Refractive index sensing at one wavelength via an active plasmonic device

Hiroyuki Okamoto; Kenzo Yamaguchi; Minoru Komatsu

doi:10.1117/1.JNP.12.046011

30 October 2018 Refractive index sensing at one wavelength via an active plasmonic device

Hiroyuki Okamoto, Kenzo Yamaguchi, Minoru Komatsu

Author Affiliations +

Journal of Nanophotonics, Vol. 12, Issue 4, 046011 (October 2018). https://doi.org/10.1117/1.JNP.12.046011

Abstract

A method is presented that senses a refractive index by way of an active device that varies the coupling coefficient between a plasmonic ring resonator and a movable bus waveguide. It requires only one wavelength and senses the refractive index of the medium that surrounds the resonator and the waveguide. The gap between the resonator and the waveguide is adjusted by moving the waveguide, which affects the coupling coefficient. The gap value is used to determine the refractive index. Numerical evaluation of the sensitivity revealed a refractive index change of 5 × 10^− 3 at a 633-nm wavelength for a controlled gap between 33.5 and 29.4 nm. This simple configuration was shown to be applicable for use in integrated photonic devices.

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Hiroyuki Okamoto, Kenzo Yamaguchi, and Minoru Komatsu "Refractive index sensing at one wavelength via an active plasmonic device," Journal of Nanophotonics 12(4), 046011 (30 October 2018). https://doi.org/10.1117/1.JNP.12.046011

Received: 28 February 2018; Accepted: 10 October 2018; Published: 30 October 2018

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