Empirical model of optical sensing via spectral shift of circular Bragg phenomenon

Details Empirical model of optical sensing via spectral shift of circular Bragg phenomenon Empirical model of optical sensing via spectral shift of circular Bragg phenomenon

2009-12-21

arxiv.org/abs/0912.4138v1

IEEE Photonics Journal 2 (2010), 92-101

Physics

Optics

Scientific paper

Setting up an empirical model of optical sensing to exploit the circular Bragg phenomenon displayed by chiral sculptured thin films (CSTFs), we considered a CSTF with and without a central twist defect of $\pi/2$ radians. The circular Bragg phenomenon of the defect-free CSTF, and the spectral hole in the co-polarized reflectance spectrum of the CSTF with the twist defect, were both found to be acutely sensitive to the refractive index of a fluid which infiltrates the void regions of the CSTF. These findings bode well for the deployment of CSTFs as optical sensors.

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