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Title: Photoconductive terahertz near-field detector with a hybrid nanoantenna array cavity

Journal Article · · ACS Photonics
 [1];  [2];  [2];  [2]
  1. Univ. College London, London (United Kingdom); Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
  2. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

Nanoscale structuring of optical materials leads to modification of their properties and can be used for improving efficiencies of photonic devices and for enabling new functionalities. In ultrafast optoelectronic switches for generation and detection of terahertz (THz) radiation, incorporation of nanostructures allows us to overcome inherent limitations of photoconductive materials. We propose and demonstrate a nanostructured photoconductive THz detector for sampling highly localized THz fields, down to the level of λ/150. The nanostructure that consists of an array of optical nanoantennas and a distributed Bragg reflector forms a hybrid cavity, which traps optical gate pulses within the photoconductive layer. The effect of photon trapping is observed as enhanced absorption at a designed wavelength. This optically thin photoconductive THz detector allows us to detect highly confined evanescent THz fields coupled through a deeply subwavelength aperture as small as 2 μm (λ/150 at 1 THz). As a result, by monolithically integrating the THz detector with apertures ranging from 2 to 5 μm we realize higher spatial resolution and higher sensitivity in aperture-type THz near-field microscopy and THz time-domain spectroscopy.

Research Organization:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC04-94AL85000
OSTI ID:
1238657
Report Number(s):
SAND-2015-9128J; 608008
Journal Information:
ACS Photonics, Vol. 2, Issue 12; ISSN 2330-4022
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 60 works
Citation information provided by
Web of Science

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Cited By (16)

Enhancement of terahertz photoconductive antenna operation by optical nanoantennas: Enhancement of terahertz photoconductive antenna operation by optical nanoantennas journal December 2016
High Sensitivity Terahertz Detection through Large-Area Plasmonic Nano-Antenna Arrays journal February 2017
Phase-sensitive terahertz imaging using room-temperature near-field nanodetectors journal January 2018
An efficient terahertz detector based on an optical hybrid cavity conference March 2018
Toward real-time terahertz imaging journal January 2018
Nanostructure-Enhanced Photoconductive Terahertz Emission and Detection journal August 2018
Photoconductive devices for terahertz pulsed spectroscopy: a review [Invited] journal January 2016
Near-field terahertz probes with room-temperature nanodetectors for subwavelength resolution imaging journal March 2017
Terahertz photoconductive emitter with dielectric-embedded high-aspect-ratio plasmonic grating for operation with low-power optical pumps journal January 2019
The progress and perspectives of terahertz technology for diagnosis of neoplasms: a review journal December 2019
A high-responsivity and broadband photoconductive terahertz detector based on a plasmonic nanocavity journal December 2018
Improvement of Terahertz Photoconductive Antenna using Optical Antenna Array of ZnO Nanorods journal February 2019
Perspective: Terahertz science and technology journal December 2017
Detection of internal fields in double-metal terahertz resonators journal February 2017
Near-field terahertz probes with room-temperature nanodetectors for subwavelength resolution imaging preprint January 2019
Tunable Terahertz Deep Subwavelength Imaging Based on a Graphene Monolayer journal April 2017