Designing metasurface optical interfaces for solid-state qubits using many-body adjoint shape optimization

TL;DR

This paper introduces a versatile inverse design method for metasurfaces that efficiently couple light from solid-state qubits, enhancing scalable quantum photonic interfaces with practical fabrication constraints.

Contribution

It presents a novel many-body adjoint shape optimization approach that explicitly incorporates material and fabrication constraints in metasurface design.

Findings

Designed a metasurface for nitrogen-vacancy centers in diamond

Achieved efficient photon collection and collimation

Method applicable to various solid-state qubits

Abstract

We present a general strategy for the inverse design of metasurfaces composed of elementary shapes. We use it to design a structure that collects and collimates light from nitrogen-vacancy centers in diamond. Such metasurfaces constitute scalable optical interfaces for solid-state qubits, enabling efficient photon coupling into optical fibers and eliminating free-space collection optics. The many-body shape optimization strategy is a practical alternative to topology optimization that explicitly enforces material and fabrication constraints throughout the optimization, while still achieving high performance. The metasurface is easily adaptable to other solid-state qubits, and the optimization method is broadly applicable to fabrication-constrained photonic design problems.