Numerical optimization of refractive index sensors based on diffraction gratings with high aspect ratio in terahertz range

Research output: Contribution to journalArticlepeer-review

Abstract

Terahertz surface plasmon resonance (SPR) sensors have been regarded as a promising technology in biomedicine due to their real-time, label-free, and ultrasensitive monitoring features. Different authors have suggested a lot of SPR sensors, including those based on 2D and 3D metamate-rials, subwavelength gratings, graphene, and graphene nanotube, as well as others. However, one of the traditional approaches to realize high sensitivity SPR sensors based on metal diffraction gratings has been studied poorly in the terahertz frequency range. In this article, a linear metal rectangular diffraction grating with high aspect ratio is studied. The influence of the grating structure parameters on the sensor sensitivity is simulated. Effects arising from different ratios of depth and width were discovered and explained. The results show that the sensitivity can be increased to 2.26 THz/RIU when the refractive index range of the gas to measure is between 1 and 1.002 with the resolution 5 × 10−5 RIU.

Original languageEnglish
Article number172
JournalSensors
Volume22
Issue number1
DOIs
Publication statusPublished - 1 Jan 2022

Keywords

  • Linear diffraction gratings
  • Refractive index sensing
  • Surface plasmon resonance
  • Terahertz range
  • Surface Plasmon Resonance
  • Graphite
  • Refractometry
  • Equipment Design

OECD FOS+WOS

  • 1.04 CHEMICAL SCIENCES
  • 2.02.IQ ENGINEERING, ELECTRICAL & ELECTRONIC
  • 2.11.OA INSTRUMENTS & INSTRUMENTATION

Fingerprint

Dive into the research topics of 'Numerical optimization of refractive index sensors based on diffraction gratings with high aspect ratio in terahertz range'. Together they form a unique fingerprint.

Cite this