Journal
OPTICS EXPRESS
Volume 20, Issue 28, Pages 29605-29612Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.20.029605
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Funding
- National Research Foundation of Korea (NRF)
- Korea government (MEST) [2008-0062257, 2010-0009070]
- Grant of the Korean Health Technology RD Project
- Ministry for Health, Welfare & Family Affairs of Korea [A101954]
- National Research Foundation of Korea [2010-0009070] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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A single groove in a parallel-plate waveguide (PPWG) has been applied to a tunable terahertz (THz) notch filter with a transverse-electromagnetic (TEM) mode. When the air gap between the metal plates of the PPWG is controlled from 60 to 240 mu m using a motor controlled translation stage or a piezo-actuator, the resonant frequency of the notch filter is changed from 1.75 up to 0.62 THz, respectively. Therefore, the measured tunable sensitivity of the notch filter increases to 6.28 GHz/mu m. The measured resonant frequencies were found to be in good agreement with the calculation using an effective groove depth. Using a finite-difference time-domain (FDTD) simulation, we also demonstrate that the sensitivity of a THz microfluidic sensor can be increased via a small air gap, a narrow groove width, and a deep groove depth. (C) 2012 Optical Society of America
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