scholarly journals Модифицированная теория связанных волн и численный метод для анализа брэгговских зеркал с произвольным профилем показателя преломления

2021 ◽  
Vol 91 (12) ◽  
pp. 1997
Author(s):  
Р.А. Мастеров ◽  
С.Ю. Карпов
Keyword(s):  
Refractive Index ◽  
Knowledge Base ◽  
Numerical Approach ◽  
Refractive Index Profile ◽  
Group Iii Nitrides ◽  
Index Profile ◽  
Group Iii ◽  
Hybrid Numerical Method ◽  
Analytical Expressions ◽  
Modified Theory

An analytical and effective numerical approach to the analysis of the optical characteristics of Bragg mirrors with an arbitrary refractive index profile is developed. Analytical expressions obtained using the modified theory of coupled waves for the coefficients of reflection / transmission of light from / through the BM with high accuracy predict its main characteristics at both low and high contrast of the refractive index. The hybrid numerical method includes the numerical calculation of the transfer matrix for one period of the knowledge base and its analytical multiplication for an arbitrary number of periods. The developed methods are applied to the analysis of the properties of practically important BMs made on the basis of sprayed pairs of Ta2O5 / SiO2 dielectrics, Group III nitrides and arsenides. The characteristics of the knowledge base with smooth (gradient) interfaces are considered in detail.

scholarly journals Influence of Rugate Filters on the Spectral Manifestation of Tamm Plasmon Polaritons

Materials ◽  
2021 ◽  
Vol 14 (5) ◽  
pp. 1282
Author(s):  
Victor Reshetnyak ◽  
Igor Pinkevych ◽  
Timothy Bunning ◽  
Dean Evans
Keyword(s):  
Refractive Index ◽  
Band Gap ◽  
External Medium ◽  
Metal Layer ◽  
Refractive Index Profile ◽  
Spectral Position ◽  
Index Profile ◽  
Reflection And Transmission ◽  
Rugate Filter ◽  
Plasmon Polaritons

This study theoretically investigated light reflection and transmission in a system composed of a thin metal layer (Ag) adjacent to a rugate filter (RF) having a harmonic refractive index profile. Narrow dips in reflectance and peaks in transmittance in the RF band gap were obtained due to the excitation of a Tamm plasmon polariton (TPP) at the Ag–RF interface. It is shown that the spectral position and magnitude of the TPP dips/peaks in the RF band gap depend on the harmonic profile parameters of the RF refractive index, the metal layer thickness, and the external medium refractive index. The obtained dependences for reflectance and transmittance allow selecting parameters of the system which can be optimized for various applications.

Nondestructive refractive‐index profile measurements of clad optical fibers

1975 ◽  
Vol 26 (10) ◽  
pp. 574-575 ◽  
Author(s):  
M. E. Marhic ◽  
P. S. Ho ◽  
M. Epstein
Keyword(s):  
Refractive Index ◽  
Optical Fibers ◽  
Refractive Index Profile ◽  
Index Profile

REFRACTIVE INDEX PROFILE RECONSTRUCTION OF PLANAR WAVEGUIDE FROM ITS MODE INTENSITY USING CHARACTERISTIC MATRIX METHOD

2001 ◽  
Vol 10 (02) ◽  
pp. 169-179
Author(s):  
HENRI P. URANUS ◽  
M. O. TJIA
Keyword(s):  
Refractive Index ◽  
Intensity Distribution ◽  
Planar Waveguide ◽  
Nonlinear Least Squares ◽  
Refractive Index Profile ◽  
Characteristic Matrix ◽  
Least Squares Regression ◽  
Index Profile ◽  
Measured Intensity ◽  
Parameter Values

A method is proposed for the reconstruction of refractive index profile of planar waveguide from its fundamental mode intensity profile. The reconstruction is performed by fitting the calculated intensity distribution iteratively with the measured intensity distribution employing nonlinear least-squares regression technique. At each stage of iteration, new trial parameter values are generated and used to form a waveguide model approximated by a multilayer structure with stepwise index distribution, upon which the intensity distribution is then calculated by using the characteristic matrix technique. This method was numerically examined by using samples of either known or unknown analytic expression of the index profile.

An Optical Differentiator Based on a Three-Layer Structure with a W-Shaped Refractive Index Profile

2018 ◽  
Vol 127 (2) ◽  
pp. 202-209 ◽  
Author(s):  
N. V. Golovastikov ◽  
L. L. Doskolovich ◽  
E. A. Bezus ◽  
D. A. Bykov ◽  
V. A. Soifer
Keyword(s):  
Refractive Index ◽  
Layer Structure ◽  
Refractive Index Profile ◽  
Index Profile ◽  
Optical Differentiator
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