Observation of Electro-Optic Pockels Effect at the Amorphous TiO2 and Metal Interface

Sur, Soutik and Venkataraman, V (2018) Observation of Electro-Optic Pockels Effect at the Amorphous TiO2 and Metal Interface. In: PHYSICAL REVIEW APPLIED, 10 (1).

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Abstract

The Pockels effect is theoretically forbidden in centrosymmetric media. However, centrosymmetry is broken at the interface and second-order nonlinear effects such as the Pockels effect can be detected. In this work, we report the experimental observation of the Pockels effect at the interface of two isotropic solids, amorphous sol-gel spin-coated TiO2 and polycrystalline magnetron-sputtered metal. A micronthick voltage-driven Fabry-Perot resonator is designed using these materials to experimentally detect the optical response of their interface to an applied electric field. Using the experimental data, nonlinear two-dimensional susceptibility. chi((2))(2D)(omega; omega, 0) for the interface is obtained with two different theoretical approaches and found to be 3.5 +/- 1.9 x 10(7) pm(2)/V. The order of magnitude is similar to a recent report of. chi((2))(surface)(2 omega; omega, omega) similar to 10(6) pm(2)/V for the silicon-air interface obtained from surface second-harmonic generation measurements. Isotropy usually prohibits the design of thin-film active photonic components, such as electro-optic modulators, using amorphous materials which can be deposited by simple sol-gel spin coating or sputtering. Our demonstration of the Pockels effect at the TiO2 and metal interface presents it as a new electro-optic material with potential applications for integrated active plasmonic devices.

Item Type:	Journal Article
Publication:	PHYSICAL REVIEW APPLIED
Publisher:	AMER PHYSICAL SOC, ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
Additional Information:	Copyright of this article belong to AMER PHYSICAL SOC, ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
Department/Centre:	Division of Physical & Mathematical Sciences > Physics
Date Deposited:	08 Aug 2018 18:15
Last Modified:	08 Aug 2018 18:15
URI:	http://eprints.iisc.ac.in/id/eprint/60379

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