Wang Xi, Jefferson Michael, Hobbs Philip C D, Risk William P, Feller Bob E, Miller Robert D, Knoesen André
Department of Electrical and Computer Engineering, University of California, Davis, Davis, CA 95616, USA.
Opt Express. 2011 Jan 3;19(1):107-17. doi: 10.1364/OE.19.000107.
It is demonstrated that surface plasmon sensing can be performed in the shot-noise-limited regime to resolve index of refractive changes on the order of 10/√Hz at input powers of 1 mW. This improved resolution is achieved by using active electronic noise cancelling to suppress laser intensity noise and a wavelength that maximizes sensitivity to index of refraction changes occurring at an interface. The resolution of the system is experimentally demonstrated by measuring the refractive index change of air in response to pressure changes.
结果表明，表面等离子体传感可以在散粒噪声限制的条件下进行，以分辨输入功率为1 mW时约为10/√Hz量级的折射率变化。通过使用有源电子噪声消除技术来抑制激光强度噪声，并采用使对界面处折射率变化的灵敏度最大化的波长，实现了这种更高的分辨率。通过测量空气折射率随压力变化的响应，对该系统的分辨率进行了实验验证。
