Gold-patched graphene nano-stripes for high-responsivity and ultrafast photodetection from the visible to infrared regime

Semih Cakmakyapan; Ping Keng Lu; Aryan Navabi; Mona Jarrahi

doi:10.1038/s41377-018-0020-2

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Gold-patched graphene nano-stripes for high-responsivity and ultrafast photodetection from the visible to infrared regime

Original Articles

- Gold-patched graphene nano-stripes for high-responsivity and ultrafast photodetection from the visible to infrared regime
- Gold-patched graphene nano-stripes for high-responsivity and ultrafast photodetection from the visible to infrared regime
- LSA 2018年7卷第4期页码：173-181
- Affiliations：
  
  Electrical Engineering Department, University of California Los Angeles, Los Angeles, CA 90095, USA
- Author bio：
  
  Mona Jarrahi (mjarrahi@ucla.edu)
- Funds：
- DOI：10.1038/s41377-018-0020-2
  中图分类号：
- 纸质出版日期：2018，
  
  网络出版日期：2018-06-20，
  
  收稿日期：2018-01-05，
  
  修回日期：2018-03-28，
  
  录用日期：2018-04-11
- Accepted：
Scan QR Code
Gold-patched graphene nano-stripes for high-responsivity and ultrafast photodetection from the visible to infrared regime[J]. LSA, 2018,7(4):173-181.

Cakmakyapan, S. et al. Gold-patched graphene nano-stripes for high-responsivity and ultrafast photodetection from the visible to infrared regime. Light: Science & Applications, 4, 173-181 (2018).
Gold-patched graphene nano-stripes for high-responsivity and ultrafast photodetection from the visible to infrared regime[J]. LSA, 2018,7(4):173-181. DOI： 10.1038/s41377-018-0020-2.

Cakmakyapan, S. et al. Gold-patched graphene nano-stripes for high-responsivity and ultrafast photodetection from the visible to infrared regime. Light: Science & Applications, 4, 173-181 (2018). DOI： 10.1038/s41377-018-0020-2.

摘要

Abstract

Graphene is a very attractive material for broadband photodetection in hyperspectral imaging and sensing systems. However

its potential use has been hindered by tradeoffs between the responsivity

bandwidth

and operation speed of existing graphene photodetectors. Here

we present engineered photoconductive nanostructures based on gold-patched graphene nano-stripes

which enable simultaneous broadband and ultrafast photodetection with high responsivity. These nanostructures merge the advantages of broadband optical absorption

ultrafast photocarrier transport

and carrier multiplication within graphene nano-stripes with the ultrafast transport of photocarriers to gold patches before recombination. Through this approach

high-responsivity operation is realized without the use of bandwidth-limiting and speed-limiting quantum dots

defect states

or tunneling barriers. We demonstrate high-responsivity photodetection from the visible to infrared regime (0.6 A/W at 0.8 μm and 11.5 A/W at 20 μm)

with operation speeds exceeding 50 GHz. Our results demonstrate improvement of the response times by more than seven orders of magnitude and an increase in bandwidths of one order of magnitude compared to those of higher-responsivity graphene photodetectors based on quantum dots and tunneling barriers.

关键词

Keywords

references

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