文档介绍：Sensors and Actuators B 100 (2004) 423–431
Absorption-based fiber optic surface plasmon resonance sensor:
a theoretical evaluation
Anuj K. Sharma, . Gupta∗
Department of Physics, Indian Institute of Technology Delhi, New Delhi 110016, India
Received 12 December 2003; received in revised form 29 January 2004; accepted 6 February 2004
Available online 21 April 2004
Abstract
In this paper, an optical absorption based fiber optic surface plasmon resonance (SPR) sensor has been studied theoretically. The theoretical
treatment is based on Kretschmann’s SPR theory and the Lorentz model that expresses a damped harmonic oscillator is included in the
treatment for optical absorption in the sensing layer. The optical source considered is an un-polarized collimated beam. The light is coupled
to the fiber using a microscope objective that focuses the beam at the center of the input face of the fiber. The effects of the parameters related
to the sensing region, the light source and the optical fiber on the sensitivity and the operating range of the SPR sensor have been studied
with the help of numerical calculations puter simulations. It has been found that the excitation frequency in absorption-based
fiber optic SPR sensor is an important parameter. The sensitivity is better for the lower off-resonance excitation frequency. The sensitivity
and the operating range of the s