Electromagnetic energy flow in confined regions of evanescent waves: wavelength-scale analysis by the method of single expression

2019 ◽  
Vol 51 (9) ◽  
Author(s):  
H. V. Baghdasaryan ◽  
T. M. Knyazyan ◽  
T. T. Hovhannisyan ◽  
T. Baghdasaryan ◽  
A. V. Daryan ◽  
...  
Keyword(s):  
Energy Flow ◽  
Evanescent Waves ◽  
Electromagnetic Energy ◽  
Scale Analysis ◽  
Method Of Single Expression ◽  
Wavelength Scale

scholarly journals Influence of Chirped DBR Reflector on the Absorption Efficiency of Multi-nanolayer Photovoltaic Structures: Wavelength-scale Analysis by the Method of Single Expression

2017 ◽  
pp. 99-106
Author(s):  
Hovik Baghdasaryan ◽  
Tamara Knyazyan ◽  
Tamara Hovhannisyan ◽  
Gurgen Mardoyan ◽  
Marian Marciniak ◽  
...  
Keyword(s):  
Practical Importance ◽  
Flow Distribution ◽  
Antireflection Coating ◽  
Absorption Efficiency ◽  
Bragg Reflector ◽  
Scale Analysis ◽  
Distributed Bragg Reflector ◽  
Sio2 Substrate ◽  
Method Of Single Expression ◽  
Wavelength Scale

An electromagnetic wavelength-scale analysis of the optical characteristics of multi-nanolayer photovoltaic (PV) structures: without an antireflection coating, with an antireflection coating on the top of the structure, and with both the antireflection coating on the top and a broadband non-periodic (chirped) distributed Bragg reflector (DBR) on the bottom of the structure is performed. All the PV structures studied are based on a Si p-i-n type absorber supported by a metallic layer (Cu) and SiO2 substrate. The top-to-bottom electromagnetic analysis is performed numerically by the method of single expression (MSE). Absorbing and reflecting characteristics of the multi-nanolayer PV structures are obtained. The influence of the thicknesses and permittivities of the layers of the PV structures on the absorbing characteristics of the structures is analyzed to reveal favourable configurations for enhancement of their absorption efficiency. The localizations of the electric component of the optical field and the power flow distribution within all the PV structures considered are obtained to confirm an enhancement of the absorption efficiency in the favorable configuration. The results of the electromagnetic wavelength-scale analysis undertaken will have scientific and practical importance for optimizing the operation of thin-filmmulti-nanolayer PV structures incorporating a chirped DBR reflector with regards to enhancing their efficiency.

Investigation of energy conversion processes and wave activity related to dipolarization fronts observed by MMS

2021 ◽  
Author(s):  
Soboh Alqeeq ◽  
Olivier Le Contel ◽  
Patrick Canu ◽  
Alessandro Retino ◽  
Thomas Chust ◽  
...  
Keyword(s):  
Energy Conversion ◽  
Energy Flow ◽  
Poynting Vector ◽  
Wave Activity ◽  
Electromagnetic Energy ◽  
Particle Measurements ◽  
Dipolarization Front ◽  
The Earth ◽  
Current Densities ◽  
Scale Properties

<p>In the present work, we consider four dipolarization front (DF) events detected by MMS spacecraft in the Earth’s magnetotail during a substorm on 23rd of July 2017 between 16:05 and 17:19 UT. From their ion scale properties, we show that these four DF events embedded in fast Earthward plasma flows have classical signatures with increases of Bz, velocity and temperature and a decrease of density across the DF. We compute and compare current densities obtained from magnetic and particle measurements and analyse the Ohm’s law. Then we describe the wave activity related to these DFs. We investigate energy conversion processes via J.E calculations and estimate the importance of the electromagnetic energy flow by computing the divergence of the Poynting vector. Finally we discuss the electromagnetic energy conservation in the context of these DFs.</p>

Absorption loss influence on optical characteristics of multilayer distributed Bragg reflector: wavelength-scale analysis by the method of single expression

2010 ◽  
Vol 18 (4) ◽  
Author(s):  
H.V. Baghdasaryan ◽  
T.M. Knyazyan ◽  
T.H. Baghdasaryan ◽  
B. Witzigmann ◽  
F. Roemer
Keyword(s):  
Power Flow ◽  
Normal Incidence ◽  
Bragg Reflector ◽  
Flow Density ◽  
Problem Solution ◽  
Absorption Loss ◽  
Distributed Bragg Reflector ◽  
Method Of Single Expression ◽  
Quarter Wave ◽  
Wavelength Scale

AbstractElectrodynamical model of a classical distributed Bragg reflector (DBR) consisting of alternating quarter-wave layers of high and low permittivity is considered at the plane wave normal incidence. Reflective characteristics of DBR possessing absorption loss in constituting layers are analysed via correct wavelength-scale boundary problem solution by the method of single expression (MSE). Analysis of optical field and power flow density distributions within the lossy DBR structures explained the peculiarities of their reflective characteristics. Optimal configurations of lossless and lossy DBRs are revealed. Specific DBR structures possessing full transparency at definite number of layers are also analysed.

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