Nonuniform distribution of point defects in ferroelectric phononic crystal (original) (raw)

The Journal of the Acoustical Society of America, 2017

Abstract

The photoluminescence (PL) from point defects in ferroelectric phononic crystal (FPC) is investigated at room temperature. The FPC consists of periodically poled domains 0.45-mm-long each along the x-axis in the 0.5-mm-thick z-cut LiNbO3 wafer. The spectra of PL are excited by 310 nm ultraviolet light and registered in the range of 350 to 900 nm. The PL spectra reveal different point defects including F-center, Ba, Ar, Ne, Cr, K, Fe+, Xe, and others. The electrically active defects such as F-center and Fe+ are expected to be sensitive on a local electric polarization. In a FPC, the ferroelectric neighboring domains are inversely poled and have an opposite electric polarization. The change from polarization “up” to polarization “down” happens across so called interdomain wall. The point defect concentrations along the neighboring domains are researched by PL-scanning, consisting of taking PL-spectra from narrow zones across the domain structure along the x-axis. This scanning reveal a nonuniform distributi...

Igor Ostrovskii hasn't uploaded this paper.

Let Igor know you want this paper to be uploaded.

Ask for this paper to be uploaded.