Interpretable inverse-designed cavity for on-chip nonlinear and quantum optics

Zhetao Jia¹, Wayesh Qarony¹, Jagang Park¹, Sean Hooten², Difan Wen^1,3, Yertay Zhiyenbayev¹, Matteo Seclì¹, Walid Redjem¹, Scott Dhuey⁴, Adam Schwartzberg⁴, Eli Yablonovitch¹, and Boubacar Kanté^1,5
arXiv:2308.03036 – Submitted 06 Aug 2023
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Abstract

Inverse design is a powerful tool in wave-physics and in particular in photonics for compact, high-performance devices. To date, applications have mostly been limited to linear systems and it has rarely been investigated or demonstrated in the nonlinear regime. In addition, the "black box" nature of inverse design techniques has hindered the understanding of optimized inverse-designed structures. We propose an inverse design method with interpretable results to enhance the efficiency of on-chip photon generation rate through nonlinear processes by controlling the effective phase-matching conditions. We fabricate and characterize a compact, inverse-designed device using a silicon-on-insulator platform that allows a spontaneous four-wave mixing process to generate photon pairs at 1.1MHz with a coincidence to accidental ratio of 162. Our design method accounts for fabrication constraints and can be used for scalable quantum light sources in large-scale communication and computing applications.

PACS: 03.65.Vf, 42.60.Da, 42.65.Sf, 73.43.-f

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1. Department of Electrical Engineering and Computer Sciences, University of California, Berkeley, CA 94720, USA ↩ ↩² ↩³ ↩⁴ ↩⁵ ↩⁶ ↩⁷ ↩⁸ ↩⁹

2. Hewlett Packard Labs, Hewlett Packard Enterprise, 820 N. McCarthy Blvd., Milpitas, California 95035, USA ↩

3. Applied Science and Technology Graduate Group, University of California at Berkeley, Berkeley, California 94720, USA ↩

4. Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA ↩ ↩²

5. Materials Sciences Division, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA 94720, USA ↩