Superconducting Acousto-optic Phase Modulator

• URL: http://arxiv.org/abs/2104.11508v1
• Date: Fri, 23 Apr 2021 09:49:53 GMT
• Title: Superconducting Acousto-optic Phase Modulator
• Abstract summary: We report the development of a superconducting acousto-optic phase modulator fabricated on a lithium niobate substrate. A simple extension of the current device is estimated to achieve an efficient modulation with $V_pi=$ 0.27 V.
• Score: 2.491548831032455
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: We report the development of a superconducting acousto-optic phase modulator fabricated on a lithium niobate substrate. A titanium-diffused optical waveguide is placed in a surface acoustic wave resonator, where the electrodes for mirrors and an interdigitated transducer are made of a superconducting niobium titanium nitride thin film. The device performance is evaluated as a substitute for the current electro-optic modulators, with the same fiber coupling scheme and comparable device size. Operating the device at a cryogenic temperature (T=8K), we observe the length-half-wave-voltage (length-$V_\pi$) product of 1.78 V$\cdot$cm. Numerical simulation is conducted to reproduce and extrapolate the performance of the device. An optical cavity with mirror coating on the input/output facets of the optical waveguide is tested for further enhancement of the modulation efficiency. A simple extension of the current device is estimated to achieve an efficient modulation with $V_\pi=$ 0.27 V.

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