Results 91 to 100 of about 2,235,211 (295)

Difference frequency generation by quasi-phase matching in periodically intermixed semiconductor superlattice waveguides [PDF]

, 2011
Wavelength conversion by difference frequency generation is demonstrated in domain-disordered quasi-phase-matched waveguides. The waveguide structure consisted of a GaAs/AlGaAs superlattice core that was periodically intermixed by ion implantation.
David C. Hutchings, Helmy, A.S., Sean J. Wagner, Iliya Sigal, Wagner, S.J., Younis, U., Sigal, I., Holmes, B.M., Amr S. Helmy, Hutchings, D.C., Barry M. Holmes, Usman Younis, Aitchison, S.J., J. Stewart Aitchison   +13 more
core   +1 more source

Dielectric Permittivity Tensor of Muscovite for Next Generation All Van Der Waals Broadband Photonic Components

Advanced Optical Materials, EarlyView.
Low‐index and low‐loss vdW muscovite represents an emerging robust dielectric platform for the creation of next‐generation all‐vdW nanophotonic architectures. Its utilization as a low‐index building‐block in all‐vdW multilayers enables extreme optical contrast when paired with MoS2, paving the way to the realization of few‐layer ultrathin DBS ...
Meri H. Hayrapetyan, Maksim L. Sargsyan, Davit A. Karakhanyan, Ani P. Khachatryan, Maria A. Levonyan, Dmitrii Litvinov, Maciej Koperski, Artsruni V. Margaryan, Makars Šiškins, Konstantin S. Novoselov, Davit A. Ghazaryan   +10 more
wiley   +1 more source

Nonlinearities in silicon optical fibers [PDF]

, 2011
The nonlinear propagation characteristics in a hydrogenated amorphous silicon core optical fiber are investigated to demonstrate ultra-fast all-optical switching by cross-absorption ...
Day, T.D., Peacock, A.C., J. V. Badding, Sazio, P.J.A., P. J. A. Sazio, N. Healy, Watts, R.T., R. T. Watts, Sparks, J.R., Slavík, R., R. Slavík, A. C. Peacock, J. R. Sparks, Mehta, P., Healy, N., Badding, J.V., P. Mehta, T. D. Day   +17 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

Optofluidic Planar Optical Cross-Connect Using Nematic Liquid-Crystal Waveguides

IEEE Photonics Journal, 2018
This paper proposes a compact planar optofluidic optical cross-connect (OXC) switch based on electro-optic (EO) waveguides in nematic liquid crystal (NLC).
Tenghao Li, Qingming Chen, Xuming Zhang
doaj   +1 more source

Mode dispersion and delay characteristics of optical waveguides using equivalent TL circuits [PDF]

, 2005
A new analysis leading to an exact and efficient algorithm is presented for calculating directly and without numerical differentiation the mode dispersion characteristics of cylindrical dielectric waveguides of arbitrary refractive-index profile. The new
Boucouvalas, Anthony C., Qian, Xin, null Xin Qian, A.C. Boucouvalas   +3 more
core   +2 more sources

Geometry‐Driven Whispering‐Gallery Modes in Self‐Assembled Phosphorescent Organic Microtubes

Advanced Optical Materials, EarlyView.
Micelles encapsulating tris(2‐phenylpyridine)iridium(III) self‐assemble into a hollow hexagonal microtube stabilized by a surface passivation layer. The hexagonal cross‐section confines circulating light along its facets, sustaining sharp whispering‐gallery resonances that guide photoluminescence emission under laser excitation.
Do Wan Kim, Seokho Kim, Jinho Choi, Sang‐hun Lee, Seongwan Bae, Jongho Kim, Sangjun Lee, Junseok Heo, Sangin Kim, Kyusang Lee, Dong Hyuk Park   +10 more
wiley   +1 more source

Ion-Implanted Diamond Blade Diced Ridge Waveguides in Pr:YLF—Optical Characterization and Small-Signal Gain Measurement

Applied Sciences
Planar optical waveguides were fabricated in Pr:YLF crystals by ion implantation. In a further step, ridge waveguides were fabricated using precision diamond dicing.
Omer Altaher, Kore Hasse, Sergiy Suntsov, Hiroki Tanaka, Christian Kränkel, Istvan Bányász, Romana Mikšová, Detlef Kip   +7 more
doaj   +1 more source

Photoluminescent Color Centers on a Mainstream Silicon Photonic Foundry Platform

Advanced Optical Materials, EarlyView.
Silicon photonic chips route and process light efficiently but are inherently inefficient at generating it. Here, bright light‐emitting defects, W‐centers, are written into the silicon layer of finished chips from a mainstream commercial foundry: high‐energy ions are implanted straight through the protective oxide and activated by a 250∘C$^\circ{\rm C}$
Prosper Dellah Allo, A. Aadhi, Amirhossein Mosaddegh Yengejeh, Hazel Bakajsza, Mirabel N. M. Mensah, Marcus Tamura, Bhavin J. Shastri, Alexander N. Tait   +7 more
wiley   +1 more source

Massively Degenerate Coherent Perfect Absorption in Gradient‐Index Fibers

Advanced Optical Materials, EarlyView.
A coherent perfect absorber (CPA) normally operates for only one or very few spatial modes. The CPA proposed here uses a gradient‐index (GRIN) fiber to absorb hundreds of spatial modes at once, its self‐imaging property replacing the bulky free‐space degenerate cavity of earlier designs. An analytic criterion sets how much modal degeneracy is required,
Helmut Hörner, Şahin K. Özdemir, Stefan Rotter   +2 more
wiley   +1 more source