Design of mid-infrared photodetectors enhanced by surface plasmons on grating structures

Zongfu Yu; Georgios Veronis; Mark L. Brongersma; Shanhui Fan

doi:10.1117/12.698016

9 February 2007 Design of mid-infrared photodetectors enhanced by surface plasmons on grating structures

Zongfu Yu, Georgios Veronis, Mark L. Brongersma, Shanhui Fan

Proceedings Volume 6475, Integrated Optics: Devices, Materials, and Technologies XI; 64750Q (2007) https://doi.org/10.1117/12.698016
Event: Integrated Optoelectronic Devices 2007, 2007, San Jose, California, United States

Abstract

We propose to exploit the unique properties of surface plasmons to enhance the signal-to-noise ratio of mid-infrared photodetectors. The proposed photodetector consists of a slit in a metallic slab filled with absorptive semiconductor material. Light absorption in the slit is enhanced due to Fabry-Perot resonances. Further absorption enhancement is achieved by surrounding the slit with a series of periodic grooves that enable the excitation of surface plasmons that carry electromagnetic energy towards the slit. Using this scheme, we design and optimize a photodetector operating at lambda_o = 9.8 microns with a roughly 250 times enhancement in the absorption per unit of volume of semiconductor material compared to conventional photodetectors operating at the same wavelength.

Citation Download Citation

Zongfu Yu, Georgios Veronis, Mark L. Brongersma, and Shanhui Fan "Design of mid-infrared photodetectors enhanced by surface plasmons on grating structures", Proc. SPIE 6475, Integrated Optics: Devices, Materials, and Technologies XI, 64750Q (9 February 2007); https://doi.org/10.1117/12.698016

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