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Characterization of SiN Integrated Optical Phased Arrays on a Wafer-Scale Test Station

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Superconducting acousto-optic phase modulator.

Ayato Okada, Rekishu Yamazaki, Maria Fuwa

|May 14, 2021

Summary

This summary is machine-generated.

Researchers developed a superconducting acousto-optic phase modulator using niobium titanium nitride on lithium niobate. This device offers a promising, efficient alternative to current electro-optic modulators, especially at cryogenic temperatures.

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Area of Science:

* Photonics and Materials Science
* Superconducting Devices
* Acousto-Optic Modulation

Background:

* Current electro-optic modulators face limitations in performance and efficiency.
* Lithium niobate is a key material for optical devices, but its electro-optic modulation can be improved.
* Superconducting materials offer unique properties for advanced device applications.

Purpose of the Study:

* To develop and evaluate a novel superconducting acousto-optic phase modulator.
* To assess its performance as a potential replacement for existing electro-optic modulators.
* To explore methods for enhancing modulation efficiency through optical cavity integration.

Main Methods:

* Fabrication of a device on a lithium niobate substrate with a titanium-diffused optical waveguide.
* Integration of a surface acoustic wave resonator with superconducting niobium titanium nitride electrodes.
* Cryogenic testing at 8 K to measure device performance, including the length-half-wave-voltage product.
* Numerical simulations to predict and extrapolate device behavior.
* Implementation of an optical cavity for efficiency enhancement.

Main Results:

* Achieved a length-half-wave-voltage product of 1.78 V·cm at 8 K.
* Demonstrated the feasibility of using superconducting niobium titanium nitride for acousto-optic modulation.
* Numerical simulations accurately reproduced experimental results and predicted future performance.
* Estimated potential for Vπ = 0.27 V with a simple extension incorporating an optical cavity.

Conclusions:

* The developed superconducting acousto-optic phase modulator shows significant potential.
* The device offers comparable performance to current modulators with enhanced efficiency possibilities.
* Superconducting materials integrated with acousto-optic principles represent a promising avenue for future photonic devices.