We propose a scheme to extend dynamic range of a Fabry-Perot (FP) resonator-based refractive index sensor while maintaining the sensitivity. We considered an intensiometric refractive index sensor using an FP resonator in a plasmonic waveguide which is formed by mode selective mirrors. Then, we demonstrated that the intensity degeneracy is a cause of small dynamic range. Lastly, we found that mode dependent transmission characteristics of the FP resonator and 180-degree phase shift across FP resonances can be exploited for extension of dynamic range.

Date Published: 1 July 2015
PDF: 4 pages
Proc. SPIE 9655, Fifth Asia-Pacific Optical Sensors Conference, 965521 (1 July 2015); doi: 10.1117/12.2184396

Published in SPIE Proceedings Vol. 9655:
Fifth Asia-Pacific Optical Sensors Conference
Byoungho Lee; Sang-Bae Lee; Yunjiang Rao, Editor(s)