Absorption Enhancement in Graphene-based Photodetector with Plasmonic Structure

Khosravian, Elham and Mashayekhi, Hamid Reza (2019) Absorption Enhancement in Graphene-based Photodetector with Plasmonic Structure. In: 1st International Conference on Optoelectronics, Applied Optics and Microelectronics - 2019.

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Abstract

Graphene has demonstrated as a good candidate for optoelectronic devices such as ultrafast photodetectors. In this paper, a graphene based-photodetector with plasmonic structure consisting of Si and Sio2 substrate and graphene layer over a metal nanograting is proposed. The optical absorption of graphene layer in this structure increases through excitation of surface plasmon polaritons in Metal and graphene interface. The optical response of the proposed structure is numerically simulated using the finite-difference time-domain (FDTD) method. Based on numerical results, deep metal nanograting due to the occurrence of plasmonic effects can improve the graphene absorption from 2.3% to 70%, even to a maximum value of 80% in three-layer graphene at telecommunication wavelength (1.55 µm). Parameters like nanograting height and duty cycle (DC) are optimized for absorption enhancement in this spectral region. Also, the effects of the number of graphene layers on the absorption spectrum have been investigated.

Item Type: Conference or Workshop Item (Paper)
Persian Title: Absorption Enhancement in Graphene-based Photodetector with Plasmonic Structure
Persian Abstract: -
Subjects: Divisions > Conferences > 1st International Conference on Optoelectronics, Applied Optics and Microelectronics - 2019
Conferences > 1st International Conference on Optoelectronics, Applied Optics and Microelectronics - 2019
Divisions: Conferences > 1st International Conference on Optoelectronics, Applied Optics and Microelectronics - 2019
Subjects > Conferences > 1st International Conference on Optoelectronics, Applied Optics and Microelectronics - 2019
Date Deposited: 11 Dec 2019 10:11
Last Modified: 11 Dec 2019 10:11
URI: http://repository.uma.ac.ir/id/eprint/10697

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