eprintid: 1558275
rev_number: 26
eprint_status: archive
userid: 608
dir: disk0/01/55/82/75
datestamp: 2017-06-01 14:59:34
lastmod: 2021-10-07 21:56:07
status_changed: 2017-09-14 11:27:51
type: article
metadata_visibility: show
creators_name: Thompson, RJ
creators_name: Siday, T
creators_name: Glass, S
creators_name: Luk, TS
creators_name: Reno, JL
creators_name: Brener, I
creators_name: Mitrofanov, O
title: Optically thin hybrid cavity for terahertz photo-conductive detectors
ispublished: pub
divisions: UCL
divisions: B04
divisions: C05
divisions: F46
keywords: Science & Technology, Physical Sciences, Physics, Applied, Physics, GAAS, OPTOELECTRONICS, GENERATION, ANTENNAS, DEVICES
note: This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions.
abstract: The efficiency of photoconductive (PC) devices, including terahertz detectors, is constrained by the bulk optical constants of PC materials. Here, we show that optical absorption in a PC layer can be modified substantially within a hybrid cavity containing nanoantennas and a Distributed Bragg Reflector. We find that a hybrid cavity, consisting of a GaAs PC layer of just 50 nm, can be used to absorb >75% of incident photons by trapping the light within the cavity. We provide an intuitive model, which describes the dependence of the optimum operation wavelength on the cavity thickness. We also find that the nanoantenna size is a critical parameter, small variations of which lead to both wavelength shifting and reduced absorption in the cavity, suggesting that impedance matching is key for achieving efficient absorption in the optically thin hybrid cavities.
date: 2017-01-23
date_type: published
publisher: AMER INST PHYSICS
official_url: http://dx.doi.org/10.1063/1.4974482
oa_status: green
full_text_type: pub
language: eng
primo: open
primo_central: open_green
article_type_text: Article
verified: verified_manual
elements_id: 1210216
doi: 10.1063/1.4974482
lyricists_name: Mitrofanov, Oleg
lyricists_name: Thompson, Robert
lyricists_id: OMITR95
lyricists_id: RJTHO70
actors_name: Dewerpe, Marie
actors_id: MDDEW97
actors_role: owner
full_text_status: public
publication: Applied Physics Letters
volume: 110
number: 4
pages: 5
issn: 1077-3118
citation:        Thompson, RJ;    Siday, T;    Glass, S;    Luk, TS;    Reno, JL;    Brener, I;    Mitrofanov, O;      (2017)    Optically thin hybrid cavity for terahertz photo-conductive detectors.                   Applied Physics Letters , 110  (4)      10.1063/1.4974482 <https://doi.org/10.1063/1.4974482>.       Green open access   
 
document_url: https://discovery.ucl.ac.uk/id/eprint/1558275/1/Mitrofanov_1%25252E4974482.pdf