Absorption enhancement of In0.53Ga0.47As photodetector with rear plasmonic nanostructure

Binzong Xu; Jietao Liu; Weimin Wang; Yun Xu; Qing Wang; Guofeng Song; Xin Wei

doi:10.1117/12.2035101

23 August 2013 Absorption enhancement of In_0.53Ga_0.47As photodetector with rear plasmonic nanostructure

Binzong Xu, Jietao Liu, Weimin Wang, Yun Xu, Qing Wang, Guofeng Song, Xin Wei

Proceedings Volume 8911, International Symposium on Photoelectronic Detection and Imaging 2013: Micro/Nano Optical Imaging Technologies and Applications; 891110 (2013) https://doi.org/10.1117/12.2035101
Event: ISPDI 2013 - Fifth International Symposium on Photoelectronic Detection and Imaging, 2013, Beijing, China

Abstract

In this paper, metallic back structure with one dimensional periodic nano-ridge is attached to the capping layer of the In_0.53Ga_0.47As photodetector with 100 nm absorption layer. We present finite difference time domain (FDTD) simulation to analyze the optical absorption enhancement of the photodetector. By comparing with the photodetector with planar metallic film, simulation results show that by introducing the nanostructure a 2.8 times and a 3 times absorption enhancements can be achieved under transverse magnetic (TM) and transverse electric (TE) polarized plane wave illuminations, respectively. Increasing the period of the nanostructure, the absorption enhancement peak positions exhibit a red shift. In addition, the optimization of the metal grating height and width is also crucial for maximizing the absorption enhancement. The absorption enhancements are well explained by surface plasmon polaritons and Rayleigh Anomalies phenomena. Solid simulation and theoretical results are both presented with good agreement with each other.

Citation Download Citation

Binzong Xu, Jietao Liu, Weimin Wang, Yun Xu, Qing Wang, Guofeng Song, and Xin Wei "Absorption enhancement of In_0.53Ga_0.47As photodetector with rear plasmonic nanostructure", Proc. SPIE 8911, International Symposium on Photoelectronic Detection and Imaging 2013: Micro/Nano Optical Imaging Technologies and Applications, 891110 (23 August 2013); https://doi.org/10.1117/12.2035101

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KEYWORDS

Absorption

Photodetectors

Indium gallium arsenide

Gold

Nanostructures

Surface plasmon polaritons

Finite-difference time-domain method

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