Graphene-Antenna Sandwich Photodetector

被引：618

作者：

Fang, Zheyu ^{[1
,4
]}

Liu, Zheng ^{[3
]}

Wang, Yumin ^{[1
]}

Ajayan, Pulickel M. ^{[3
]}

Nordlander, Peter ^{[1
,2
]}

Halas, Naomi J. ^{[1
,2
]}

机构：

[1] Rice Univ, Dept Elect & Comp Engn, Lab Nanophoton, Houston, TX 77005 USA

[2] Rice Univ, Dept Phys & Astron, Houston, TX 77005 USA

[3] Rice Univ, Dept Mech Engn & Mat Sci, Houston, TX 77005 USA

[4] Peking Univ, Sch Phys, State Key Lab Mesoscop Phys, Beijing 100871, Peoples R China

来源：

NANO LETTERS | 2012年 / 12卷 / 07期

关键词：

Plasmonics; graphene; Fano resonances; hot electron; field enhancement; PLASMONICS; PHOTORESPONSE;

D O I：

10.1021/nl301774e

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Nanoscale antennas sandwiched between two graphene monolayers yield a photodetector that efficiently converts visible and near-infrared photons into electrons with an 800% enhancement of the photocurrent relative to the antennaless graphene device. The antenna contributes to the photocurrent in two ways: by the transfer of hot electrons generated in the antenna structure upon plasmon decay, as well as by direct plasmon-enhanced excitation of intrinsic graphene electrons due to the antenna near field. This results in a graphene-based photodetector achieving up to 20% internal quantum efficiency in the visible and near-infrared regions of the spectrum. This device can serve as a model for merging the light-harvesting characteristics of optical frequency antennas with the highly attractive transport properties of graphene in new optoelectronic devices.

引用

页码：3808 / 3813

页数：6

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