Abstract
We developed a surface plasmon resonance (SPR)-enhanced angular
Goos–Hänchen (GH) shift measurement system capable of tracking small
refractive index changes with high sensitivity in a liquid
environment. Our method can be performed in angular interrogation
schemes, where we demonstrate a simple zero-finding algorithm to
locate the SPR angle instead of the complicated data processing
algorithms used in conventional sensors. We also propose a displacement interrogation scheme for dynamic
measurement of small refractive index changes in the sample. The main
advantage of our method is the controllability of the measured
displacement by standard geometrical optics, allowing
measurement sensitivity enhancement without the need to modify the
sensor material.
Funder
Core Research for Evolutional Science and
Technology
Japan Society for the Promotion of
Science
Subject
Atomic and Molecular Physics, and Optics,Engineering (miscellaneous),Electrical and Electronic Engineering