Approach the Angular Sensitivity Limit in Surface Plasmon Resonance Sensors with Low Index Prism and Large Resonant Angle
Journal
Optical Engineering
Journal Volume
49
Journal Issue
5
Pages
054403-054403-6
Date Issued
2010-05
Author(s)
Abstract
Surface plasmon resonance (SPR) sensors have been studied thoroughly for the past two decades. However, we found that the angular sensitivity in a prism-coupled SPR sensor can be as high as 500 deg/refractive index unit (RIU), which is two times higher than the sensitivity that has ever been achieved in previous studies. Such a high angular sensitivity can be fully achieved by simply choosing a proper low-index prism and a sufficiently large resonant angle for the light signal at an appropriate wavelength with an optimal metal film thickness. A feasible implementation of such an SPR sensor design concept was also proposed, and an even higher sensitivity of 600 deg/RIU can be achieved. © 2010 Society of Photo-Optical Instrumentation.
Subjects
biochemical optics; sensors; surface plasmons
SDGs
Other Subjects
Angular sensitivity; Light signal; Low index; Metal film; Resonant angle; SPR sensors; Surface plasmon resonance sensor; surface plasmons; Plasmons; Prisms; Sensors; Surface plasmon resonance
Type
journal article