Journal
OPTICS EXPRESS
Volume 22, Issue 25, Pages 30467-30472Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.22.030467
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Funding
- Midcareer Researcher Program [2011-0016173]
- PRC Program [2009-0094046]
- Public Welfare & Safety Research Program, through National Research Foundation grant - Korea Government [2011-0020819]
- National Research Foundation of Korea [2014R1A2A1A11052108] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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We demonstrated sensitive detection of individual yeast cells and yeast films by using slot antenna arrays operating in the terahertz frequency range. Microorganisms located at the slot area cause a shift in the resonant frequency of the THz transmission. The shift was investigated as a function of the surface number density for a set of devices fabricated on different substrates. In particular, sensors fabricated on a substrate with relatively low permittivity demonstrate higher sensitivity. The frequency shift decreases with increasing slot antenna width for a fixed coverage of yeast film, indicating a field enhancement effect. Furthermore, the vertical range of the effective sensing volume has been studied by varying the thickness of the yeast film. The resonant frequency shift saturates at 3.5 mu m for a slot width of 2 mu m. In addition, the results of finite-difference time-domain simulations are in good agreement with our experimental data. (C) 2014 Optical Society of America
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