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Terahertz microfluidic sensor based on a parallel-plate waveguide resonant cavity

Appl. Phys. Lett. 95, 171113 (2009); doi:10.1063/1.3251079

Published 30 October 2009

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Rajind Mendis, Victoria Astley, Jingbo Liu, and Daniel M. Mittleman
Department of Electrical and Computer Engineering, Rice University, MS-366, 6100 Main Street, Houston, Texas 77005, USA
We describe a terahertz optical resonator that is ideally suited for highly sensitive and noninvasive refractive-index monitoring. The resonator is formed by machining a rectangular groove into one plate of a parallel-plate waveguide, and is excited using the lowest-order transverse-electric (TE1) waveguide mode. Since the resonator can act as a channel for fluid flow, it can be easily integrated into a microfluidics platform for real-time monitoring. Using this resonator with only a few microliters of liquid, we demonstrate a refractive-index sensitivity of 3.7×105  nm/refractive-index-unit, the highest ever reported in any frequency range. ©2009 American Institute of Physics
History: Received 24 August 2009; accepted 29 September 2009; published 30 October 2009
Permalink: http://link.aip.org/link/?APPLAB/95/171113/1
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KEYWORDS and PACS

Keywords
PACS
  • 42.79.Pw
    Imaging detectors and sensors
  • 42.79.Gn
    Optical waveguides and couplers
  • 07.07.Df
    Sensors (chemical, optical, electrical, movement, gas, etc.); remote sensing
  • YEAR: 2009

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PUBLICATION DATA

ISSN:
0003-6951 (print)   1077-3118 (online)
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