Results 171 to 180 of about 620,119 (380)
Stability result for a time dependent potential in a waveguide
, 2012 We consider the operator $H:= \partial_t -\Delta+V$ in 2D or 3D waveguide. With an adapted global Carleman estimate with singular weight functions we give a stability result for the time dependent part of the potential for this particular geometry.
Gaitan, Patricia, Kian, Yavar
core +1 more source
On a Quantum Waveguide with a Small PT-symmetric Perturbation
Acta Polytechnica, 2007 We consider a quantum waveguide with a small PT-symmetric perturbation described by a potential. We study the spectrum of such a system and show that the perturbation can produce eigenvalues near the threshold of the continuous spectrum.
D. Borisov
doaj
Advanced Optical Materials, Volume 13, Issue 8, March 13, 2025.This article presents a hybrid metal‐dielectric metasurface in transmission mode for mid‐infrared (MIR) spectroscopy. Composed of germanium on aluminium cylinders atop a calcium fluoride substrate, the metasurface achieves 80% transmission efficiency at λ = 2.6 µm with a narrow full‐width‐half‐maximum of 0.4 µm.
Amr Soliman +5 more
wiley +1 more source
Influence of Outcoupling Layers on Top‐Emitting Perovskite Light‐Emitting Diodes
Advanced Optical Materials, Volume 13, Issue 8, March 13, 2025.Top‐emitting perovskite LEDs offer benefits over typical bottom‐emitting architectures, toward lasing, improved thermal management, and on‐chip fabrication compatibility. Outcoupling layers offer a strategy uniquely applicable to top‐emitting LEDs to optimize EQE by improving optical outcoupling.
James C. Loy +5 more
wiley +1 more source
A Stepped-Dielectric Transformer for Rectangular-to-Circular Waveguide (Correspondence)
, 1961 B. Maher
openalex +2 more sources
Scattering of Electromagnetic Waves by a Ferrite in a Waveguide [PDF]
, 1964 K. Kalikstein, Larry Spruch
openalex +1 more source
Fiber Bragg Gratings with Micro‐Engineered Temperature Coefficients
Advanced Optical Materials, Volume 13, Issue 8, March 13, 2025.Fiber Bragg gratings (FBGs) are intrinsically responsive to temperature and strain simultaneously. In this research, low‐loss FBGs with micro‐engineered temperature coefficients are fabricated, utilizing refractive index liquid‐filled microchannels in the cladding.
Zipei Song +8 more
wiley +1 more source
Characteristics of the earth-ionosphere waveguide for VLF radio waves
, 1964 James R. Wait
openalex +1 more source
Propagation of acoustic and infrared waves in natural waveguides over long distances [PDF]
, 1960 L. Brekhovskikh
openalex +1 more source
Advanced Optical Materials, Volume 13, Issue 8, March 13, 2025.Chalcogenide optical PCMs have gathered interest for their potential in compact, non‐volatile optics and photonics. Free‐space PCM metasurfaces require new considerations from phase change memory that need to be addressed for reliable scale‐up. Several failure mechanisms pertaining to free‐space PCM devices and layout methods are isolated to prevent ...
Cosmin Constantin Popescu +19 more
wiley +1 more source