Results 61 to 70 of about 859 (177)

Effect of Carrier Concentration on Nonlinear Electro‐Refraction and Two‐Photon Absorption of Silicon

Advanced Photonics Research, Volume 7, Issue 5, May 2026.
This research examines the impact of doping and injected excess carriers on the nonlinear optical properties of silicon. The results indicate that the bandgap narrowing phenomenon caused by doping concentration significantly affects the spectral functions associated with the nonlinear refractive index and two‐photon absorption.
E. Namjoo, A. Safaei Bezgabadi, M. Monajati   +2 more
wiley   +1 more source

Optical and dielectric properties of NiFe2O4 nanoparticles under different synthesized temperature

Results in Physics, 2017
In this research, NiFe2O4 nanoparticles was prepared via the simple sol-gel route, using different sintering temperature. This nanoparticle was characterized via X-ray diffraction (XRD) pattern, scanning electron microscopy (SEM), and FTIR spectra.
Marziye Parishani, Marzieh Nadafan, Zahra Dehghani, Rasoul Malekfar, G.H.H. Khorrami   +4 more
doaj   +1 more source

High Field Optical Nonlinearity and the Kramers-Kronig Relations

Physical Review Letters, 2012
The nonlinear optical response to high fields is absolutely measured for the noble gas atoms He, Ne, Ar, Kr, and Xe. We find that the response is quadratic in the laser field magnitude up to the ionization threshold of each gas. Its size and quadratic dependence are well predicted by a Kramers-Kronig analysis employing known ionization probabilities ...
J K, Wahlstrand, Y-H, Cheng, H M, Milchberg   +2 more
openaire   +3 more sources

Exciton spectra and energy band structure of CuAlSe2 crystals

Moldavian Journal of the Physical Sciences, 2011
The main exciton parameters and the refined values of the energy intervals V1(Г7) - C1(Г6), V2(Г6) - C1(Г6) and V3(Г7) - C1(Г6) in CuAlSe2 crystals are discussed.
Sîrbu, Nicolae, Dorogan, Andrei, Maşnic, Alisa, Ursachi, Veaceslav   +3 more
doaj  

Calculation of optical functions of exciton and electron transitions by means of kramers-kronig relations in CuAlS2 crystals

Moldavian Journal of the Physical Sciences, 2013
Excitonic reflection spectra of CuAlS2 crystals were measured at a temperature of 10 K for E||c and Ec polarizations. The shapes of the lines of ground states of Г4 and Г5 excitons were calculated by means of the Kramers-Kronig relations.
Stamov, Ivan, Sîrbu, Nicolae, Korzun, B, Ursachi, Veaceslav, Dorogan, Andrei, Maşnic, Aliona   +5 more
doaj  

Optimized Wide-Angle Metamaterial Edge Filters: Enhanced Performance with Multi-Layer Designs and Anti-Reflection Coatings

Photonics
This study presents a systematic optimization of wide-angle metamaterial long-pass (LP) edge filters based on silicon nanospheres (SiNP). Multi-layered configurations incorporating SiNP-meta-films and anti-reflection coating (ARC) elements not previously
Baidong Wu, James N. Monks, Liyang Yue, Andrew Hurst, Zengbo Wang   +4 more
doaj   +1 more source

Concentration dependences of electronic band structure of La-doped GaAs

Journal of Physics Communications
This work presents the results of a study on the electronic energy structure of La-doped gallium arsenide (GaAs). The electronic energy spectrum was calculated within the framework of density functional theory.
H A Ilchuk, I V Semkiv, S I Krukovskyi, B Andriyevsky, A I Kashuba   +4 more
doaj   +1 more source

Coupling-enhanced dual ITO layer electro-absorption modulator in silicon photonics

Nanophotonics, 2019
Electro-optic signal modulation provides a key functionality in modern technology and information networks. Photonic integration has not only enabled miniaturizing photonic components, but also provided performance improvements due to co-design ...
Tahersima Mohammad H., Ma Zhizhen, Gui Yaliang, Sun Shuai, Wang Hao, Amin Rubab, Dalir Hamed, Chen Ray, Miscuglio Mario, Sorger Volker J.   +9 more
doaj   +1 more source

Lattice dynamics and phonon characteristics of complex perovskite microwave ceramics

IET Nanodielectrics, 2019
Complex perovskite microwave dielectric ceramics (MWDCs) of [inline-formula]-type (A = Ba, Sr,…; B′ = Mg, Zn,…; B″ = Nb, Ta), which exhibit excellent dielectric properties, have currently been widely used in microwave and millimetre wave devices ...
Feng Shi, He-Lei Dong, He-Lei Dong, Di Zhou, Chun-Hai Wang, Qiu-Lin Tan, Ji-Jun Xiong, Qing Wang   +7 more
doaj   +1 more source

Beyond the weak-scattering limit: accurate Kramers–Kronig phase imaging of high-contrast reflective surfaces via pupil modulation

JPhys Photonics
Here, we present a pupil-modulation method that selectively attenuates the scattered field from an object, enabling quantitatively accurate phase retrieval based on spatial-domain Kramers–Kronig (KK) relations.
Hyeonseo Na, Seungmin Lee, Chao Tan, Doeon Lee, Mooseok Jang   +4 more
doaj   +1 more source