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Sensors 2017, 17(11), 2526; https://doi.org/10.3390/s17112526

Plasmonic Waveguide Coupled Ring Cavity for a Non-Resonant Type Refractive Index Sensor

Department of Physics, Chung-Ang University, Seoul 06974, Korea
Received: 29 September 2017 / Revised: 23 October 2017 / Accepted: 1 November 2017 / Published: 3 November 2017
(This article belongs to the Special Issue Surface Plasmon Resonance Sensing)
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Abstract

Sensitive refractive index sensors with small footprints have been studied to allow the integration of a large number of sensors into a tiny chip for bio/chemical applications. In particular, resonant-type index sensors based on various micro/nanocavities, which use a resonant wavelength dependence on the refractive index of the analyte, have been developed. However, the spectral linewidth of the resonance, which becomes the resolution limit, is considerably large in plasmonic cavities due to the large absorption loss of metals. Therefore, there is demand for a new type of plasmonic refractive index sensor that is not limited by the linewidth of the cavity. We propose a new type of plasmonic index sensors consisting of a channel waveguide and a ring cavity. Two emissions from the ring cavity in both directions of the waveguide couple with a reflection phase difference depending on the length of a closed right arm with a reflecting boundary. Therefore, the output power dramatically and sensitively changes as a function of the refractive index of the analyte filling the waveguide. View Full-Text
Keywords: plasmonics; whispering gallery mode; cavity; refractive index sensor plasmonics; whispering gallery mode; cavity; refractive index sensor
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Kwon, S.-H. Plasmonic Waveguide Coupled Ring Cavity for a Non-Resonant Type Refractive Index Sensor. Sensors 2017, 17, 2526.

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