Interaction of excitons with Cherenkov radiation in WSe2 beyond the non-recoil approximation

2021 ◽  
Author(s):  
Fatemeh chahshouri ◽  
Masoud Taleb ◽  
Florian diekmann ◽  
Kai Rossnagel ◽  
Nahid Talebi
Keyword(s):  
Refractive Index ◽  
Electron Beam ◽  
Cherenkov Radiation ◽  
High Refractive Index ◽  
High Yield ◽  
Particle Detection ◽  
Thick Sample ◽  
Accurate Design ◽  
Photon Interactions ◽  
Detection Mechanisms

Abstract Cherenkov radiation from electrons propagating in materials with a high refractive index have applications in particle-detection mechanisms and could be used for high-yield coherent electron beam-driven photon sources. However, the theory of the Cherenkov radiation has been treated up to now using the non-recoil approximation, which neglects the effect of electron deceleration in materials. Here, we report on the effect of electron-beam deceleration on the radiated spectrum and exciton-photon interactions in nm-thick 〖WSe〗_2 crystals. The calculation of the Cherenkov radiation is performed by simulating the kinetic energy of an electron propagating in a thick sample using the Monto Carlo method combined with the Lienard-Wiechert retarded potential. Using this approach, we numerically investigate the interaction between the excitons and generated photons (Cherenkov radiation) beyond the non-recoil approximation and are able to reproduce experimental cathodoluminescence spectra. Our findings pave the way for an accurate design of particle scintillators and detectors, based on the strong-coupling phenomenon.

Fabrication of high refractive index TiO2films using electron beam evaporator for all dielectric metasurfaces

2018 ◽  
Vol 5 (1) ◽  
pp. 016410 ◽  
Author(s):  
Sohail Abdul Jalil ◽  
Qazi Salman Ahmed ◽  
Mahreen Akram ◽  
Naseem Abbas ◽  
Ayesha Khalid ◽  
...  
Keyword(s):  
Refractive Index ◽  
Electron Beam ◽  
High Refractive Index

A TEST OF THE REFRACTIVE INDEX IN A STRONG ELECTROMAGNETIC FIELD

2007 ◽  
Vol 21 (03n04) ◽  
pp. 657-668
Author(s):  
KENSUKE HOMMA
Keyword(s):  
Refractive Index ◽  
Electromagnetic Field ◽  
Electron Beam ◽  
Laser Intensity ◽  
Nonlinear Effects ◽  
Relativistic Electrons ◽  
Experimental Search ◽  
Strong Electromagnetic Field ◽  
Photon Interactions

A strong electromagnetic field may modify the refractive index of the normal vacuum due to nonlinear effects caused by photon-photon interactions. In order to test the increase of the refractive index, Cherenkov radiations associated with relativistic electrons into the strong electromagnetic field can be utilized as an experimental probe. We will present a result of the experimental search for the Cherenkov emissions with a laser intensity of 1017W/cm2 with the wavelength of 800nm and the electron beam of 35.4MeV/c, where photons with kinematically expected Compton energies and a symptom of visible ray emissions were observed.

High refractive index TiO2film deposited by electron beam evaporation

2009 ◽  
Vol 25 (3) ◽  
pp. 257-260 ◽  
Author(s):  
J. K. Yao ◽  
H. L. Huang ◽  
J. Y. Ma ◽  
Y. X. Jin ◽  
Y. A. Zhao ◽  
...  
Keyword(s):  
Refractive Index ◽  
Electron Beam ◽  
High Refractive Index ◽  
Electron Beam Evaporation

scholarly journals Optical emission from a high-refractive-index waveguide excited by a traveling electron beam

2008 ◽  
Vol 104 (10) ◽  
pp. 103105 ◽  
Author(s):  
Yuji Kuwamura ◽  
Minoru Yamada ◽  
Ryuichi Okamoto ◽  
Takeshi Kanai ◽  
Hesham Fares
Keyword(s):  
Refractive Index ◽  
Electron Beam ◽  
Optical Emission ◽  
High Refractive Index

Enhancement of Afterglow Luminescence of Long-Lasting Phosphor-Glass Composite by Using Refractive Index Matched Glass

2016 ◽  
Vol 702 ◽  
pp. 113-117 ◽  
Author(s):  
Masaru Yamashita ◽  
Toshinori Imamura ◽  
Sachiko Matsumoto ◽  
Masaki Murakami ◽  
Toshiaki Hongo ◽  
...  
Keyword(s):  
Refractive Index ◽  
Glass Composition ◽  
High Refractive Index ◽  
Dark Field ◽  
Glass Composite ◽  
Thick Sample ◽  
Index Matching ◽  
Digital Microscope ◽  
Refractive Index Matching ◽  
Lower Refractive Index

Composites of a long-lasting phosphor, SrAl2O4:Eu,Dy, and glass were prepared by sintering the phosphor and glass powder. To enhance the afterglow luminescence, a borosilicate glass composition was chosen so that the refractive index of the glass matched that of the phosphor. Additional components with a high refractive index, such as La2O3 and Nb2O5, were added to the glass to increase the overall refractive index. As they tend to induce crystallization during sintering, small amounts of at least three types of such components were added to the glass to prevent crystallization. The surface of the composite was observed by a digital microscope with dark-field lighting. The phosphor particles became almost transparent because of the refractive-index matching, although bubbles were observed inside the phosphor particles. The afterglow luminance was, however, almost the same and the transmittance of the composite was not high because of many voids when compared to as that of the sample using the glass with a lower refractive index. The sample prepared under vacuum showed coloration and similar afterglow luminance even though the number of voids inside the composite decreased. To suppress the coloration, the amount of tin in the glass was increased, after which higher transparency and afterglow luminance were obtained. A 4-mm-thick sample showed a luminance of 118 mcd∙m-2 60 min after irradiation by a D65 lamp with 200 lx for 20 min.

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