title: Refractive index modulating Raman spectroscopy based on perovskite PMN-PT ceramics.
abstract: A three-layer planar waveguide structure comprising a perovskite (1-x)Pb(Mg1/3Nb2/3Nb2/3)O3-xPbTiO3(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  cm-1is 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.
authors.forename: Danzhu
authors.initials: D
authors.lastname: Wei
authors.forename: Tian
authors.initials: T
authors.lastname: Xu
authors.forename: Li
authors.initials: L
authors.lastname: Yuan
authors.forename: Shu
authors.initials: S
authors.lastname: Tian
authors.forename: Jinghuai
authors.initials: J
authors.lastname: Fang
authors.forename: Yonglong
authors.initials: Y
authors.lastname: Jin
authors.forename: Chaonan
authors.initials: C
authors.lastname: Wang
authors.forename: Xinxiang
authors.initials: X
authors.lastname: Ma
authors.forename: Jianzhen
authors.initials: J
authors.lastname: Shi