Results 71 to 80 of about 120,968 (283)

Long-period gratings in polymer ridge waveguides

Optics Express, 2005
We report the design and fabrication of long-period waveguide gratings (LPWGs) in benzocyclobutene (BCB) ridge waveguides. We apply an accurate perturbation theory to analyze the LPWGs. In particular, the phase-matching condition, the coupling coefficients, the temperature dependence of the resonance wavelength, the bandwidth, and the polarization ...
Q, Liu, K, Chiang, K, Lor
openaire   +2 more sources

Spectrally Tunable 2D Material‐Based Infrared Photodetectors for Intelligent Optoelectronics

Advanced Functional Materials, EarlyView.
Intelligent optoelectronics through spectral engineering of 2D material‐based infrared photodetectors. Abstract The evolution of intelligent optoelectronic systems is driven by artificial intelligence (AI). However, their practical realization hinges on the ability to dynamically capture and process optical signals across a broad infrared (IR) spectrum.
Junheon Ha, Yingshan Ma, Yong Nam An, Sung‐Un An, Hyeon Hak Jung, Suvi‐Tuuli Varjamo, Jiwon Yoo, Junho Min, Hanvit Kim, Faisal Ahmed, Sang Hoon Chae, Young Min Song, Weiwei Cai, Tawfique Hasan, Zhipei Sun, Dong‐Ho Kang, Hyeon‐Jin Shin, Yunyun Dai, Hoon Hahn Yoon   +18 more
wiley   +1 more source

Chirped gratings in integrated optics [PDF]

, 1977
Gratings with variable periods (chirped gratings) have been fabricated by recording the interference pattern of a collimated laser beam with a converging beam generated by a cylindrical lens.
Katzir, A., Livanos, A. C., Shellan, J. B., Yariv, A.   +3 more
core   +1 more source

Broadband, Flexible, Skin‐Compatible Carbon Dots/Graphene Photodetectors for Wearable Applications

Advanced Functional Materials, EarlyView.
Broadband, flexible photodetectors integrating nitrogen‐rich carbon dots with single‐layer graphene on plastic substrates are demonstrated. A biocompatible chitosan–glycerol electrolyte enables efficient low‐voltage gating and on‐skin operation. The devices exhibit ultraviolet‐to‐near‐infrared response, mechanical robustness under bending, and verified
Nouha Loudhaief, Petr Rozhin, Ilaria Bertuol, Ali Raza, Leonardo Viti, Subhankar Roy, Enrico Cavarzerani, Luca Sbuelz, Matteo Brilli, Andrea Serinolli, Jacopo Nicoletti, Riccardo Piccoli, Sebastián Castilla, Simone Dal Zilio, Enrique Rodríguez‐Castellón, Miriam Serena Vitiello, Maurizio Selva, Flavio Rizzolio, Alvise Perosa, Giovanni Antonio Salvatore, Domenico De Fazio   +20 more
wiley   +1 more source

Long-Period Grating with Asymmetrical Modulation for Curvature Sensing

Applied Sciences
We propose and demonstrate a curvature sensor based on long-period fiber grating (LPFG) with asymmetric index modulation. The LPFG is fabricated in single-mode fiber with femtosecond laser micromachining.
Lan Su, Xin Qiu, Rui Guo, Youbo Jing, Chaoshan Yang, Shuhui Liu   +5 more
doaj   +1 more source

Scalable Thermal Engineering via Femtosecond Laser‐Direct‐Written Phononic Nanostructures

Advanced Functional Materials, EarlyView.
This study demonstrates that femtosecond laser‐induced periodic surface structures (fs‐LIPSS) can function as phononic metasurfaces, reducing thermal conductivity below the plain thin‐film limit. Phonon Monte Carlo analysis reveals that the periodic structures restrict phonon mean free paths.
Hiroki Hamma, Roman Anufriev, Kazuyoshi Fushinobu, Masahiro Nomura, Byunggi Kim   +4 more
wiley   +1 more source

Sensing Characteristics of Side-Hole Fiber-Based Long-Period Grating

Advances in Materials Science and Engineering, 2013
Long-period gratings (LPGs) have been fabricated in a side-hole fiber (SHF) by using a pulsed CO2 laser. Sensing characteristics of this SHF-LPG to temperature surrounding refractive index and bend have been investigated.
Yi Xin, Xinyong Dong, Junwei Yuan, Yi Li, Shangzhong Jin, Sulei Zhang   +5 more
doaj   +1 more source

An Ultrasensitive Long-Period Fiber Grating-Based Refractive Index Sensor with Long Wavelengths

Sensors, 2016
The response of a novel long-period fiber grating (LPFG) with a period of 180 µm to a surrounding refractive index (RI) was investigated. The results displayed that, with the increase in RI of the surrounding media of cladding glass in the grating region,
Qiu-Shun Li, Xu-Lin Zhang, Jian-Guo Shi, Dong Xiang, Lan Zheng, Yan Yang, Jun-Hui Yang, Dong Feng, Wen-Fei Dong   +8 more
doaj   +1 more source

Design and Experimental Analysis of Micropolarization Array Based on a Long-Wave Infrared Optical System

Applied Sciences, 2022
Aiming at the shortcomings of the traditional infrared polarization imaging device, such as large volume, complex structure, difficult registration, and inability to recognize moving targets, this paper proposes an infrared polarization imaging method ...
Qiang Fu, Yue Zhang, Yi Liu, Haodong Shi, Su Zhang, Juntong Zhan, Yingchao Li, Huilin Jiang   +7 more
doaj   +1 more source

Large bandwidth, highly efficient optical gratings through high index materials [PDF]

, 2008
We analyze the diffraction characteristics of dielectric gratings that feature a high index grating layer, and devise, through rigorous numerical calculations, large bandwidth, highly efficient, high dispersion dielectric gratings in reflection ...
Baldry, Clausnitzer, Clausnitzer, Clausnitzer, Ebizuka, Gibson, H. L. Offerhaus, Helmut Rathgen, Kogelnik, Limpert, Liu, Marciante, Moharam, Nguyen, Nishii, Néauport, Rhee, Tamura   +17 more
core   +5 more sources