Article
Engineering, Electrical & Electronic
Zhao Rong, Xuewen Shu, Zuowei Xu
Summary: An integrated structure for measuring curvature and temperature simultaneously in a single mode fiber was proposed and demonstrated. The device includes an in-fiber Mach-Zehnder interferometer and a fiber Bragg grating fabricated using femtosecond laser direct writing. It shows high sensitivity for curvature sensing and consistent temperature response, making it attractive for practical engineering monitoring and somatosensory posture recognition.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2021)
Article
Engineering, Electrical & Electronic
Mousumi Bose, Jason Hagerty, Jason Boes, Chang-Soo Kim, William V. Stoecker, Paul Nam
Summary: Based on photoluminescence quenching, optical oxygen sensors have been developed for continuous monitoring of oxygen in various applications. A simple and cost-effective fabrication technique was used to create sensor arrays capable of two-dimensional oxygen tension measurement. The sensors showed fast and repetitive response to oxygen concentrations, with high linearity and sensitivity in a Stern-Volmer plot.
IEEE SENSORS JOURNAL
(2021)
Article
Optics
Andreas Peckhaus, Fabian Elsaesser, Stefan Backfisch, Thomas Hall, Frank Duschek
Summary: The outdoor operation of multi-kilowatt high-power lasers can pose potential hazards to the human eye and skin due to scattered radiation. The current laser safety standards do not adequately consider atmospheric off-axis scattering and the dynamic interaction between the laser beam and the target object. Experimental studies are therefore necessary to provide quantitative information on scattered radiation for comprehensive laser safety evaluations.
OPTICS AND LASER TECHNOLOGY
(2024)
Article
Engineering, Electrical & Electronic
Francesco Anelli, Andrea Annunziato, Mike Godfrey, Antonella Maria Loconsole, Christopher Holmes, Francesco Prudenzano
Summary: A high curvature flexible Bragg grating was designed, fabricated, and characterized using silica glass. The curvature sensing mechanism for slightly off-axis core was explained theoretically and demonstrated experimentally. The electromagnetic behavior of the sensor was investigated using conformal mapping, modal analysis, and coupled-mode theory. The reflection spectrum and the relationship between resonant wavelengths and curvature were measured for a large curvature range.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2023)
Article
Engineering, Multidisciplinary
Sheng Hu, Shuai-ke Li, Yong Zhao
Summary: In this paper, a curvature sensor based on 2-core fiber offset structure is proposed. It has been experimentally proven that the sensor has good curvature sensing performance, the ability to identify one-dimensional bending direction, and is insensitive to strain and twist. This sensor has a wide range of applications.
Article
Materials Science, Paper & Wood
Dipankar Das, Jayanta Das, Ajit Debnath, Santanu Chakraborty, Biswajit Saha
Summary: Polyaniline-graphite (PANI-Graphite) composite deposited on cellulose paper substrate was studied for the development of a glucose biosensor kit. The physical characterizations of the prepared samples were carried out, and the sensing responses of glucose with different concentrations were observed. The results indicate that PANI-Graphite on cellulose would be a potential candidate for glucose concentration detection due to its lightweight, low cost, flexibility of a paper-based kit, and biodegradability.
Article
Optics
Fangcheng Shen, Xuewen Shu, Kaiming Zhou, Haiming Jiang, Hongyan Xia, Kang Xie, Lin Zhang
Summary: A sensitive vector twist sensor using a small period long period fiber grating (SP-LPFG) fabricated with a femtosecond laser is proposed and demonstrated. The sensor relies on monitoring the polarization dependent peaks in the transmission spectrum, allowing for high twist sensitivity.
CHINESE OPTICS LETTERS
(2021)
Article
Materials Science, Multidisciplinary
Dipankar Das, Jayanta Das, Ajit Debnath, Santanu Chakraborty, Biswajit Saha
Summary: This study develops flexible electronic materials of polyaniline (PANI) that chemically interact with Na2S, aiming to improve and tune their electrical transport properties and optical properties. The chemical interaction between Na2S and PANI leads to an increase in resistivity with the increase of Na2S concentration. The emeraldine form of partially polymerized PANI shows an excellent positive temperature coefficient of resistance, which is technologically significant for self-controlled overheating protection of electronic devices.
Article
Engineering, Electrical & Electronic
A. M. Shakra, I. S. Yahia, S. S. Shenouda
Summary: A thin film (215 nm) of indigo dye was deposited on a polymer substrate (polyacetate) through thermal evaporation. The structure of the film was analyzed using X-ray diffraction and found to be either X-ray amorphous or fine nanocrystalline. Analysis of the absorption coefficient revealed two indirect optical transitions with energy gaps (2.45 and 1.64 eV) in addition to the substrate gap (3.5 eV). Refractive index values were calculated using four different methods, with average values of 2.525 and 2.871 near the first and second absorption edges, respectively. The film's nonlinear optical susceptibilities and nonlinear refractive index were found to be in the same order of magnitude as other promising organic materials, making indigo-thin films suitable for flexible organic electro-optical applications.
OPTICAL AND QUANTUM ELECTRONICS
(2023)
Article
Chemistry, Analytical
Adam C. Funnell, Peter James Thomas
Summary: This paper presents a flexible weight sensor that utilizes optical fibre macrobending loss with 1550 nm wavelength light and small fibre bending path lengths. An applied load on the sensor causes a increase in the optical loss of the fibre, which is achieved by depressing an impactor layer of cylindrical protrusions into a soft mat covered with optical fibre. Experimental study shows the effect of different fiber types, impactor materials, impactor designs, and protrusion bend radii on the optical loss.
Review
Chemistry, Multidisciplinary
Ying Yi, Bo Wang, Xingyue Liu, Changping Li
Summary: This article introduces recent advancements in the development of flexible piezoresistive strain sensors based on carbon nanotubes-polymer composites, focusing on their electromechanical properties. Various fabrication approaches and material preparation methods are discussed, as well as the working principle of the sensors. The article highlights the great potential of CNTs-polymer composites for flexible, skin-mountable, and wearable electronics applications, while also addressing possible challenges for future developments.
Article
Chemistry, Analytical
Xin Guan, Yunlong Yu, Zhaonan Hou, Ke Wu, Hongran Zhao, Sen Liu, Teng Fei, Tong Zhang
Summary: Self-supported polymer films were fabricated using the thiol-ene click cross-linking reaction and utilized as both the substrate and humidity-sensing material for humidity sensors. By optimizing the hydrophilic monomer content, the sensitivity and response speed of the sensors were improved. The prepared flexible sensors exhibited good stability under bending and long-term tests.
SENSORS AND ACTUATORS B-CHEMICAL
(2022)
Article
Engineering, Electrical & Electronic
Hao Wang, Zifen Zhao, Panpan Liu, Xiaogang Guo
Summary: This paper proposes a one-step fabricated laser-induced graphene (LIG) system that has the advantages of low cost, patterning of various geometries, and high sensitivity. The use of a substrate composed of polydimethylsiloxane (PDMS) and polyimide (PI) allows the LIG-based sensors to fit complex 3D structures and withstand mechanical tension. The fluence of the laser is determined as the sole principle to characterize the formation of conductive LIG, simplifying the selection of laser scanning parameters for desired LIG-based devices. Three demonstrations highlight the superiority and potential of this soft and stretchable LIG-based system in wearable electronics and soft robots.
NPJ FLEXIBLE ELECTRONICS
(2022)
Article
Engineering, Multidisciplinary
Qiuyu Wang, Chao Du, Shuang Zhao, Bin Jia, Li Zhang, Liqin Cui, Xiaoyan Yun, Xiao Deng
Summary: This paper investigates a D-shape fiber long period fiber grating (DLPFG) curvature sensor through theoretical and experimental research. The fabrication process of DLPFG is different from previous D-shape single mode fiber (SMF) based long period fiber grating (LPFG) curvature sensors, with a two-step process involving LPFG writing and subsequent polishing. The DLPFG exhibits high curvature sensitivity and promising temperature sensitivity, making it an ideal candidate for curvature measurement.
Article
Chemistry, Physical
Zhenkun Gu, Ying Wang, Shiheng Wang, Ting Zhang, Rudai Zhao, Xiaotian Hu, Zhandong Huang, Meng Su, Qun Xu, Lihong Li, Yiqiang Zhang, Yanlin Song
Summary: A facile method to print large-scale perovskite films with high quality for flexible photodetectors is reported in this study, by introducing a soluble polyethylene oxide (PEO) layer during the inkjet printing process to control the nucleation and crystal growth of perovskite. The printed perovskite films show excellent mechanical performance and high quality, opening up new opportunities for the fabrication of diverse wearable optoelectronic devices.
Article
Optics
Sean Hooten, Nicolas M. Andrade, Ming C. Wu, Eli Yablonovitch
Summary: The paper introduces a metal-dielectric antenna design that eliminates the tradeoff between spontaneous emission enhancement and radiative efficiency, greatly enhancing the rate of spontaneous emission. Additionally, this design strategy is suitable for short-distance optical communications applications.
Article
Engineering, Electrical & Electronic
Philip Jacobson, Mizuki Shirao, Kerry Yu, Guan-Lin Su, Ming C. Wu
Summary: This article introduces a novel hybrid scheme of photonic delay-based reservoir computers (RC) that preprocess input data through convolutional layers and then process them through an optoelectronic implementation of delay-based RC. Experimental results show that the proposed scheme achieves comparable classification performance to state-of-the-art machine learning algorithms and significantly reduces model training time.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
Article
Chemistry, Multidisciplinary
Konthoujam James Singh, Hao-Hsuan Ciou, Ya-Hui Chang, Yen-Shou Lin, Hsiang-Ting Lin, Po-Cheng Tsai, Shih-Yen Lin, Min-Hsiung Shih, Hao-Chung Kuo
Summary: This paper investigates the coupling of excitons in tungsten diselenide monolayer with a one-dimensional photonic crystal at room temperature, and demonstrates the manipulation of circular dichroism and circularly polarized light emissions through the integration of TMDs and photonic crystal. The study holds potential for applications in optical information technology, biosensing, and optoelectronic devices.
Article
Crystallography
Catherine Langpoklakpam, An-Chen Liu, Kuo-Hsiung Chu, Lung-Hsing Hsu, Wen-Chung Lee, Shih-Chen Chen, Chia-Wei Sun, Min-Hsiung Shih, Kung-Yen Lee, Hao-Chung Kuo
Summary: This paper reviews the superior properties of SiC power devices and their applications in various power applications. SiC MOSFETs have been extensively commercialized due to their low on-resistance, reduced switching losses, and high switching speeds.
Article
Physics, Applied
Mizuki Shirao, Daniel Klawson, Sara Mouradian, Ming C. Wu
Summary: A one-dimensional focusing grating coupler array based in silicon nitride (SiN) was proposed for trapped ion qubit manipulation. The design was optimized to achieve high directionality, small beam diameter, and low crosstalk. Additionally, the impact of fabrication errors on system performance was also investigated through simulation analysis.
JAPANESE JOURNAL OF APPLIED PHYSICS
(2022)
Article
Multidisciplinary Sciences
Xiaosheng Zhang, Kyungmok Kwon, Johannes Henriksson, Jianheng Luo, Ming C. Wu
Summary: The paper presents a 16,384-pixel LiDAR sensor with wide field of view, high resolution, narrow beam divergence, and fast operation speed. The sensor can be mass-produced and used in various applications such as autonomous cars, drones, robots, and smartphones.
Article
Multidisciplinary Sciences
Yuan-Fong Chou Chau, Hao-En Chang, Po-Sheng Huang, Pin Chieh Wu, Chee Ming Lim, Li-Ming Chiang, Tzyy-Jiann Wang, Chung-Ting Chou Chao, Tsung Sheng Kao, Min-Hsiung Shih, Hai-Pang Chiang
Summary: This study demonstrates a tunable ferroelectric lithography plasmon-enhanced substrate to generate photo-reduced silver nanoparticles (AgNPs) and achieve enhanced photoluminescence (PL) with shortened lifetime. This effect can be attributed to the localized electromagnetic wave produced by the nanotextured AgNPs layers' surface and gap plasmon resonances.
SCIENTIFIC REPORTS
(2022)
Article
Materials Science, Multidisciplinary
Hsiang-Ting Lin, Chiao-Yun Chang, Cheng-Li Yu, Andrew Boyi Lee, Shih-Yu Gu, Li-Syuan Lu, Yu-Wei Zhang, Shih-Yen Lin, Wen-Hao Chang, Shu-Wei Chang, Min-Hsiung Shih
Summary: This study investigates dual-color continuous-wave microcavity lasers by integrating WSe2 monolayer and CdSe quantum dots into a single microdisk cavity. The results show that adding CdSe quantum dots can reduce the laser threshold of WSe2 monolayer and expand the wavelength range of TMDC-based compact lasers.
ADVANCED OPTICAL MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Yuan-Fong Chou Chau, Hao-En Chang, Po-Sheng Huang, Pin Chieh Wu, Tzyy-Jiann Wang, Chung-Ting Chou Chao, Muhammad Raziq Rahimi Kooh, Tsung Sheng Kao, Min-Hsiung Shih, Hai-Pang Chiang
Summary: This work fabricates a plasmonic lithium niobate substrate with metal nanoparticles (MNPs) to enhance photoluminescence and reduce lifetime, and it explores the potential influence of surface plasmon coupling on the photoluminescence reactions.
RESULTS IN PHYSICS
(2022)
Article
Chemistry, Multidisciplinary
Ya-Hui Chang, Yen-Shou Lin, Konthoujam James Singh, Hsiang-Ting Lin, Chiao-Yun Chang, Zheng-Zhe Chen, Yu-Wei Zhang, Shih-Yen Lin, Hao-Chung Kuo, Min-Hsiung Shih
Summary: A multicolor AC-driven light-emitting device was developed by integrating a WSe2 monolayer and AlGaInP-GaInP multiple quantum well (MQW) structures. The CVD-grown WSe2 monolayer was placed on top of an AlGaInP-based LED wafer to create a two-dimensional/three-dimensional heterostructure. These hybrid devices expand the wavelength range of 2-D TMDC-based light emitters and support their implementation in various applications.
Article
Chemistry, Multidisciplinary
Shang-Yang Yu, Min-Hsiung Shih, Yun-Cheng Ku, Yi-Han Kuo, Jiunn-Woei Liaw
Summary: A water-immersion laser-scanning annealing method was developed to improve the crystallinity and optical properties of a deposited polycrystalline Au film, resulting in reduced optical losses, increased sensitivity, and improved performance for biosensors.
Article
Materials Science, Multidisciplinary
James Singh Konthoujam, Yen-Shou Lin, Yi-Hua Pai, Chiao-Yun Chang, Yu-Wei Zhang, Shih-Yen Lin, Hao-Chung Kuo, Min-Hsiung Shih
Summary: This study reports a significant enhancement in the modulation bandwidth of visible light communication (VLC) by integrating a two-dimensional semiconductor and quantum dots emitter. By integrating a WSe2 monolayer into an Au-nanorod-decorated CdSe/ZnS quantum dots emitter, high modulation performance is achieved. The hybrid quantum dot-gold-tungsten disulfide (QD-Au-WSe2) emitter exhibits a higher modulation bandwidth (130 MHz) compared to pristine quantum dots and a QD-WSe2 heterostructure without Au nanorods (79 and 91 MHz, respectively). The increased transition rate of quantum dot excitons is attributed to the integration of Au nanorods and WSe2 monolayer, which is supported by a reduction in average carrier lifetime observed from time-resolved photoluminescence analysis. This approach and findings provide an opportunity for the application of two-dimensional semiconductors in next-generation miniature VLC devices for high-speed optical communications.
ADVANCED PHOTONICS RESEARCH
(2023)
Article
Optics
Guan-Hong Li, Chieh Huang, Feng-Jung Kao, Min-Hsiung Shih, Hao-Chung Kuo, Yi-Jen Chiu, Chao-Kuei Lee
Summary: In this study, supercontinuum generation from 645.3 nm to 851 nm was demonstrated by using a high-order mode and engineering the dispersion within the high nonlinear refractive index material Ta2O5 waveguide. The results show clear potential for applications.
OPTICS AND LASER TECHNOLOGY
(2024)
Article
Nanoscience & Nanotechnology
James Singh Konthoujam, Yen-Shou Lin, Ya-Hui Chang, Hsiang-Ting Lin, Chiao-Yun Chang, Yu-Wei Zhang, Shih-Yen Lin, Hao-Chung Kuo, Min-Hsiung Shih
Summary: We developed a dual-color AC-driven light-emitting device by integrating WSe2 monolayer and AlGaInP-GaInP multiple quantum well structures with an AlOx insulating layer as a capacitor structure. We investigated the device characteristics using an equivalent RC circuit model and analyzed the time-resolved electroluminescence to understand the underlying physical mechanisms. This dual-color hybrid device expands the applications of 2-D TMDC-based light emitters.
Article
Chemistry, Multidisciplinary
Hsiang-Ting Lin, Yao-Yu Hsu, Pi-Ju Cheng, Wei-Ting Wang, Shu-Wei Chang, Min-Hsiung Shih
Summary: In this study, in situ optical chirality tunable nanorod trimer metasurfaces were demonstrated, which could control the degree of circular polarization of transmitted wave by adjusting the gap distances between nanorods and the manipulation of localized surface plasmon resonance (LSPR) coupling. These fabricated chiral metasurfaces can be used as important elements for chip-scale flexible optoelectronic integrated circuits in sensing, display, and communication applications.
NANOSCALE ADVANCES
(2022)
