Refractive index modulating Raman spectroscopy based on perovskite PMN-PT ceramics

Abstract

A three-layer planar waveguide structure comprising a perovskite $(1-x)\mathrm{Pb}({\mathrm{Mg}}_{1/3}{\mathrm{Nb}}_{2/3}{\mathrm{Nb}}_{2/3}){\mathrm{O}}_{3-x}{\mathrm{PbTiO}}_3$ (PMN-PT) ceramic sandwiched by two silver films is designed and called PMPW. Using the high sensitivity of ultrahigh-order modes, theoretical analysis is performed to calculate the effective refractive index (ERI) of the PMPW. A detailed analysis of the Raman spectrum of PMN-PT at $795{\mathrm{cm}}^{-1}$ is performed. A comparison of the numerical analysis and experimental results reveals that the nonlinear change in ERI plays a primary role in the Raman signal variation. Analysis of the Raman spectrum of a sample deposited on PMPW confirms that it is effective for modulating Raman signals.

© 2016 Optical Society of America

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