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

被引：1
|
作者：
Yu, Zongfu [1 ]
Veronis, Georgios [1 ]
Brongersma, Mark L. [2 ]
Fan, Shanhui [1 ]
机构：
[1] Stanford Univ, Ginzton Lab, Stanford, CA 94305 USA
[2] Stanford Univ, Geballe Lab Adv Mat, Stanford, CA 94305 USA
来源：
INTEGRATED OPTICS: DEVICES, MATERIALS, AND TECHNOLOGIES XI | 2007年 / 6475卷
关键词：
surface plasmons; infrared photodetectors; grating; signal/noise ratio;
D O I：
10.1117/12.698016
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
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(0) = 9.8 mu m 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.
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页数：6
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