scholarly journals Моды волновода с пороговой нелинейностью

2020 ◽  
Vol 46 (16) ◽  
pp. 43
Author(s):  
С.Е. Савотченко
Keyword(s):  
Dielectric Constant ◽  
Optical Properties ◽  
Surface Waves ◽  
Nonlinear Optical ◽  
Layer Structure ◽  
Finite Thickness ◽  
Critical Value ◽  
Field Structure ◽  
Finite Width ◽  
Border Regions

A three-layer structure consisting of a nonlinear optical medium with a stepwise change in the dielectric constant inside which there is a dielectric layer of finite thickness is considered. The surface waves of two types of symmetry with a special field structure can propagate along the layers. Domains of finite width with different optical properties in the border regions in a nonlinear medium are formed. The formation of domains, as well as the existence of surface waves, occurs at interlayer thicknesses not exceeding a certain critical value.

scholarly journals Поверхностные волны на границе среды с переключением показателя преломления и кристалла с фоторефрактивной нелинейностью диффузионого типа

2020 ◽  
Vol 62 (8) ◽  
pp. 1260
Author(s):  
С.Е. Савотченко
Keyword(s):  
Refractive Index ◽  
Surface Waves ◽  
Propagation Constant ◽  
Analytical Form ◽  
Field Structure ◽  
Photorefractive Crystal ◽  
Border Region ◽  
Finite Width ◽  
The Media ◽  
And Control

A model is formulated, in which the patterns of the formation of nonlinear surface waves with a specific field structure are described. It is shown that there are two new types of waves of selected polarization that propagate along the contact of a photorefractive crystal with diffusion nonlinearity and a nonlinear optical medium with switching. Nonlinearity in such a medium is modeled by a stepwise change in the refractive index depending on the field amplitude. The field structure in the obtained surface waves consists of three components in different areas of the contacting media. As a result of the propagation of a localized light beam along the boundary in the border region, a zone of finite width is formed, characterized by a refractive index that differs from the rest of the medium. In the region behind such a domain, the field decreases exponentially with distance from the border region. The field can decrease with or without oscillations In a photorefractive crystal. The dependence of the propagation constant on the optical characteristics of the media and control parameters is obtained in an explicit analytical form.  

Effect of Charge and Dielectric Constant on Linear and Nonlinear Optical Properties of Two Dyes

2019 ◽  
Vol 48 (7) ◽  
pp. 4310-4323 ◽  
Author(s):  
Soheil Sharifi ◽  
Mehdi Khazaei Nezhad ◽  
Seyed Ahmad Sangsefedi ◽  
Forough Rakhshanizadeh
Keyword(s):  
Dielectric Constant ◽  
Optical Properties ◽  
Nonlinear Optical ◽  
Nonlinear Optical Properties ◽  
Linear And Nonlinear

MAGNETIC FIELD, PRESSURE AND TEMPERATURE DEPENDENT OPTICAL PROPERTIES IN A GaAs 9.0 P 1.0 QUANTUM DOT

2014 ◽  
Vol 6 (2) ◽  
pp. 1178-1190
Author(s):  
A. JOHN PETER ◽  
Ada Vinolin
Keyword(s):  
Magnetic Field ◽  
Optical Properties ◽  
Quantum Dot ◽  
Field Strength ◽  
Magnetic Field Strength ◽  
Photon Energy ◽  
Nonlinear Optical ◽  
Binding Energies ◽  
Nonlinear Optical Properties ◽  
Optical Rectification

Simultaneous effects of magnetic field, pressure and temperature on the exciton binding energies are found in a 9.0 1.0 6.0 4.0 GaAs P / GaAs P quantum dot. Numerical calculations are carried out taking into consideration of spatial confinement effect. The cylindrical system is taken in the present problem with the strain effects. The electronic properties and the optical properties are found with the combined effects of magnetic field strength, hydrostatic pressure and temperature values. The exciton binding energies and the nonlinear optical properties are carried out taking into consideration of geometrical confinement and the external perturbations.Compact density approach is employed to obtain the nonlinear optical properties. The optical rectification coefficient is obtained with the photon energy in the presence of pressure, temperature and external magnetic field strength. Pressure and temperature dependence on nonlinear optical susceptibilities of generation of second and third order harmonics as a function of incident photon energy are brought out in the influence of magnetic field strength. The result shows that the electronic and nonlinear optical properties are significantly modified by the applications of external perturbations in a 9.0 1.0 6.0 4.0 GaAs P / GaAs P quantum dot.

Linear and Nonlinear Optical Properties of Small Silicon Clusters

1990 ◽  
Author(s):  
Tapio T. Rantala ◽  
Mark I. Stockman ◽  
Daniel A. Jelski ◽  
Thomas F. George
Keyword(s):  
Optical Properties ◽  
Nonlinear Optical ◽  
Nonlinear Optical Properties ◽  
Silicon Clusters ◽  
Linear And Nonlinear
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