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Updated: May 8, 2026

Spectral and Angle-Resolved Magneto-Optical Characterization of Photonic Nanostructures
Published on: November 21, 2019
Kovacs effect enhanced broadband large field of view electro-optic modulators in nanodisordered KTN crystals
Yun-Ching Chang1, Chao Wang, Shizhuo Yin
1Department of Electrical Engineering, The Pennsylvania State University, University Park, PA 16802, USA.
Abstract:
The unique physical effect-Kovacs effect is explored to enhance the performance of EO modulators by employing the non-thermal equilibrium state nanodisordered KTN crystals created by super-cooling process, which can have a significant 3.5 fold increase in quadratic electro-optic coefficient. This enables to reduce the switching half wave voltage (almost by half) so that a broadband (~GHz range) and large field of view (+/-30 deg) electro-optic modulator can be realized with much lowered driving power, which can be very useful for a variety of applications: laser Q-switches, laser pulse shaping, high speed optical shutters and modulating retro reflectors.
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