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Sensors 2012, 12(10), 14144-14157; doi:10.3390/s121014144

Numerical Study of Opto-Fluidic Ring Resonators for Biosensor Applications

1 Department of Biosystems Engineering, Chungbuk National University, Cheongju 361-763, Korea 2 Department of Physics, Daegu University, Gyungsan 712-714, Korea
* Author to whom correspondence should be addressed.
Received: 22 August 2012 / Revised: 8 October 2012 / Accepted: 17 October 2012 / Published: 22 October 2012
(This article belongs to the Section Biosensors)
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The opto-fluidic ring resonator (OFRR) biosensor is numerically characterized in whispering gallery mode (WGM). The ring resonator includes a ring, a waveguide and a gap separating the ring and the waveguide. Dependence of the resonance characteristics on the resonator size parameters such as the ring diameter, the ring thickness, the waveguide width, and the gap width between the ring and the waveguide are investigated. For this purpose, we use the finite element method with COMSOL Multiphysics software to solve the Maxwell’s equations. The resonance frequencies, the free spectral ranges (FSR), the full width at half-maximum (FWHM), finesse (F), and quality factor of the resonances (Q) are examined. The resonant frequencies are dominantly affected by the resonator diameter while the gap width, the ring thickness and the waveguide width have negligible effects on the resonant frequencies. FWHM, the quality factor Q and the finesse F are most strongly affected by the gap width and moderately influenced by the ring diameter, the waveguide width and the ring thickness. In addition, our simulation demonstrates that there is an optimum range of the waveguide width for a given ring resonator and this value is between ~2.25 μm and ~2.75 μm in our case.
Keywords: ring resonator; whispering gallery mode; waveguide ring resonator; whispering gallery mode; waveguide
This is an open access article distributed under the Creative Commons Attribution License (CC BY) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Cho, H.K.; Han, J. Numerical Study of Opto-Fluidic Ring Resonators for Biosensor Applications. Sensors 2012, 12, 14144-14157.

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