Surface polaritons and phonon spectrum of sodium chlorate crystal

Abstract Phonon spectrum of sodium chlorate (NaClO 3 ) single crystal was studied using Raman scattering, infrared reflectivity, surface polariton (SP) dispersion and surface electromagnetic wave (SEW) measurements. Complex dielectric function was obtained from reflectivity spectra using Lorentz oscillator fit and Kramers-Kronig analysis. Parameters of Lorentz oscillators are in a good agreement with Raman measurements and with SP dispersion obtained from ATR spectra. First time SEW measurements on NaClO 3 -air interface were made in CO 2 laser tuning region to obtain complex dielectric function of NaClO 3 in 10 μm region. SEW propagation length approaches 50 μm at 967 cm −1 . Experimental values of SEW effective refractive index and propagation length are in a good agreement with the data calculated using complex dielectric function obtained from reflectivity.