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Khalilzadeh, J., Arab Khorasani, A., Zaki Dizaji, H., Shahamat, Y. (2021). Design of a Hybrid Enhanced Photocathode Based on Plasmonic Nano-Grating. Electronic and Cyber Defense, 9(2), 27-33.
Javad Khalilzadeh; Ali Arab Khorasani; Hosein Zaki Dizaji; Yadollah Shahamat. "Design of a Hybrid Enhanced Photocathode Based on Plasmonic Nano-Grating". Electronic and Cyber Defense, 9, 2, 2021, 27-33.
Khalilzadeh, J., Arab Khorasani, A., Zaki Dizaji, H., Shahamat, Y. (2021). 'Design of a Hybrid Enhanced Photocathode Based on Plasmonic Nano-Grating', Electronic and Cyber Defense, 9(2), pp. 27-33.
Khalilzadeh, J., Arab Khorasani, A., Zaki Dizaji, H., Shahamat, Y. Design of a Hybrid Enhanced Photocathode Based on Plasmonic Nano-Grating. Electronic and Cyber Defense, 2021; 9(2): 27-33.

Design of a Hybrid Enhanced Photocathode Based on Plasmonic Nano-Grating

الکترومغناطیس کاربردی
Volume 9, Issue 2 - Serial Number 23, January 2022, Pages 27-33    PDF (1.28 M)
Document Type: Original Article
Authors
Javad Khalilzadeh* 1; Ali Arab Khorasani2; Hosein Zaki Dizaji3; Yadollah Shahamat4
1Associate Professor, Center for Laser Science and Technology and Optics, Imam Hossein University, Tehran, Iran
2PhD Student, Department of Photonics, Imam Hossein University, Tehran, Iran
3Assistant Professor, New War Department, Imam Hossein University, Tehran, Iran
4Researcher, Department of Photonics, Imam Hossein University, Tehran, Iran
Receive Date: 24 October 2020,  Revise Date: 02 March 2021,  Accept Date: 03 July 2021 
Abstract
The most important and effective part of any light detector is the photocathode. In this research, in order to improve the efficiency of the photocathode optical response, the plasmonic phenomenon is used and a new photocathode is designed and simulated based on the finite difference time domain (FDTD) method. By designing a periodic nano-grating on the surface, a structure is presented that makes it possible to couple the incoming light to an electron density wave on the surface. Plasmonic resonance is created in the desired wavelength range and the field strength is greatly increased. In this way, the metal-semiconductor becomes an excellent absorber. For this purpose, photocathodes with planar and non-planar (nano- grating) structures consisting of GaAs and Au are simulated separately. Then, the plasmonic nano- grating structure consisting of Au-GaAs composite materials is simulated and compared with the plasmonic nano- grating structure of gold, so that the absorption rate of the structure is increased by 16.1%. The plasmonic nano- grating structure consisting of Au-GaAs in the visible spectrum shows better performance in increasing the photocathode efficiency due to higher absorption. The structure provided for the photocathode has the advantage of filtering the incoming light with excellent accuracy and quality. Another important feature is the creation of multiple resonant frequencies simultaneously with the formation of repetitive geometry.
Keywords
Photomultiplier; Photocathode; Nano- Grating; Plasmonic; Gallium Arsenide; Gold
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