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Absorption enhancement of MSM photodetector structure with a plasmonic double grating structure

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6 Author(s)
Chee Leong Tan ; Sch. of Photon Sci. & Technol., Gwangju Inst. of Sci. & Technol. (GIST), Gwangju, South Korea ; Lysak, V.V. ; Das, N. ; Karar, A.
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We present finite difference time domain simulation to analyze the optical absorption enhancement of metal-semiconductor-metal photo detectors employing double plasmonic grating structures. Simulation results show that the combination of a subwavelength aperture and double nano-structured metal grating results in up to 25 times enhancement in optical absorption, in comparison to MSM photodetector structures employing only a subwavelength aperture. This improvement of the absorption enhancement is due to the coupling out function of the bottom grating structure which distributes the light to both side of the subwavelength aperture.

Published in:

Nanotechnology (IEEE-NANO), 2010 10th IEEE Conference on

Date of Conference:

17-20 Aug. 2010