
Dynamics control in four-wave mixing processes in optical fiber
Authors: Sheveleva Anastasiia , Colman Pierre , Dudley John M. , Finot Christophe
Published: October 2023

A nonlinear interaction of waves in a dispersive medium manifests itself in a four-wave mixing process that can be described as an evolution of waves’ parameters on a phase plane in a form of closed orbits. Here we propose a method to control these trajectories and to switch from one state to another in an optimal manner by implementing an abrupt change of the average power. The method is confirmed experimentally by the reconstruction of a fundamental four-wave mixing dynamics in an idealized model using iterative propagation in a short segment of fiber.
Time-division multiplexing of Mbit/s data-packets within Gbit/s data sequences through nonlinear temporal focusing
Authors: Fatome Julien , Erkintalo Miro , Coen Stéphane
Published: October 2023

In this work, we report on an all-optical, real-time, nonlinear temporal compression technique based on a counter-propagating degenerate four-wave mixing interaction in birefringent optical fibres. As a proof-of-concept, we demonstrate the extreme temporal focusing and interleaving of a 10-Mbit/s data packet into a 10-Gbit/s data sequence, with record temporal compression factors ranging from 3 to 4 orders of magnitude and including non-trivial on-demand time-reversal capabilities. Our approach is scalable to different photonic platforms and offers great promise for ultrafast arbitrary optical waveform generation and related applications, while enabling the compression of THz-bandwidth optical signals from low-cost, low-bandwidth optical waveform generators.
Soliton-number measurement in lossy waveguides
Authors: Castelló-Lurbe David , Cuadrado-Laborde Christian , Silvestre Enrique , Díez Antonio , Andrés Miguel V.
Published: October 2023

A general technique for obtaining the soliton number, and hence the nonlinear coefficient, in wave-guides with high dispersion and loss is derived and demonstrated numerically and experimentally in a kilometer-long standard silica fiber pumped close to 2 µm.
All-Optical Stabilization of Soliton Microcomb via CW Laser Injection - INVITED
Authors: Wildi Thibault , Ulanov Alexander , Voumard Thibault , Ludwig Markus , Herr Tobias
Published: October 2023

Repetition-rate locking in soliton microcombs via the injection of a weak second continuous-wave laser in the spectral wing of the soliton is studied experimentally, resulting in all-optical control and reduction
Double-frequency-comb-like source with PM passive fibre cavity and Gain Through Filtering
Authors: Stefano Negrini , Auro Perego M. , Matteo Conforti , Arnaud Mussot
Published: October 2023

In this work, we present a theoretical and numerical study about the generation of double- frequency-comb-like source with Gain Through Filtering (GTF) in passive Polarization Maintaining (PM) fibre ring cavity.
Nonlinear frequency chirps from a stabilized injected phase-modulated fiber laser loop
Authors: Brunel Marc , Frein Ludovic , Loas Goulc’hen , Carré Anthony , Le Beux Thomas , Tolba Nacim , Alouini Mehdi , Guillet de Chatellus Hugues , Vallet Marc
Published: October 2023

A phase-modulated frequency-shifting loop is injected by a single-frequency laser at 1.5 μm. In so-called Talbot conditions, i.e., when the modulation frequency is an integer multiple of the inverse of the cavity round-trip time, the loop generates a frequency comb whose temporal trace consists in a train of pulse doublets whose positions in time depend on the frequency of the injection laser. When the modulation frequency is slightly detuned from the Talbot condition, nonlinear frequency chirps are predicted and observed in the output pulse train. We demonstrate that these nonlinear chirps are not restricted to sinusoidal shapes, and also that the loop can be stabilized by exploiting the intracavity phase modulation.
Kerr solitons in high-Q integrated Fabry-Pérot microresonators
Authors: Wildi Thibault , Gaafar Mahmoud , Voumard Thibault , Ludwig Markus , Herr Tobias
Published: October 2023

Disspative Kerr Solitons are generated in an integrated standing wave Fabry-Pérot microresonator. Enabled by synthetic anomalous dispersion provided by a pair of Photonic Crystal Reflectors (PCR) forming a high-Q cavity, the generated soliton pulses exhibit a unique spectral profile extending beyond the PCRs’ bandgap.
Eliminating local convergences in FROG retrieval algorithms
Authors: Krook Christoffer , Pasiskevicius Valdas
Published: October 2023

The complicated electric field structure of ultrashort pulses as characterized by frequency-resolved optical gating (FROG) algorithms often results in local convergence, which does not accurately represent the actual field pulse. We present an efficient and universal test procedure applicable to any FROG retrieval algorithm that allows recognition of the erroneous local convergence. The 100% efficacy of the procedure is demonstrated using Line-Search FROG algorithm, and comparison is given with the performance of a standard extended ptychographic iterative FROG trace retrieval engine.
Single-stage GaSe OPCPA delivering high-energy few-cycle pulses at 11 µm wavelength – INVITED
Authors: Bock Martin , Ueberschaer Dennis , Fuertjes Pia , Griebner Uwe
Published: October 2023

The generation of sub-five optical cycle pulses centered at 11.2 µm wavelength with 50 µJ energy at a 1 kHz repetition rate is reported. A GaSe optical parametric chirped pulse amplifier (OPCPA) is driven by the residual 2.0 µm pump and 5 µm idler of a high-energy midwave-IR OPCPA. The latter serves as driver for hard X-ray generation and this makes the achieved fs longwave-IR pulses available for X-ray pump-probe experiments.
Bifurcations and spectral pulsations in ultrafast fiber lasers
Authors: Coillet Aurélien , Wang Zhiqiang , Hamdi Saïd , Zhang Zuxing , Grelu Philippe
Published: October 2023

We employ real-time spectral measurements to investigate the transitions from the stable mode locking to period doubling and long-period pulsations. We highlight the role of self-phase modulation as a general mechanism triggering period-2 bifurcations. We analyze the new frequencies generated during the sequence of bifurcations and report an entrainment where the period of the long oscillation locks to multiples of the cavity roundtrip time.
Multipass cell post-compression at 515 nm as an efficient driver for a table-top 13.5 nm source
Authors: Karst Maximilian , Pfaller Pauline , Klas Robert , Abdelaal Mahmoud , Wang Ziyao , Rothhardt Jan , Limpert Jens
Published: October 2023

We present a table-top, efficient and power scalable scheme enabling the effective generation of extreme ultraviolet radiation up to 100 eV photon energy. Therefor ultrashort pulses (< 20fs) in the visible spectral range (515 nm) are used to drive high harmonic generation (HHG) in helium. This allows for a significant efficiency boost compared to near-infrared (NIR) drivers, enabled by the favourable scaling of the single-atom response of λ-6 [1]. The experimental realization of a mulitpass cell delivering 15.7 fs pulses with a peak power close to 25 GW at 515 nm and an overall efficiency (IR to compressed green pulse) of >40 %. In conjunction, preliminary HHG results will be presented, paving the way for mW-class HHG sources at 13.5 nm.
The master equation for passive modelocking
Authors: Prati Franco , Perego Auro M. , Redondo Javier , de Valcárcel Germán J.
Published: October 2023

Passive modelocking (PML) of lasers is pivotal in modern science and industry. Here, solving a half-century-long challenge, we present the first master equation (ME) describing PML on all time scales, from Q-switched to fundamental and harmonic modelocking, valid for both slow and fast saturable absorption, short and long cavities. The proposed ME should become the workhorse for analytical and numerical studies of ultrafast lasers in both the photonics engineering and laser physics communities.
Generation of high repetition rate THz radiation at the mill-watt-level via optical rectification in an enhancement cavity
Authors: Suerra Edoardo , Canella Francesco , Giannotti Dario , Cialdi Simone , Galzerano Gianluca
Published: October 2023

We propose an experimental method for the generation of coherent terahertz radiation in the spec-tral region between 0.2 THz and 2 THz, with a high repetition rate of nearly 100 MHz, and with an average power at the milliwatt level. An Ytterbium-doped mode locking laser is amplified to 60 W, and pulses are stacked into an optical cavity up to 750 W. There, they interact with a Gallium Phosphide crystal producing THz radiation via optical rectification. With the cavity enhanced configuration, we show that more than one order of magnitude can be gained with respect to simply focalize the 60 W beam into the GaP crystal.
Holographic Mixed Reality Ultra-High-Definition Traffic Signs to Increase Safety and Inclusivity in Transportation
Authors: Skirnewskaja Jana , Montelongo Yunuen , Wilkinson Timothy D.
Published: October 2023

Current 2D windshield head-up displays can lead to driver distractions due to a shift of gaze from the road towards a small area of the windshield. Customizable mixed reality real-time head-up displays can increase safety in transportation due to the holographic road obstacles being aligned with the road scene. Based on accelerated parallel processing algorithms, a 4K spatial light modulator, virtual Gabor lenses and a He-Ne laser, 3D holographic road signs appear within 1.15 seconds in the driver’s gaze on the road.
3D Chiral Metamaterials for Biosensing - INVITED
Authors: Manoccio Mariachiara , Esposito Marco , Passaseo Adriana , Tasco Vittorianna
Published: October 2023

In this contribution we will discuss the experimental application of 3D chiral metamaterials as high sensitivity biosensors, exploiting circular dichroism in transmission. 3D metamaterials with chiral features can be realized by highly accurate and highly localized bottom-up nanofabrication approach. Large chiroptical effects can be engineered, originating from the single element optical resonances, but collective interactions in arrayed configurations can play a significant role, further enhancing these effects. Capability of biomarker detection in the femtomolar range is demonstrated even in complex biofluid matrix.
How to Use Fiber Optic Sensors for Accurate Absolute Measurements - INVITED
Authors: Frazão Orlando , Robalinho Paulo , Vaz António , Soares Liliana , Soares Beatriz , Monteiro Catarina , Novais Susana , Silva Susana
Published: October 2023

The scientific community has been exploring new concepts as a result of the usage of optical fibers as absolute measurement sensors. While cross-sensitivity is a common issue with optical fiber sensors, this issue has been mitigated by simultaneous measurement techniques. But when it comes to absolute measurements, these methods have some limitations. The white light interferometer, which offers a superb solution for a range of applications, especially for absolute temperature measurement, is one of the most often used methods for absolute measurements.
Bias-free multiparametric luminescence sensing by a single upconverting particle
Authors: Ortiz-Rivero Elisa , Marin Riccardo , Jaque Daniel , Haro-González Patricia
Published: October 2023

Control over particles is key for bio-applications. Rotation dynamics analysis allows the medium characterization. An optically trapped and rotated microparticle is presented as sensor to characterize the properties of a liquid medium at the microscale..
Development and application of additive manufactured fine grinding tools for the processing of fused silica
Authors: Henkel Sebastian , Knauf Monique , Katzer Franz , Wille Toni , Bliedtner Jens , Gerhardt Martin , Rädlein Edda
Published: October 2023

The development or the improvement of production processes are necessary aspects, in order to enhance the quality and efficiency in optical manufacturing. This paper presents an approach to manufacture fine grinding tools in a very flexible and efficient way. A new filament composed of polyamide, ZrO2 particles and diamond grains is developed and used in an additive manufacturing process for tool fabrication. The resulting tools are successfully applied in an ultra-fine grinding process on fused silica samples.
Development of flexible polishing tools for synchro-speed polishing processes using additive manufacturing
Authors: Schulze Christian , Henkel Sebastian , Bliedtner Jens , Fähnle Oliver , Kern Kerstin , Allaart Jan , Surberg Henrik , Bode Jürgen , Rädlein Edda
Published: October 2023

A new concept for synchro-speed polishing of flat and spherical surfaces is introduced: 3D printed gradient index (GRIN) polishing tools. By using additive manufacturing technologies in combination with photopolymer plastics, GRIN tools can be fabricated that are individually adapted to the workpiece geometry. By using two different plastics, the hardness and therefore the removal rate of certain tool areas can be defined. Surface structures, benefiting material removal rate and tool wear rate, are possible as well as lightweight structures with high mechanically stability. Tools can be fabricated as thin foils as well as solid pads, ranging from small (few mm) to large diameters. Additionally, the pads can be fabricated with an individual radius. This can enable the replacement of radius-dependent tool holders, because the pads can be mounted on flat tool interfaces, since the radius is not dependent from the tool body anymore. First results from the experimental setup are showing, that by using GRIN foils similar surface quality results can be achieved in comparison to conventional polyurethane foils, while the GRIN foils are offering a lot more possibilities regarding process optimization.
Reducing the Effects of Low Albedo of Asphalt Materials Incorporating Polyethylene Glycol (PEG) 1000, 2000 and 4000 as Phase Change Materials (PCM)
Authors: Pinheiro Claver , Hammes Nathalia , Lima Orlando , Landi Salmon , Homem Natália , Rocha Segundo Iran , Felgueiras Helena P. , Freitas Elisabete , Costa Manuel F. M. , Carneiro Joaquim
Published: October 2023

Albedo plays a vital role in urban microclimates. Civil engineering structures usually absorb a high amount of energy in form of heat, for example asphalt pavements, which have a low albedo, thus contributing to the Urban Heat Island (UHI) effects. Modifying the physical characteristics of asphalt pavements, including reflectance and thermal properties, can help mitigate UHI. The literature points out that one alternative to thermoregulating asphalt materials is the incorporation of phase change materials. Thus, the main goal of this research is to present a systematic review regarding the effectiveness of the incorporation of polyethylene glycol (PEG) 1000, 2000 and 4000 as Phase Change Material (PCM) in asphalt materials. The results showed that incorporating PEG into asphalt materials can regulate heat storage, promoting stability and reducing UHI effects. PEG2000 was more frequently used. PEGs can reduce between of 3.5 and 4.2ºC of the asphalt materials when compared to the conventional ones.
Design Approach for an Advanced Multi-Channel Pyrometer for Bulk Oven Processes
Authors: Fritzsche Rune , Kaiser Clemens F. , Herdrich Georg , Grün Jürgen , Grün Tobias
Published: October 2023

Industrial processes such as smelting and sintering require stable and precise temperature control of furnaces. To achieve this, accurate temperature measurements are required. Pyrometry allows for contact-less measurement of bulk materials and is particularly suitable for high temperature applications. One of the main influences on the accuracy of pyrometric measurements is the knowledge of the emissivity in the spectral measurement range. To reduce this dependence, two-color pyrometers or multi-color pyrometers can be used. With this in mind, the IRS is further developing their existing pyrometer technology by designing an advanced multi-channel pyrometer for bulk oven processes in a joint venture with Stange Elektronik GmbH and New Generation Kilns Grün GmbH. The design process is explained here and the different methods of achieving emissivity independence are examined.
Investigations on the causes of process vibrations in CNC grinding processes and their effects on achievable surface qualities on fused silica
Authors: Binder Marcel , Henkel Sebastian , Bliedtner Jens , Fritzsche Marco , Biegler Eugen , Sunkara Harish , Schöneweck Franziska , Greiner-Adam Sascha , Flügge Jörg
Published: October 2023

The presented investigations build on the results already presented at EOSAM 2022 on the in-situ monitoring of grinding processes, in which high correlations between vibrometry, force and topography data of machined fused silica samples could already be proven. With the help of new measurement setups, it was possible to also detect high-frequency vibration components in CNC grinding processes and to check their effects on the resulting surface qualities. The investigations were carried out on a 5-axis CNC machine and monitored with the help of vibrometric and white-light interferometric measurement technology. The aim was to look at the influences of process-side parameters on the process vibrations and the resulting surface qualities.