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Non-Magnetic On-Chip Resonant Acousto-Optic Isolator at 780 nm
Technical Report,09 Nov 2015,01 Jul 2017
University of Illinois Urbana United States
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The goal of this project was to demonstrate a lithographically defined proof-of-concept optical isolator on-chip, without the use of magneticfields or magneto-optical materials. Our technical approach was to employ momentum-conservation in photon-phonon interactions to breakthe propagation symmetry of light using a unidirectional acoustic pump. This acoustic wave was transduced using an RF-driven SAWactuator on a piezoelectric substrate. We fabricated the device using only CMOS-compatible dielectric materials with the assistance of e-beamlithopgraphy. The final device operated as a frequency-shifting isolator near 1550 nm telecom wavelength and exhibited 15 dB ofnon-reciprocal contrast with 7.7 dB insertion loss. We also demonstrated on-chip components that would permit implementation of thisisolator at 780 nm for cold-atom microsystems applications, laying out paths for future development and improvements.
APPROVED FOR PUBLIC RELEASE