title: Single nanowire photoconductive terahertz detectors.
abstract: Spectroscopy and imaging in the terahertz (THz) region of the electromagnetic spectrum has proven to provide important insights in fields as diverse as chemical analysis, materials characterization, security screening, and nondestructive testing. However, compact optoelectronics suited to the most powerful terahertz technique, time-domain spectroscopy, are lacking. Here, we implement single GaAs nanowires as microscopic coherent THz sensors and for the first time incorporated them into the pulsed time-domain technique. We also demonstrate the functionality of the single nanowire THz detector as a spectrometer by using it to measure the transmission spectrum of a 290 GHz low pass filter. Thus, nanowires are shown to be well suited for THz device applications and hold particular promise as near-field THz sensors.
authors.affiliation: Department of Electronic Materials Engineering, Research School of Physics and Engineering, The Australian National University , Canberra, ACT 0200, Australia.
authors.forename: Kun
authors.initials: K
authors.lastname: Peng
authors.forename: Patrick
authors.initials: P
authors.lastname: Parkinson
authors.forename: Lan
authors.initials: L
authors.lastname: Fu
authors.forename: Qiang
authors.initials: Q
authors.lastname: Gao
authors.forename: Nian
authors.initials: N
authors.lastname: Jiang
authors.forename: Ya-Nan
authors.initials: YN
authors.lastname: Guo
authors.forename: Fan
authors.initials: F
authors.lastname: Wang
authors.forename: Hannah J
authors.initials: HJ
authors.lastname: Joyce
authors.forename: Jessica L
authors.initials: JL
authors.lastname: Boland
authors.forename: Hark Hoe
authors.initials: HH
authors.lastname: Tan
authors.forename: Chennupati
authors.initials: C
authors.lastname: Jagadish
authors.forename: Michael B
authors.initials: MB
authors.lastname: Johnston
keywords: Nanowire; nano-optics; terahertz optoelectronics; ultrafast