The generation and radiation of the second harmonic in the normal incidence of an electromagnetic wave on an inhomogeneous layer of magnetically active plasma

1971 ◽  
Vol 14 (9) ◽  
pp. 1037-1040 ◽  
Author(s):  
V. V. Demchenko ◽  
V. V. Dolgopolov ◽  
A. Ya. Omel'chenko
Keyword(s):  
Electromagnetic Wave ◽  
Second Harmonic ◽  
Normal Incidence ◽  
Active Plasma ◽  
Inhomogeneous Layer

scholarly journals Second Harmonic Generation from Phase-Engineered Metasurfaces of Nanoprisms

Micromachines ◽  
2020 ◽  
Vol 11 (9) ◽  
pp. 848 ◽  
Author(s):  
Kanta Mochizuki ◽  
Mako Sugiura ◽  
Hirofumi Yogo ◽  
Stefan Lundgaard ◽  
Jingwen Hu ◽  
...  
Keyword(s):  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Second Harmonic ◽  
Field Enhancement ◽  
Normal Incidence ◽  
Electrical Field ◽  
Fundamental Wavelength ◽  
Reflectivity Spectra ◽  
Lift Off ◽  
Second Order Nonlinearity

Metasurfaces of gold (Au) nanoparticles on a SiO2-Si substrate were fabricated for the enhancement of second harmonic generation (SHG) using electron beam lithography and lift-off. Triangular Au nanoprisms which are non-centro-symmetric and support second-order nonlinearity were examined for SHG. The thickness of the SiO2 spacer is shown to be an effective parameter to tune for maximising SHG. Electrical field enhancement at the fundamental wavelength was shown to define the SHG intensity. Numerical modeling of light enhancement was verified by experimental measurements of SHG and reflectivity spectra at the normal incidence. At the plasmonic resonance, SHG is enhanced up to ∼3.5 × 103 times for the optimised conditions.

Dependent Scattering Properties of Woven Fibrous Insulations for Normal Incidence

1995 ◽  
Vol 117 (1) ◽  
pp. 160-166 ◽  
Author(s):  
Sunil Kumar ◽  
S. M. White
Keyword(s):  
Electromagnetic Wave ◽  
Plane Electromagnetic Wave ◽  
Normal Incidence ◽  
Woven Fabrics ◽  
Fibrous Materials ◽  
Parallel Fibers ◽  
Closed Form Solutions ◽  
Incident Plane ◽  
Additional Interaction ◽  
The Difference

The scattering properties of woven fibrous materials are examined in this paper and a simple model is presented to account for the interactions between the scattered radiation from different individual fibers. The case of a normally incident plane electromagnetic wave is considered. Fiber sizes in the Rayleigh regime are considered for developing closed-form solutions. Previous studies in the literature that have addressed the scattering properties of fibrous materials have mostly ignored the effect of constructive or destructive addition of scattered waves from individual fibers, the exception being the case of parallel fibers. The difference in the effects of interference on scattering properties of parallel fibers and of woven fabrics arises from the additional interaction of radiation scattered from mutually perpendicular fibers in the latter case, which further complicates the analysis.

scholarly journals Monolayer Graphene Can Emit SHG Waves

2017 ◽  
Vol 3 (1) ◽  
Author(s):  
David N. Carvalho ◽  
Fabio Biancalana ◽  
Andrea Marini
Keyword(s):  
Dirac Equation ◽  
Harmonic Generation ◽  
Second Harmonic ◽  
Normal Incidence ◽  
Monolayer Graphene ◽  
Harmonic Waves ◽  
Two Dimensional ◽  
Wide Range ◽  
Two Dimensional Materials ◽  
Breaking Mechanism

AbstractThe usually-held notion that monolayer graphene, a centrosymmetric system, does not allow even-harmonic generation when illuminated at normal incidence is challenged by the discovery of a peculiar effect we term the dynamical centrosymmetry breaking mechanism. This effect results in a global pulse-induced oscillation of the Dirac cones which in turn produces second harmonic waves. We prove that this result can only be found by using the full Dirac equation and show that the widely used semiconductor Bloch equations fail to reproduce this and some other important physics of graphene. These results clear the way for further investigation concerning nonlinear light-matter interactions in a wide range of two-dimensional materials admitting either a gapped or ungapped Dirac-like spectrum.

scholarly journals Model of Е-polarized wave propagation in a multilayer dielectric structure

2021 ◽  
Vol 2021 (3) ◽  
pp. 111-118
Author(s):  
P.I. Zabolotnyi ◽  
Keyword(s):  
Dielectric Constant ◽  
Electromagnetic Wave ◽  
Reflection Coefficient ◽  
Incidence Angle ◽  
Relative Dielectric Constant ◽  
Normal Incidence ◽  
Dielectric Constants ◽  
Dielectric Structure ◽  
Range Of Variation ◽  
Multilayer Dielectric

This paper addresses the determination of the dielectric constant of multilayer dielectric structures by radiowave interferometry. In the general case, in interferometry measurements to one measured value of the reflection coefficient there may correspond an infinity of dielectric constants. This ambiguity may be resolved by first determining the effect of different parameters of the probing electromagnetic wave on the reflection coefficient. In particular, it is important to have a preliminary estimate of the effect of the incidence angle and the polarization on the range of variation of the reflection coefficient with the variation of one of the structure parameters. This paper considers the case where a plane E-polarized electromagnetic wave, i.e. a wave whose magnetic field is perpendicular to the incidence plane, is incident on a multilayer dielectric structure. The aim of this work is to develop a model of the propagation of an E-polarized electromagnetic wave through a multilayer dielectric structure at an arbitrary incidence angle and to determine the range of variation of the reflection coefficient with the variation of the dielectric constants of the layers. The paper presents a model of the propagation of an E-polarized electromagnetic wave in a two-layer dielectric structure. A metal base, which is an ideal conductor, underlies the structure. The electromagnetic wave is incident from the air at an arbitrary incidence angle. Based on the model, a method is proposed for measuring the relative dielectric constant and the dielectric loss tangent. It is shown that at a normal incidence the reflection coefficient magnitude is the same both for H- and E-polarization. Because of this, determining the relative dielectric constant and the loss tangent from the measured reflection coefficient magnitude calls for measurements not only at a normal incidence, but also at an oblique incidence, at which the reflection coefficient magnitudes will be different for H- and E-polarization.

Sign in / Sign up

Export Citation Format

Share Document