Results 71 to 80 of about 45,769 (300)

High Sensitivity Cryogenic Temperature Sensors Based on Arc-Induced Long-Period Fiber Gratings

Sensors, 2022
In this paper, we investigated the evolution of the dispersion curves of long-period fiber gratings (LPFGs) from room temperature down to 0 K. We considered gratings arc-induced in the SMF28 fiber and in two B/Ge co-doped fibers.
Oleg V. Ivanov, Paulo Caldas, Gaspar Rego   +2 more
doaj   +1 more source

640 Gb/s timing tolerant demultiplexing using a cascaded long-period fiber grating pulse shaper [PDF]

, 2009
An SMF inscribed with two polarization independent long-period gratings is used for sub-picosecond pulse shaping and validated in a 640 Gb/s data demultiplexing experiment, providing a jitter tolerance of 510 fs.
Clausen, Anders, Galili, Michael, Hu, Hao, Jeppesen, Palle, Mulvad, Hans Christian Hansen, Oxenløwe, Leif Katsuo, Palushani, Evarist, Slavik, R.   +7 more
core  

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

Long Period Bragg Grating in Coaxial Transmission Lines

Journal of Microwaves, Optoelectronics and Electromagnetic Applications
This work shows the utilization of a coaxial cable for the fabrication of a long period Bragg grating. The grating is fabricated removing the dielectric in short pieces of the cable so that the discontinuities account for the variation in the medium ...
Sergio Luiz Stevan Jr, José Jair Alves Mendes Júnior, Frederich Conrad Janzen, Murilo Leme Oliveira, Alexandre de Almeida Prado Pohl   +4 more
doaj   +1 more source

Cladding mode coupling in highly localized fiber Bragg gratings: modal properties and transmission spectra

, 2010
The spectral characteristics of a fiber Bragg grating (FBG) with a transversely inhomogeneous refractive index profile, differs con- siderably from that of a transversely uniform one.
Andreas Tünnermann, Chan, Erdogan, Erdogan, Graham D. Marshall, Guo, Guo, Hewlett, Hewlett, Homoelle, Jens Thomas, Jovanovic, Jáuregui, Kogelnik, M. J. Steel, Marshall, Martinez, Martinez, Michael J. Withford, Mizrahi, Mizunami, Nemanja Jovanovic, Ramachandran, Ria G. Becker, Smelser, Snyder, Steel, Stefan Nolte, Thomas, Tsao, Zhou   +30 more
core   +1 more source

Development of high-speed directly-modulated DFB and DBR lasers with surface gratings [PDF]

, 2011
The conventional distributed feedback and distributed Bragg reflector edge-emitting lasers employ buried gratings, which require two or more epitaxial growth steps.
Afzal, S., Bardella, Paolo, Dumitrescu, M., Eisenstein, G., Gready, D., Kamp, M., Karinen, J., Laakso, A., Melanen, P., Montrosset, Ivo, Parillaud, O., Reithmaier J.-P., Sek, G., Telkkälä, J., Uusimaa, P., Vallone, Marco Ernesto, Viheriälä, J.   +16 more
core   +1 more source

Programmable In‐Situ Interactions Between Resins and Photopolymerized Structures for Seamlessly Integrated Optical Manufacturing of Microlenses

Advanced Functional Materials, EarlyView.
This study presents a dynamic interaction between liquid resins and photopolymerized structures enabled by an in situ light‐writing setup. By controlling a three‐phase interface through localized photopolymerization, which provides physical confinement for the remaining uncured resin regions, the approach establishes a programmable pathway that ...
Kibeom Kim, Sangmin Oh, Kahyun Hur, Hyesung Cho   +3 more
wiley   +1 more source

Plane waves in periodic, quadratically nonlinear slab waveguides: stability and exact Fourier structure

, 2001
We consider the propagation of broad optical beams through slab waveguides with a purely quadratic nonlinearity and containing linear and nonlinear long-period quasi-phase-matching gratings.
Alexander, Armstrong, Bang, Bang, Bang, Bang, Bergé, Clausen, Corney, Corney, Couderc, Cretegny, Di Trapani, Di Trapani, Fang, Fejer, Fuerst, Hayata, He, He, Helmy, Jaskorzynska, Joel F. Corney, Kobyakov, Liu, Malomed, Menyuk, Ole Bang, Pelinovsky, Petrov, Schiek, Schiek, Stegeman, Suhara, Tang, Torner, Torruellas, Torruellas, Trillo   +38 more
core   +1 more source

Grating formation in BGG31 glass by UV exposure [PDF]

, 1999
A three-dimensional index variation grating in bulk BGG31 glass written using neither hydrogen loading nor germanium doping is demonstrated. This material is useful for fabricating ion-exchanged waveguides, and its photosensitivity to ultraviolet (UV ...
Geraghty, D. F., Honkanen, S., Marshall, W. K., Peyghambarian, N., Provenzano, D., Yariv, A.   +5 more
core   +1 more source

Smart Catheters for Diagnosis, Monitoring, and Therapy

Advanced Healthcare Materials, EarlyView.
This study presents a comprehensive review of smart catheters, an emerging class of medical devices that integrate embedded sensors, robotics, and communication systems, offering increased functionality and complexity to enable real‐time health monitoring, diagnostics, and treatment. Abstract This review explores smart catheters as an emerging class of
Azra Yaprak Tarman, Samiha Ahmed, Majed Othman Althumayri, Megan Guy, Darlenne Chavez Lugo, Frances S. Ligler, George T. Ligler, Rahmi Oklu, Hiroshi Kawahira, Michael J. McShane, Jun Kameoka, Jonathan Bova, Hatice Ceylan Koydemir   +12 more
wiley   +1 more source