bluuebunny/crossref_metadata_2025 huggingface dataset:
Analysis of Ring Radius and Q-Factor for Enhanced Bandpass Filter performance in Racetrack Ring Resonators
Authors: Gupta Naveen Kumar , Vardhan Shalini , Singh Ritu Raj
Published: December 2024

There have been various studies on the racetrack ring resonators, which aimed to calculate various resonators parameters, Free Spectral Range (FSR), Full Width at Half Maximum (FWHM), Finesse (F), Quality (Q) factor [1], and Sensitivity. Optical Resonators have numerous applications in Photonic Integrated Circuits (PIC), from Optical filters to Sensors [2], Switches [3], Lasers [4], Modulators [5], Multiplexers [6]. In this research article, an optical Racetrack Ring Resonator (RTRR) is proposed as a band pass filter and the effect of ring radius (R) is demonstrated to optimize the Q-factor for bandpass filter (BPF) applications. The wavelength band for the study of band pass filter ranges from 1300 nm to 1900 nm.
Two-Dimensional Broadband Silicon Optical Beam Scanning Device for Free-Space Optical Communication
Authors: Atsumi Yuki , Yoshida Tomoya , Matsumoto Ryosuke , Konoike Ryotaro , Ikeda Kazuhiro , Inoue Takashi , Suzuki Keijiro
Published: December 2024

Silicon photonics-based beam scanning technology is expected to be introduced into short-distance free-space optical (FSO) communication applications such as inter/intra rack communications in data centers and indoor mobile communications in beyond-5G mobile communications [1]. In this report, we present our recent work about a broadband two-dimensional (2D) Si beam scanning device shown in Fig. 1 that integrates 128-port three-dimensionally-structured optical surface couplers known as “elephant couplers”[2-4]. This device can realize high-capacity FSO signal transmission by introducing wavelength-division multiplexing (WDM) technology. The fabricated device shows a fiber-to-fiber insertion loss of 5.6 dB and a 1-dB spectrum bandwidth of 40 nm.
Cascading meta-devices for advanced functions and applications
Authors: Zhang Jing Cheng , Tsai Din Ping
Published: December 2024

Metasurfaces, recognized as subwavelength antenna collections, offer many possibilities for managing electromagnetic waves and streamlining the dimensions and intricacy of electromagnetic apparatus. These structures can govern diverse aspects of electromagnetic waves, encompassing amplitude, wave-length, polarization, phase, orbital angular momentum, and more. Multilayer meta-devices provide a greater degree of freedom to manipulate the light and have a better ability to perform various functions. In this thesis, various multilayer meta-devices have been systematically developed for advanced functions and applications, such as 6G communications, chiral imaging, and light field control for other advanced applications.
All-PM, Soliton mode-locked, dual-comb fiber laser with single-walled carbon nanotubes for high-precision spectroscopy
Authors: Yifei Zhu , Kitajima Shotaro , Nishizawa Norihiko
Published: December 2024

In this study, we successfully implemented an all-polarization maintaining, soliton mode-locked, fiber laser using single-walled carbon nanotubes (SWNTs)[1]. The laser employs a mechanical sharing concept to achieve high mutual coherence[2]. It has a repetition frequency of 70.9 MHz and a frequency difference of approximately 100 Hz. We conducted the experiments of dual comb spectroscopy for hydrogen cyanide (HCN) gas and observed the corresponding absorption spectra[3].
Er:fiber Comb System Optimized for mW-class Mid-infrared Light Generation Using a Waveguide-type Periodically Poled Lithium Niobate Crystal
Authors: Mitsumoto Ryo , Kuse Naoya , Nakajima Yoshiaki , Yasui Takeshi , Minoshima Kaoru , Yoshii Kazumichi
Published: December 2024

The mid-infrared (MIR) region is rich in molecular absorption lines that can be used to identify trace gases and other substances. The 3-5 μm wavelength region, which is called the first MIR atmospheric window, is of particular interest because it contains the fingerprints of many hydrocarbons, nitrogen oxides, and greenhouse gases. In the near-infrared region, new spectroscopic techniques using optical frequency combs have been actively studied, and particularly, dual-comb spectroscopy using two optical combs is attracting attention as a broadband, high-precision, and high-speed Fourier spectroscopy method. Against this background, dual-comb spectrometers in the 3-5 μm range are expected to be a new real-time and open-pass measurement method for environmental measurements and breath analysis.
Pt Nanocluster Decoration on WSe2 for Enhanced NO2 Sensing: A DFT Investigation
Authors: Bharti Neetu Raj , Kushwaha Aditya , Goel Neeraj
Published: December 2024

Gas sensors play a crucial role in various aspects, from ensuring safety to environmental conditions. NO2 is indeed a harmful gas, primarily emitted from the combustion of fossil fuels and industrial activities, causing health problems and contributing to pollution [1]. Decorating noble metals on 2D transition metal dichalcogenide (TMD) nanomaterial may benefits like enhanced sensitivity, selectivity, fast response and so on [2]. In this work, a density functional theory (DFT) study compared NO2 sensing in pristine WSe2, one Pt atom decorated at the hollow site (WSe2-1Pt), two Pt atoms decorated at a hollow site (WSe2-2Pt) and three Pt atoms decorated at a hollow site (WSe2-3Pt) over WSe2 monolayer. To enhance the sensitivity response of WSe2 upon NO2, the decoration of the Pt atom was proposed to improve the chemical activity and electron mobility of the whole system.
Low-temperature-grown dilute bismide III-V compound semiconductors towards fabrication of photoconductive antenna for terahertz-wave emission and detection
Authors: Tominaga Yoriko , Ishikawa Fumitaro , Ikenaga Noriaki , Ueda Osamu
Published: December 2024

Towards the 6th generation mobile communications system (6G), it is considered to expand a frequency band higher than that for 5G, 95 GHz–3 THz, and electromagnetic waves up to approximately 300 GHz are under consideration[1]. Therefore, developing and realizing devices that can operate in these frequency bands is an urgent issue. It is essential to elucidate the dielectric, magnetic, and electrical properties of semiconductors and other electronic materials, which constitute the development and manufacturing processes, in these frequency bands. It is said that 6G will be in operation in 2030, the demand for material property measurement systems for the frequency range from the high-frequency band of millimeter waves to the THz wave region (300 GHz up to 3 THz) is expected to significantly increase in the next decade. The authors are focusing particularly on dilute bismide (Bi) III-V compound semiconductors grown at low temperatures as a candidate material for photoconductive antenna (PCA) that is a device often used for generating and detecting THz wave in these frequency bands as a drive source of ultrashort laser pulses in the THz time-domain spectroscopy system.
Terahertz spectroscopy and imaging of circular dichroism in chiral metasurfaces
Authors: Yoichi Takumi , Chiba Uina , Sasaki Rinpei , Minari Takeo , Ohno Seigo , Miyamoto Katsuhiko
Published: December 2024

Optical metamaterial elements that break mirror symmetry, such as swastika-shaped lattice structures, have been shown to exhibit chirality in the terahertz (THz) region, which is due to the spiral character of their hierarchical three-dimensional structure. However, in ordinary THz imaging with a linearly polarized beam, it has been difficult to quantify chiral optical characteristics, limiting the ideal design of metamaterials.
Kinetics analysis of anti-CD9 antibody and H1299 EV using terahertz chemical microscope
Authors: Ma Yuchen , Liu Changjiang , Ding Xue , Wang Jin , Kiwa Toshihiko
Published: December 2024

In recent years, hospitals have used PET-CT scans and pathology to detect lung cancer, but PET-CT scans involve the use of radioactive tracers as well as X-rays from the CT scan, frequent scans can increase long-term health risks, and pathology requires advanced technology. Recent studies have shown that exosomes released from cells can provide the information needed to detect and diagnose cancer. Exosomes play an important role in tumourigenesis, cancer invasion, angiogenesis, tumour microenvironment formation and cancer metastasis. Currently, exosome detection methods include SPR and ELISA, but both have limitations and cannot quickly detect small samples. To address these problems, our research group developed terahertz chemical microscope (TCM) [1,2,3]. Through TCM detection, we found that the concentration of exosomes is proportional to the intensity of terahertz waves. This demonstrates TCM can be used for the quantitative analysis of exosomes.
Low and High Spatial Frequency Periodic Surface Structure Formation under Terahertz Free Electron Laser Irradiation
Authors: Wang You Wei , Yang Zihao , Kato Kosaku , Agulto Verdad C. , Makino Kotaro , Tominaga Junjii , Isoyama Goro , Nakajima Makoto
Published: December 2024

Terahertz (THz) technology has recently seen significant advancements and applications in several fields, including ultrafast electric field measurement[1], semiconductor diagnostics[2], and magnetic material control[3]. Ablation phenomena in the terahertz range have been relatively underexplored due to the limited availability of powerful THz sources. However, recent progress in laser technology has opened up opportunities for the development of high-intensity THz sources, thereby facilitating investigations into ablation processes [4] and nonlinear effects [5]. These advancements have also made it possible to generate high-intensity pulses capable of inducing laser induced periodic surface structures (LIPSS) on materials, offering a promising avenue for surface nanostructuring. In this study, we investigated LIPPS formation on Ge2Sb2Te5 (GST), a material renowned for its phase-change recording properties [6], by the irradiation of a high-intensity THz free electron laser (FEL). We observed the emergence of two types of LIPSS through laser ablation. These LIPSS can be categorized as either low spatial frequency LIPSS (LSFL) or high spatial frequency LIPSS (HSFL) depending on their periodicity.
Determining Elastic Modulus of Fiber Material by Cantilever Vibration Method
Authors: Mondal Saikat , Chaudhuri Partha Roy
Published: December 2024

This research demonstrates the determination of the elastic modulus of the material of optical fiber by experimentally calculating natural vibration frequency utilizing Euler-Bernoulli cantilever beam vibration theory[1].
Large-Area Moiré Metamaterials with Adjustable Chiroptical Properties Using TiO2 Nanoantenna Stickers
Authors: He Jiayang , Murai Shunsuke , Lo Tienyang , Tanaka Katsuhisa
Published: December 2024

Chiral metamaterials, known for their chiroptical effects, exhibit asymmetric responses to left- and right-circularly polarized light, resulting in higher circular dichroism (CD) compared to natural materials1,2. Currently, some chiral metamaterials, exemplified by helices3, offers inherent handedness, but their 3D nanostructure fabrication can be complex2.
Revisable Tuning of Tamm Plasmon Polaritons
Authors: Ye Ming-Jyun , Ishii Satoshi , Chen Kuo-Ping
Published: December 2024

Phase-change materials (PCMs) provide a specific combination of properties. The binary semiconducting chalcogenide Sb2S3 is consider one of the promising candidates, especially its intrinsic high refractive index, low loss and wide bandgap properties, in near infrared (NIR). Here, the Sb2S3 transformation from amorphous to crystal state embedded between the distribute Bragg reflector (DBR) and metal layer. At the interface between DBR and metal layer in specific parameter, Phase-change Tamm plasmon–polariton (PC-TPP) resonance could be produce. The PC-TPP resonance has a 70 nm modulation wavelength. Also, the resonance achieves around 100 nm-shifted in NIR at the proper incident angle.
Nonlinear mode converted with multi-color spectral composites
Authors: Chang K.-H. , Lai J.-H. , Pan T.-F. , Chiu H.-H. , Boudrioua A. , Lai C.-M. , Yokoyama H. , Higurashi E. , Akiyama H. , Peng L.-H.
Published: December 2024

Structured light beams constitute emerging light sources which are beneficial to fundamental studies as well as practical applications. Structured light is conventionally shaped in a monochromatic format either in the linear- or nonlinear-optics regime. Most of the related reports, by far, seek the assistance of π/2 cylindrical optics, spiral phase plate, q-plate, spatial light modulator, or meta-structures to achieve beam shaping either in phase or amplitude.
Third Harmonic Generation at THz Frequencies: Utilizing a Frequency Selective Metasurface Approach with Complementary Split Ring Resonators
Authors: Sahu Mitali , Chaudhuri Partha Roy
Published: December 2024

we report our investigation on third harmonic generation (THG) in the terahertz (THz) regime using double resonant frequency selective metasurface composed of square-shaped periodic complementary single split ring resonators.
Green Skyrmion fiber laser
Authors: Allam Srinivasa Rao , Yoneda Yuto , Kerriddge-Johns William R. , Fujimoto Yasushi , Omatsu Takashige
Published: December 2024

Optical skyrmions are topologically stable quasiparticles with variegated polarization textures [1], formed by the mixture of quantized spin and orbital angular momentum. In recently, their topological polarization textures have been successfully imprinted on polarization sensitive materials, such as azo-polymers [2], and they have also been utilized in nonlinear frequency conversion [3], and quantum entanglement [4].
Controlled Generation of White-Light Filaments in BK-7 Glass using Ultrafast Vector Pulses
Authors: Brundavanam Maruthi M , Uesugi Yuuki , Kozawa Yuichi
Published: December 2024

One of the fascinating mechanisms caused by the intense light-matter interaction is the generation of the filaments in optical media using ultrafast femtosecond lasers [1]. The filamentation using femtosecond laser pulses is of great interest due to its scientific vigor and practical applications [2]. The control of the filamentation and properties of the output optical field has gained large interest since its discovery [3].
Soliton evolution under the perturbative effects of Raman scattering in Highly Nonlinear Materials
Authors: Roy Abhisek , Chaudhuri Partha Roy
Published: December 2024

We have examined the propagation of temporally separated soliton pulses in single-mode optical fibers under the influence of Stimulated Raman Scattering (SRS), focusing on chalcogenide materials. Our study investigates the interplay of Kerr nonlinearity, Raman effects, and material-dependent collision length, demonstrating significant differences from typical soliton interactions. The findings from our research offers insights into nonlinear effects in high-power soliton transmission, suggesting potential applications in optical switches and mode-locked lasers.
All-fiber broadband photon pair generation in dispersion flattened highly non-linear fiber
Authors: Agnihotri Anadi , Krishnamurthy Pradeep Kumar
Published: December 2024

We report on a spontaneous four-wave mixing (SFWM) based broadband correlated photon pair generation using a dispersion flattened highly-nonlinear fiber (DF-HNLF). The DF-HNLF is pumped by a stable mode-locked laser (MLL) which generates pump pulses of 250 ps FWHM at a repetition rate of 94.509 MHz. The joint spectral intensity (JSI) data indicates photon pair generation across entire S, C, and L bands. The intrinsic photon pair generation rate, after accounting for spontaneous Raman scattering (SpRS), system loss, and detector dark counts, is ≈ 100kHz although due to detection gating limit we measured the rate to be 1 kHz at peak pump power of 70 mW. The use of an arbitrary waveform generator for establishing pump MLL and gating of the single-photon detectors (SPDs) allows for precise synchronization of generation and detection of photon pairs.
Observation of the van Cittert-Zernike Modification of Quantum Coherence
Authors: Ferdous Jannatul , Hong Mingyuan , Dawkins Riley B. , Mostafavi Fatemeh , Oktyabrskaya Alina , de J. Leon-Montiel Roberto , You Chenglong , Magana-Loaiza Omar S.
Published: December 2024

We report on the modification of quantum coherence via scattering of thermal multiphoton wave-packets upon propagation. Our observations are validated through the nonclassical formulation of the emblematic van Cittert-Zernike theorem.
Development of a Novel Visual Prosthesis Device: Using Phosphenes Produced with Facial tACS
Authors: Kurkjian Veronica , Sadrzadeh-Afsharazar Faraz , Douplik Alexandre
Published: December 2024

Two million Canadians live with vision loss. This project explores a non-invasive visual prosthesis using tACS to generate phosphenes. A developed mask proto-type and COMSOL simulations promise improved spatial accuracy, and feasibility for non-invasive phosphenes.
Towards Entangled Two-Photon Absorption in Cesium Atoms
Authors: Núñez Michael Stiven Caracas , Jaimes Miguel Ángel Gonz’alez , Egloff Dario , Portela Mayerlin Núñez
Published: December 2024

We address challenges in entangled two-photon absorption (ETPA) experiments, focusing on distinguishing ETPA signals in atomic systems, in particular, cesium. Our study presents theoretical and experimental methods to calculate and measure TPA and ETPA cross-sections.
Micro-cartridge Applied to Fluorine-18 Concentration Developed with Ultrashort Laser Pulse Machining
Authors: Gomes Antonio Arleques , Nario Arian P. , Lapolli André L. , Samad Ricardo E. , Bernardes Emerson S. , de Rossi Wagner
Published: December 2024

We present the first micro-cartridge developed in glass with ultrashort laser pulses machining, applied to radionuclide concentration to synthesize radiopharmaceuticals. The femtosecond laser is an alternative tool for developing these microdevices in different materials.
Measurement of the Quantum Dynamics of a Macroscopic Photonic System
Authors: You Chenglong , Hong Mingyuan , de J. León-Montiel Roberto , Dawkins Riley B. , Magaña-Loaiza Omar S.
Published: December 2024

We report on the observation of the nonclassical dynamics of a classical macroscopic system. The multiphoton dynamics of the subsystems can be opposite to that exhibited by the classical macroscopic system.
Experimental higher-order photon state classification assisted by machine learning
Authors: Wijesundara Chiran , Xu Guangpeng , Berry James , Stressinger Abigail , Thomay Tim
Published: December 2024

Classification of experimentally determined higher order photon states using a novel Machine Learning model based on a 2D Convolutional Neural Network (CNN) for rapid classification of multiphoton Fock states up to |3⟩.
Viability Analysis of Hepcidin-25 Detection by FTIR-Raman Spectroscopies and DFT-MD simulations
Authors: Rayo Alape Julian M. , Bandeira Carla Carolina Silva , Bonano Giovana , Nogueira Juan J. , Martinho Herculano
Published: December 2024

The hepcidin-25 is an iron homeostasis hormone regulator playing key role in hyperinflammation states. Here we present vibrational calculations, band assignment and limit of detection of hepcidin-25 aiming investigate viability of detection in biofluids.
Mid-Infrared Arthroscopy: In-Vivo Assessment of Cartilage Damage
Authors: Mizaikoff Boris
Published: December 2024

Owing to the recent technological advances in mid-infrared (3-20 μm; MIR) laser technology, especially cascade laser spectroscopy (CSL) has evolved into a state-of-the-art tool for the selective and sensitive quantification of trace analytes in liquid, solid, and gaseous state in a wide variety of sensing scenarios. High output power, narrow linewidths, single-mode operation, low power consumption, broad tunability and compact dimensions are just some of the most outstanding features of cascade lasers. Since their introduction in the mid 1990ies, quantum cascade lasers (QCL) and interband cascade lasers (ICL) have rapidly matured into the probably most important contemporary MIR laser light sources. In this presentation, we will discuss state-of-the-art sensing platforms that benefit from cascade lasers combined with miniaturized photonic platforms providing direct access to molecule- specific information. Indeed, point-of-care diagnostics in clinical settings are becoming more prevalent taking advantage of the fact that MIR detection schemes do not require reagents or labeled constituents, and therefore facilitate localized on-site analysis close to real-time. With increasing progress towards highly miniaturized MIR optical components, evidently devices useful in medical/clinical applications may directly capitalize on advantageous features of integrated MIR photonics. Quo vadis? For sure, in- vivo applications enabling direct sensing and/or condition monitoring within living organisms are considered the ‘holy grail’. We will highlight the utility of MIR catheter technology for analyzing cartilage damage in-vivo during arthroscopic surgery, and discuss potential and challenges when translating this technology into clinical practice.
Experimental Evaluation of the Impact of OSNR in MCF Interferometers
Authors: Melo C. , Cariñe J. , Saavedra G.
Published: December 2024

We study OSNR impact on Mach-Zehnder interferometers based on multicore fibers, noting visibility drops below 30 dB. To maintain QBER of 11% and 18% in 2D- and 4D-BB84 systems, OSNR needs to be 22.6 dB and 23.3 dB.
Experimental Study of Noise-like Pulse Emission under Single-shot Characterization
Authors: Bello-Jiménez M. , Flores-González J. L. , Hernández-Arriaga M.V. , López-Estopier R. , Navarro-Martínez Y. , Hernández-Escobar E. , Pottiez O. , Durán-Sánchez M. , Ibarra-Escamilla B.
Published: December 2024

A single-shot characterization of a passive mode-locked fiber laser based on nonlinear polarization rotation is experimentally demonstrated. Adjusting the intracavity polarization state enables noise-like pulse emission with a broad-bandwidth supercontinuum spectrum.
Passive and Active Dual Waveguides Produced by Femtosecond Laser Micromachining
Authors: de Rossi Wagner , Wetter Niklaus Ursus , Dipold Jessica , Bordon Camila D. S. , Vecchi Thiago F. , Kassab Luciana R. P.
Published: December 2024

Dual waveguides were produced with ultrashort laser pulses in doped heavy metal glasses, showing low loss in straight and curved geometries, and demonstrating laser amplification when doped with rare earth ions.
Boehmite/gold substrates for SERS-based detection of hormone hepcidin: COVID-19 hyperinflammation screening
Authors: Silva Bandeira Carla Carolina , Rayo Alape Julián Mateo , da Silva Martinho Herculano
Published: December 2024

We produced SERS-based nanostructured substrates for the detection hepcidin and artificial saliva, with a view to rapid screening for hyperinflammation by COVID-19. The promising results showed a signal amplification of more than 10 times.
Angle Laser Sensor Based On Bending a Mach-Zehnder Interferometer Constructed With a Tapered Microfiber
Authors: Huerta Arteaga D. A. , Salceda-Delgado G. , Ruiz-Robles M. A.
Published: December 2024

An angle laser sensor based on bending a Mach-Zehnder interferometer constructed with tapered microfiber is presented. Experimentally, it demonstrates a sensitivity of 0.05715 nm/° between -152° and -86°, showing potential application in engineering.
Simulation of lead-free perovskite solar cell based on MASnI3 compared with FAPbI3
Authors: Velez-Galvis Yeraldin , Echeverri-Perez Jefferson , Reyes-Vera Erick , Gonzalez-Valencia Esteban , Medina Byron , Sepulveda Alexander
Published: December 2024

This work uses COMSOL Multiphysics simulations to evaluate lead (FAPbI3) and lead-free (MASnI3) perovskite solar cells. A comparison of the main electrical parameters reveals that the lead-free cells exhibit good performance and pollute less.
Identification of antibiotic resistance susceptibility in different species of microorganisms implementing machine learning
Authors: Barrera-Patiño Claudia. P. , Soares Jennifer M. , Blanco Kate C. , Inada Natalia M. , Bagnato Vanderlei Salvador
Published: December 2024

Based in previous publish work [1], in this study, we highlight the importance of building robust machine learning foundations to differentiate antimicrobial resistance involving between gram-negative and gram-positive bacteria. This advance is crucial to be applied to clinical needs.
Characterizing Blood Vessels in Blood Flow Phantoms Using Spatial Angle Filter Imaging for Improved Imaging Depth in Light Scattering Media
Authors: Daliry Kiana , Zerai Fiona , Pandya Aditya , Douplik Alexandre
Published: December 2024

Our study uses Spatio-Angular Filtering (SAF) to achieve high-resolution imaging of blood vessels in a skin-like PDMS and TiO2 phantom, aiming for 3mm depth imaging to enhance cancer diagnostics and treatment in scattering media.
All-POF Spectral Filter Based on In-Line Holes
Authors: Anguiano-Lasso Mariana , Santiago-Hernández Héctor , Mora-Nuñez Azael , Bravo-Medina Beethoven , Beltran-Gonzalez Anuar , de la Cruz-González José Luis , Pottiez Olivier
Published: December 2024

We propose a spectral filter using a plastic optical fiber with micro-holes, offering a low-cost, robust, and highly reproducible solution. Transmission traces show a spectral blue shift in peak transmission at 587 nm, 567 nm, 556 nm, and 536 nm for fibers with zero, one, two, and three holes, respectively. The filter displays a bandpass period of approximately 120 nm. Additionally, we compare transmissions with holes spaced at 1 cm and 500 µm apart, finding that the hole spacing does not affect the spectral transmission. By filling the holes with glucose solutions of varying concentrations to change the refractive index, we find that the filtering band and spectral shape remain consistent, ensuring the stable and robust performance of our spectral filter.
Implementation of a Fiber Optic Sensor for Structural Vibration Monitoring
Authors: Pérez-Toalá Jesús , Gómez-Pérez Joel , Camas-Anzueto Jorge Luis , Grajales-Coutiño Rubén , Velasco-Bolom Pedro Marco , Guillén-Ruiz Luis Enrique
Published: December 2024

The proposal uses fiber optics to measure vibrations in a PVC beam. It evaluates single-mode and multi-mode fibers, measuring frequencies from 6 to 18 Hz, combining sensitivity and precision, ideal for vibration detection.
Hydrogen Sulfide Sensor Based on Plastic Optical Fiber Coated with Silver@Magnetite Nanoparticles
Authors: Lopez Juan D. , Silva Paulo , Dante Alex , Allil Regina , Werneck Marcelo
Published: December 2024

This study presents hydrogen sulfide (H2S) sensors based on plastic optical fiber (POF) coated with magnetite and silver@magnetite nanoparticles. The silver@magnetite-coated sensor displayed 12 times higher sensitivity when tested at 50 ppm of H2S.
Non-Invasive Helicobacter Pylori Detection via Mid-Infrared iHWG Sensor
Authors: Rangel Gabriela Flores , de León Martinez Lorena Diaz , Mizaikoff Boris
Published: December 2024

Helicobacter pylori infection is linked to gastrointestinal disorders, including gastric cancer, necessitating efficient detection technologies. This study evaluates substrate-integrated hollow waveguide (iHWG) sensors using mid-infrared Fourier-transform infrared (FTIR) spectroscopy for precise isotopic ratio measurement of ¹³CO₂ to ¹²CO₂ in simulated breath analysis conditions. Three iHWGs of varying lengths were tested, optimizing the gas-light interaction to enhance sensitivity. Results show high precision and stability, establishing the FTIR-iHWG system as a promising platform for non-invasive, miniaturized H. pylori detection tools.
Acoustic Levitation of Silica Spheres for the Detection of Metals Dissolved in Water by Laser-Induced Breakdown Spectroscopy
Authors: Meneses-Nava M.A. , Rodriguez M. , Maldonado J.L.
Published: December 2024

Detecting metals in water using LIBS faces challenges due to energy wastage. We propose acoustic levitation of silica spheres to address this issue. Benefits include ppb limit of detection, stability, repeatability and reduced time measurements. .
Development of Photosensitizers Based on Doped TiO2 Nanoparticles for Use in Antimicrobial Photodynamic Therapy
Authors: Lozano-Rosas Ricardo , Salazar-Morales Mayra F. , Ramos-Garcia Rubén , Spezzia-Mazzocco Teresita
Published: December 2024

Titanium dioxide (TiO2) doped with metal ions enhances antimicrobial photodynamic therapy (APDT). Doped TiO2 nanoparticles show photoactivity with visible light and increased antifungal efficacy against Candida albicans. This study includes synthesis, characterization, and application details.
On the Analysis of Photoacoustic Signals via Dynamic Mode Decomposition
Authors: Ramírez-Chavarría Roberto G. , Pérez-Pacheco Argelia , Quispe-Siccha Rosa
Published: December 2024

Photoacoustics is a promising technology in biomedicine. This work approaches a data-driven method to analyze the underlying dynamics of photoacoustic signals. We show the data workflow and promissory results to test the proposed technique.
Evidences of Photoacustics Effects in Microparticle Manipulation Using a CW Modulated Laser
Authors: Reyes-Barragán Sergio , Ruíz-Corona Ulises , Silva-Barranco Javier , Ramos-García Rubén
Published: December 2024

Photoacoustic pulses are generated by focusing a cw laser beam on a titanium nanofilm, to manipulate microparticles. The velocity of microparticles reported is much larger than those obtained by thermophoresis.
Monitoring of Nanostar Growth Using Optical Coherence Tomography and UV-Vis Spectroscopy
Authors: de León Yenisey Ponce , Pichardo-Molina Juan Luis , Ochoa Noé Alcalá , Ortiz-Gutiérrez Mauricio
Published: December 2024

Nanostar growth was monitored by Optical Coherence Tomography and spectroscopy. Plots for both techniques show similar behavior, confirming is possible monitoring the growth kinetics of nanoparticles using OCT imaging. Additionally, OCT allows detecting few nanoparticles.
Sensitivity of experimental conditions on inhomogeneous thin film growth
Authors: Rodriguez R. , Villa E. , Abundiz N. , Sanginés R. , Aguila J. , Terán E. , Cruz L. , Machorro R.
Published: December 2024

Fourier transform approximation is used to synthesize continuously changeable refractive index filters on a substrate. Its performance is sensitive to small variations of the involved deposition parameters. We study this dependence, numerically and experimentally.
Optically generated millimeter waves by selective filtering of multimode laser emission
Authors: Carmona-Suárez José , Gutiérrez-Martínez Celso
Published: December 2024

A 70 GHz millimeter wave (mm-wave) signal is generated by photomixing a pair of optically filtered adjacent modes from a multimode laser (MML). Selective filtering of MML is achieved by fiber optic photonics filters.
Ablation and Dynamic Distributions Exhibited by Lung Epithelial Cancer Cells Monitored by Chaotic Attractors
Authors: Torres-Torres Carlos , García-Pérez Blanca Estela , Martines-Arano Hilario
Published: December 2024

Changes in distribution of A549 cancer cells were identified by a straightforward single-beam measurement of a modulated optical transmittance. The assistance of a chaotic attractor improves the sensitivity dependent on resonant conditions of the sample.
Nanosecond-laser annealing of zinc oxide thin-films
Authors: Jain S. , Medlin W. , Uprety S. , Isaacs-Smith T. , Olsson T. , Davis J. , Burrows S. , Chumley S. , Park M. , Laurent Guillaume M.
Published: December 2024

In this work, we have investigated the role of both the laser wavelength and fluence on the crystallization of zinc oxide (ZnO) thin-films induced by nanosecond laser.
Sensor Based on U-Bent MMM Optical Fiber Structure for Detection of Mercury in Water
Authors: Gaviria-Calderón Arturo , Patiño-Jurado Brayan , Saldarriaga W. , Garcia-Sucerquia Jorge
Published: December 2024

In this work, U-Bent multimode-multimode-multimode (U-MMM) optical fiber structures for the detection of Hg2+ ions in water are evaluated. The U-MMM, fabricated via the immobilization of a chitosan/Fe2O3 layer in a coreless fiber section, can detect the presence of mercury ions in drinking water at low concentrations, by tracking the wavelength response of the structure.
Generation and Characterization of OAM Beams in the Partially Coherent Regime
Authors: Cardoso–Isidoro Carlos , Hernandez–Aranda Raul I. , Perez–Garcia Benjamin
Published: December 2024

We report an experimental approach for the characterization of structured partially coherent light by means of the measurement of the Cross Correlation Function, involving a Spatial Light Modulator illuminated by an extended thermal source.
Tunable Multi-Wavelength Fiber Laser Using a Mach-Zehnder Interferometer as a Wavelength-Selector Filter
Authors: Bueno-Gasca Adriana , Martinez-Ramirez Laura G. , Silva-Alvarado Erika C. , Gallegos-Arellano Eloísa , Estudillo-Ayala Julián M. , Rojas-Laguna Roberto , Hernández-Romano Iván , Sierra-Hernandez Juan M.
Published: December 2024

This work presents a tunable multi-wavelength erbium-doped fiber using a Mach-Zehnder interferometer (MZI) as a wavelength-selective filter (WSF). By applying curvature to the MZI, a laser emission from 1552.41 nm to 1557.29 nm was tuned.
Guiding Trojan Beams via Lagrange Points
Authors: Lou Haokun , Wei Yunxuan , Wu Fan. O. , Pirialakos Georgios G. , Christodoulides Demetrios N. , Khajavikhan Mercedeh
Published: December 2024

A new mechanism for guided wave transport, based on stable Lagrange points, is introduced. The concept can be applied to both optical signals and charged particle beams. This approach can, for the first time, enable the propagation of charged particles in a guided fashion.
Qubint-4Lexp: Interactive Tool for the Four Bell States
Authors: Vidales-Basurto C.A. , Villegas-Martínez B.M. , Gesing S. , Fahara-Ojeda G.S. , Rodríguez-Arias M. , Contreras-Sepúlveda W.
Published: December 2024

We present Qubint-4Lexp, an integrated educational tool designed to illustrate fundamental concepts of the four Bell states in quantum computing. This tool is freely available and has already been integrated into the QUBITHUB platform.
Characterizing Breast Tissue Samples with Integrated Imaging
Authors: Douplik Alexandre , Moradi Shahram , D’Ippolito Alexander , Dingle Kate , Michel Marius , Easson Alexandra
Published: December 2024

A method was developed to distinguish cancerous from non-cancerous breast tissue using white and UV light imaging, analyzing fluorescence intensity. Pathologist-marked images confirmed accuracy, optimizing tissue thickness for transmission mode analysis.
Potential of Bloch surface wave sensors for refractive index sensing
Authors: Gonzalez-Valencia Esteban , Reyes-Vera Erick , Velez-Galvis Yeraldin , Torres Pedro
Published: December 2024

This work reviews recent progress and developments of fiber optic configurations for exciting Bloch surface waves (BSWs), which represent the most advanced and developed refractive index sensing technology.
Towards Coherent Control of Charge Carriers in Back Gated Graphene
Authors: Antonio Braulio , Nunzi Jean-Michel
Published: December 2024

In this work we show a mechanism to achieve coherent control of optically injected current in gated single layer graphene, using a two-colored optical field at ω and 2ω (808 nm and 404 nm).
Fusing Computed Tomography Image Spectrometry and Convolutional Neural Networks for Biological Tissue Classification
Authors: Magdaleno-Martinez G. , Narea-Jiménez F. , Castro-Ramos J.
Published: December 2024

A computed tomography imaging spectrometer (CTIS) was used to distinguish between biological tissues of animal and human origin, following a compressed learning framework with a convolutional neural network (CNN) architecture, directly on raw CTIS images.
Classification of Rugosity in Plasmonic Metallic Thin Films Using Deep Learning for Speckle Images
Authors: Magaña-Barocio C.N. , Gonzalez Marlen , Peña-Gomar M.C. , Torres.Cisneros M. , Rodriguez-Sanchez A.E.
Published: December 2024

In this work, we report, for the first time, to the best of our knowledge, the classification of metallic samples with different roughness values. As a reference, the Ra and Rq values were obtained using a Mitutoyo roughness meter. About 2,000 Speckle images were obtained for each sample. They were processed and used as inputting neural networks such as ResNet50 and EfficientNet. We obtained 99.63 % accuracy in classifying the samples with the ResNet50 model and 99.48 % accuracy for the EfficientNet model. These accuracies can be compared with the 99.926 % and 99.932 % values obtained for aluminum and steel surfaces in a similar work that used an optics system, image processing, and a CNN.
Method for Finding Leaf Layers in Optical Coherence Tomography Images
Authors: Lomán Córdova José Eduardo , de León Yenisey Ponce , Cerecedo Núñez Héctor Hugo , Sosa Patricia Padilla , Iturbe Castillo Marcelo David , Aguilar Dora Trejo , Ortiz-Gutiérrez Mauricio
Published: December 2024

A procedure for determining leaf layers in Optical Coherence Tomography images is proposed. By analyzing coffee leaves, three layers were successfully identified. The same procedure was applied to avocado and mango leaves for verification.
Fractional photobiomodulation on breast cancer, is it a new therapy?
Authors: Franco-Pastrana S. , Alvarez-Delgado C. , Spezzia-Mazzocco T.
Published: December 2024

Breast cancer is the main cause of death in women. Breast adenocarcinoma and fibroblasts cells were used to test photobiomodulation therapy continuously and fractional. The fractional dose reduces cancer cells. Possible alternative treatment.
Fabrication and characterization of a carbon nanotube saturable absorber for passive mode-locking
Authors: Taina Ramírez C. , Jaime Cascante V. , Esteban Avendaño S. , Mavis Montero V.
Published: December 2024

In this research we report the characterization of a passive modulator using single walled carbon nanotubes in sodium carboxymethyl cellulose as a host polymer. The results show that this saturable absorber has a modulation depth of αs = 32% , saturation intensity of Is = 114.9 MW/cm2 and recovery time of τs = 240 fs.
High-resolution compressive 3D imaging through phase ranging with a single-pixel photodetector
Authors: Li Xiaotian , Hu Yetong , Zhang Zilong , Zhang Zhijian , Yang Zehou , Zhou Dingfu , He Wei , Wang Yuqi , Ma Yunfei , Ke Jun , Zhao Changming
Published: December 2024

Single-pixel three-dimensional (3D) imaging is of great potential to the light detection and ranging (Lidar) system. Combining high-precision ranging with compressed sensing (CS) imaging enables the acquisition of high-resolution and accurate depth maps under non-scanning conditions. In this study, we present that a phase ranging system can be combined perfectly with the CS algorithm perfectly for real 3D imaging through only two reconstructions, along with high accuracy and fast depth measurement. A structured detection architecture based on amplitude-modulated continuous-wave laser illumination and single-pixel detector with high-precision 3D image reconstruction at 128 × 128 resolution using only a 5% sampling rate were used. The minimum identifiable target width of this system is 0.2 cm, corresponding to a resolving angle of 0.33 mrad. This system paves the reality of high-precision and fast 3D imaging for continuous-wave Lidar detections.
Highly efficient fiber Bragg grating spectrometer fabricated with violet and near-infrared femtosecond laser pulses and the phase mask technique
Authors: Rahnama Abdullah , Hnatovsky Cyril , Lausten Rune , Walker Robert B. , De Silva Kasthuri , Mihailov Stephen J.
Published: December 2024

All-fiber visible spectrometers with a sub-nanometer resolution and record-high light outcoupling (70%) are fabricated using violet (400 nm) and near-infrared (800 nm) femtosecond laser pulses and the phase mask technique. The spectrometers are based on highly localized uniform Bragg gratings produced by tightly focusing the femtosecond pulses into the core of visible single-mode fibers. The unique nanoscale morphology of the resultant Bragg gratings ensures very strong outcoupling of light from the fiber, while bending of the fiber provides the focusing capability to define an efficient all-fiber spectrometer.
Rapid modulation bandwidth test system of micro-LED based on photon excitation
Authors: Niu Qingxiang , Hong Yongsheng , Jin Hui , Tao Tao , Xu Feifan , Zhi Ting , Dou Rongrong , Xie Zili , Zhuang Zhe , Yan Yu , Chen Wenjuan , Qu Cheng , Bi Wengang , Liu Bin
Published: December 2024

Modulation bandwidth is essential for micro-LED in visible light communication systems. The traditional electroluminescence-based bandwidth test system (EL-BW-Test) is time-consuming and inevitably causes irreversible damage. This paper introduces the design and construction of a novel, to the best of our knowledge, photon-excited bandwidth testing system (PL-BW-Test), capable of swiftly acquiring the bandwidth of LED epi-wafers and devices. Comparison and experimental results demonstrated that the LED bandwidth measurements obtained via PL-BW-Test exhibit consistency with those acquired through EL-BW-Test, particularly concerning the excitation intensity and quantum well structure. The newly invented system presents several advantages including easy operation, broad applicability, and non-destructiveness, offering an innovative approach to an efficient, non-contact modulation bandwidth measurement.
Exploring the factors that mediate the relationship between accounting ethics and financial reporting quality among MSMEs
Authors: Ahmed Ibrahim Anyass , Anaman Prince Dacosta , Cudjoe Mawuena Akosua , Akyen Benjamin , Donkor Christian
Published: December 2024

This study aims to investigate the impact of accounting ethics on the quality of financial reporting of MSMEs in Ghana, a sector vital to economic stability. Given the critical role of MSMEs in the Ghanaian economy, there is an urgent need to establish ethical financial practices that promote transparency and sustainability in the sector.Using Stakeholder Theory, thisstudy specifically examines how variables of ethical leadership, employee motivation, training and education, regulatory environment, technology solutions, and internal controls affect this relationship.Data were collected from 368 participants in 100 MSMEs from the Central Region of Ghana using a quantitative approach and a standardized questionnaire based on a five-point Likert scale. The main analytical tool for data analysis is Structural Equation Modeling (SEM) with SMART PLS 4. The results of this study indicate that accounting ethics has a significant effect on the quality of financial reporting of MSMEs in Ghana. Ethical leadership, training and education, and employee motivation significantly mediate the relationship between accounting ethics and financial reporting quality of MSMEs in Ghana.Meanwhile, internal control, technology solutions, and regulatory environment do not significantly mediate the relationship between accounting ethics and financial reporting quality of MSMEs in Ghana. This study offers useful insights into the significance of accounting ethics in improving the integrity of financial reporting of MSMEs in Ghana.
COLLABORATIVE GOVERNANCE DALAM PENGELOLAAN SAMPAH DI KABUPATEN BANYUMAS
Authors: Islamiati Dita
Published: December 2024

Kabupaten Banyumas pernah mengalami darurat sampah pada tahun 2018, berawal dari kondisi tersebut Pemerintah Kabupaten berbenah dengan melakukan inovasi. Inovasi yang dilakukan oleh Kabupaten Banyumas menjadidalam perjalanannya dapat menjadi percontohan nasional dalam pengelolaan sampah yang dilakukan dengan kolaborasi antara pemerintah, swasta dan masyarakat. Lokasi penelitian ini dilakukan di Kabupaten Banyumas. Tujuan dari penelitian ini untuk mengkaji apa indikator keberhasilan collaborative governance dalam pengelolaan sampah di Kabupaten Banyumas. Metode penelitian ini menggunakan metode penelitian kualitatif. Sasaran dari penelitian ini adalah pemerintah, swasta dan masyarakat. Sumber data diperoleh dari sumber primer dan sekunder.Hasil penelitian menunjukkan faktor yang mempengaruhi keberhasilan penerapan collaborative governance dalam pengelolaan sampah di Kabupaten Banyumas adalah network structure, commitment to common purpose, governance, information sharing.Kata kunci : collaborative governance, pengelolaan sampah
Antibacterial effect of aqueous extract of Syzygium Aromaticum and floxacin against gram negative and positive bacteria: an in-vitro study
Authors: Al-Oudah GA , Hindi NKK , Al-Shalah LAM , Jalil Ewadh RM , Mohammed SM
Published: December 2024

Syzygium aromaticum is an antibacterial activity against various pathogenic microorganisms. A broad range of anti-disease activities estimate its potential therapeutic uses in treating numerous infectious disorders. The study aims to understand better how Syzygium aromaticum extract inhibits human pathogenic bacteria and demonstrate how the extract works to prevent the formation of bacterial biofilms and adhesion. The antibacterial action of the aqueous extract of Syzygium aromaticum was evaluated by using disc diffusion and the assay Agar-well diffusion. Its efficacy was compared with the antibiotic and determined. Additionally, tests on adherence and biofilm formation were conducted. All bacteria isolated from gram-negative (G -ve) and gram-positive (G +ve) bacteria were sensitive to Syzygium aromaticum extract and the range of inhibition zone (20 to 28) mm. Most isolated bacteria were sensitive to floxacin. Most bacterial isolates of Gram-negative bacteria exhibited Moderate adherence and biofilm activity to these extracts. Some bacteria isolates exhibited high adherence and biofilm activity to aquatic extracts of Syzygium aromaticum. The studys' findings were that the extracts from Syzygium aromaticum were highly effective against a variety of G-positive and G-negative isolated clinically, suggesting that they are superior to antibiotics sold in stores. Apart from strong resistance to adhesion and biofilm development.
Biopriming of seeds with microbial biostimulant (Bacillus megaterium ) on improvement of seedling growth, biochemical and root traits of rice (Oryza sativa L.)
Authors: Vaishnavi D , Ravichandran V , Sritharan N , Anandakumar S , Prabu Kumar G , Latha MR
Published: December 2024

This study aimed to evaluate the potential of Bacillus megaterium in improvingseed germination and rice seedling's morpho-physiological andbiochemical traits. The experiment was conducted using a completely randomizeddesign to evaluate the effect of different concentrations of the biostimulantB. megaterium on rice seedlings growth and development undernursery conditions. Biopriming seeds with B. megaterium significantly enhancedseed germination and seedling traits, such as seedling shoot androot length, seedling height, number of leaves, seedling vigor, and shootand root dry biomass, compared to the untreated control. Among the treatments,biopriming seeds with B. megaterium at a concentration of 10g kg-1resulted in the greatest improvements across all the recorded parameters.Root traits such as total root length, surface area, average root diameter,root volume, and root tips and forks were also significantly enhanced. Additionally,biochemical changes like total chlorophyll and soluble protein contentshowed notable improvements with the concentration of B. megaterium. Hence, these results suggest that biopriming seeds with B. megateriumare an efficient strategy to improve seed germination and shoot and rootvigor in rice seedlings.