THz gas sensing based on subwavelength rectangular metal grating in attenuated total reflection configuration

Research output: Chapter in Book/Report/Conference proceedingConference contributionResearchpeer-review

Abstract

The sensing performance of a subwavelength one-dimensional linear rectangular gold grating platform with the attenuate total reflection (Otto) coupling technique for gas detection has been numerically studied in the THz range. Grating parameters optimal for exciting surface plasmon resonances with maximum efficiency were found. Dispersion analysis of surface waves confirmed correctness of reflection spectrum simulations. The fundamental and 1st order modes of deep grooves demonstrated a very high sensitivity to a small refractive index change, up to 1.5 THz/RIU (in the frequency domain) and 557 deg/RIU (in the angular domain), with a refractive index detection limit of the sensor of 7.10-3 RIU and 1.5. 10-7 RIU, respectively. As compared with the fundamental modes, the high-order modes showed greater FOM values (up to 810 1/RIU for the 1st order) due to the sharpness of their resonances. These sensing characteristics are very promising for creating THz sensors based on subwavelength gratings.

Original languageEnglish
Title of host publicationSynchrotron and Free Electron Laser Radiation
Subtitle of host publicationGeneration and Application, SFR 2020
EditorsBoris Knyazev, Nikolay Vinokurov
PublisherAmerican Institute of Physics Inc.
ISBN (Electronic)9780735440333
DOIs
Publication statusPublished - 17 Nov 2020
Event2020 Internetional Conference on Synchrotron and Free Electron Laser Radiation: Generation and Application, SFR 2020 - Novosibirsk, Russian Federation
Duration: 13 Jul 202016 Jul 2020

Publication series

NameAIP Conference Proceedings
Volume2299
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Conference

Conference2020 Internetional Conference on Synchrotron and Free Electron Laser Radiation: Generation and Application, SFR 2020
CountryRussian Federation
CityNovosibirsk
Period13.07.202016.07.2020

Fingerprint

Dive into the research topics of 'THz gas sensing based on subwavelength rectangular metal grating in attenuated total reflection configuration'. Together they form a unique fingerprint.

Cite this