Article

Applied Physics A

, Volume 104, Issue 3, pp 765-768

Experimental comparison between intensity and phase detection sensitivities of grating coupling surface plasmon resonance

  • Wen-Kai KuoAffiliated withDepartment of Electro-Optics Engineering, National Formosa University Email author 
  • , Chih-Hao ChangAffiliated withDepartment of Electro-Optics Engineering, National Formosa University

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Abstract

This paper experimentally compares the intensity and phase detection sensitivities of grating coupling surface plasmon resonance (SPR). A simple air-heating method is proposed to implement tiny refractive index changes. An electro-optic heterodyne interferometer is used to obtain both the intensity and phase curves of the grating coupling SPR device. The transient reflectivity and phase curves during the heating process are recorded. The result shows that the phase detection sensitivity is much better than that of the intensity by an order of magnitude.