Enhanced electro-optic beam deflection of relaxor ferroelectric KTN crystals by electric-field-induced high permittivity

Chang Jiang Chen, Ju Hung Chao, Yun Goo Lee, Annan Shang, Ruijia Liu, Shizhuo Yin, Robert C. Hoffman

Research output: Contribution to journalArticle

3 Scopus citations

Abstract

Most applications of a ferroelectric-based electro-optic (EO) beam deflector have been limited by the high applied voltage. In this Letter, we report a dramatically increased EO beam deflection in relaxor ferroelectric potassium tantalate niobate (KTN) crystals by using the electric-field-enhanced permittivity. Due to the existence of the electric-field-induced phase transition in relaxor ferroelectric materials, the dielectric permittivity can be substantially increased by the applied electric field at a certain temperature. Both the theoretical study and the experimental verifications on the enhanced beam deflection and EO effect in the case with the electric-field-induced high permittivity were conducted. The experimental results confirmed that there was a three-fold increase in the deflection angle, which represented a dramatic increase in the deflection angle. By offering a wider deflection range and a lower driving voltage, such a largely enhanced beam deflection is of great benefit to the KTN deflector.

Original languageEnglish (US)
Pages (from-to)5557-5560
Number of pages4
JournalOptics Letters
Volume44
Issue number22
DOIs
StatePublished - Nov 15 2019

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics

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