Results 51 to 60 of about 11,164,603 (262)

Optical fibre long period grating based selective vapour sensing of volatile organic compounds [PDF]

, 2010
The chemical sensing capabilities of an optical fibre long period grating (LPG) coated with a functional material are explored. The LPG period and coating thickness are chosen such that the mode transition region, characteristic of LPGs coated with ...
Tatam, Ralph P., Higson, Seamus P. J., Topliss, Stephen M., James, Stephen W., Davis, Frank   +4 more
core   +1 more source

Elasticity‐Driven Periodic Polarization Patterns in a Chiral Ferroelectric Nematic Fluid

Advanced Materials, EarlyView.
Chiral polar ferroelectric nematic fluids exhibit spontaneous formation of stripe, square, and hexagonal polarization textures under confinement. Controlled by thickness and anchoring, these patterns produce spatially modulated nonlinear optical responses.
Anej Sterle, Peter Medle Rupnik, Luka Cmok, Aitor Erkoreka, Marta Lavrič, Natan Osterman, Calum J. Gibb, Jordan Hobbs, Josu Martinez‐Perdiguero, Richard J. Mandle, Alenka Mertelj, Nerea Sebastián   +11 more
wiley   +1 more source

Response of fibre optic long period gratings operating near the phase matching turning point to the deposition of nanostructured coatings. [PDF]

, 2008
The response of the dual resonant bands of a fibre optic long period grating operating near the phase matching turning point to the deposition of a nanostructured coating is investigated. The dual resonant bands are observed to show a high sensitivity to
Tatam, Ralph P., Topliss, Stephen M., James, Stephen W., Cheung, C. S.   +3 more
core   +1 more source

Microscale 3D‐Printed Digital Strain Switches for Embedded Mechanical Computation

Advanced Materials Technologies, EarlyView.
Microscale 3D‐printed strain switches on flexible films convert deformation into native digital signals at geometry defined thresholds. A closed form model predicts switching from 3000 to 15 000 microstrain and is validated across 110 devices. Reliable ohmic closure and strain activated AND, OR, and XOR logic point toward low‐power mechanical ...
Regan Kubicek, Daniel Quinn, Gabriel Smith, Sarah Bergbreiter   +3 more
wiley   +1 more source

Structure-Modulated Long-Period Fiber Gratings: A Review

Photonics
Structure-Modulated Long-Period Fiber Gratings (SM-LPFGs) represent an advancement in fiber optic sensor technology, moving beyond traditional photosensitivity-based fabrication to achieve enhanced performance through the direct physical modification of ...
Tianyu Du, Hongwei Ding, Feng Wang, You Li, Yiwei Ma   +4 more
doaj   +1 more source

A Simple Spectral Interrogation System for Optical Fiber Sensors

Proceedings, 2019
Optical fiber sensors (OFS) based on long-period fiber gratings (LPFG) or on surface plasmon resonance (SPR) represent attractive solutions for detection systems in remote areas.
Paulo S. S. dos Santos, Pedro A. S. Jorge, José M. M. M. de Almeida, Luis Coelho   +3 more
doaj   +1 more source

Long-Period Fiber Gratings Coated with Poly(ethylene glycol) as Relative Humidity Sensors

U.Porto Journal of Engineering, 2022
Relative humidity is an important parameter in controlled environments and is typically monitored using low-cost electrochemical sensors with low resolution and accuracy.
Bernardo Dias, José Almeida, Luís Coelho   +2 more
doaj   +1 more source

Strong long-period fiber gratings recorded at 352?nm [PDF]

Optics Letters, 2005
We describe long-period grating inscription in hydrogenated telecom fibers by use of high-intensity femtosecond 352 nm laser pulses. We show that this technique allows us to fabricate high-quality 30 dB gratings of 300 microm period and 2 cm length by use of a three-photon absorption mechanism.
Dubov, Mykhaylo, Bennion, Ian, Slattery, Stephen A., Nikogosyan, David N.   +3 more
openaire   +3 more sources

Differential phase tracking applied to Bragg gratings in multi-core fibre for high accuracy curvature measurement [PDF]

, 2006
High resolution quasi-static and dynamic curvature measurements are made by differential interferometric phase measurement of fibre Bragg gratings in separate cores of a multi-core fibre.
Flockhart, G M H, Kirkendall, Clay K., Clay K. Kirkendall, Cranch, G A, Flockhart, Gordon M. H., Geoffrey A. Cranch, Kirkendall, C K, Gordon M. H. Flockhart, Cranch, Geoffrey A.   +8 more
core   +1 more source

Large‐Area Flat Optics Color Routing in Tilted Arrays of 2D Semiconductor Nanostripes

Advanced Optical Materials, EarlyView.
We develop a scalable flat optics platform exploiting self‐organised ion‐beam sputtering and maskless glancing‐angle deposition to fabricate centimetre‐scale arrays of tilted MoS2 nanostripes. The engineered geometry activates Rayleigh anomalies, guided modes, and Mie resonances, enabling highly directional color routing and enhanced light harvesting ...
Simone Di Marco, Daniele Ceneda, Matteo Barelli, Matteo Gardella, Rajesh Chennuboina, Maria C. Giordano, Marco Centini, Francesco Buatier de Mongeot   +7 more
wiley   +1 more source