Open AccessTerahertz photodetector based on double-walled carbon nanotube macrobundle–metal contacts
Author(s) -
Yingxin Wang,
Xiangquan Deng,
Guowei Zhang,
Jin Wei,
JiaLin Zhu,
Zhiqiang Chen,
Ziran Zhao,
Jiandong Sun
Publication year - 2015
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.23.013348
Subject(s) - terahertz radiation , materials science , photodetector , photocurrent , carbon nanotube , optoelectronics , optics , electrode , detector , terahertz spectroscopy and technology , polarization (electrochemistry) , photoconductivity , nanotechnology , physics , chemistry , quantum mechanics
We report on the characterization of a terahertz (THz) photodetector with an extremely simple structure consisting of only a macroscopic bundle of double-walled carbon nanotubes (DWCNTs) suspended between two metal electrodes. Polarization-sensitive, broadband, and significant photoresponse occurring at the DWCNT-metal contacts under THz illumination are observed with room-temperature photocurrent and photovoltage responsivities up to ∼16 mA/W and ∼0.2 V/W at 2.52 THz, respectively. Scanning photocurrent measurements provide evidence that the photothermoelectric mechanism dominates the detector response. The simple geometry and compact nature of our device make it suitable for integration and show promising applications for THz detection.