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Numerical investigation of the effect of optical pulse position on the response of an unbiased BGMSM photodetector using ADI method

Published online by Cambridge University Press:  16 July 2012

V. Mosallanejad ,
H.R. Mashayekhi  and
E. Menbari
V. Mosallanejad
Affiliation:
Department of Photonics, Kerman Graduate University of Technology, Kerman, Iran
H.R. Mashayekhi*
Affiliation:
Physics Group, Guilan University, Rasht, Iran
E. Menbari
Affiliation:
Physics Group, Guilan University, Rasht, Iran
*
ae-mail: [email protected]
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Abstract

A numerical method for describing the electrical response of a Back-Gated Metal-Semiconductor- Metal Photodetector (BGMSM-PD) to an impinging optical pulse on the active region of the device is presented. In the absence of external voltage, the main mechanism for the transport of photo-generated carriers is diffusion mechanism. Two nonlinear differential equations describe the behavior of photocarriers’ densities in the device medium with respect to time and position. Having linearized the parabolic partial differential equations, the time evolution of carrier densities is calculated using the Alternating Direction Implicit (ADI) method. The numerical results show good agreement with the experimental data. Both experimental and numerical findings confirm that the electrical response of the device to optical pulses with spatial FWHM comparable with the width of the active region is dependent on pulse position on the active region. This feature of the device makes it to be a good candidate as position sensors in places where micro-positioning is required.

Type
Research Article
Information
The European Physical Journal - Applied Physics , Volume 59 , Issue 1 , July 2012 , 10102
Copyright
© EDP Sciences, 2012

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