Inverse design and demonstration of broadband grating couplers

2018/08/23 by Sapra, Neil V., Vercruysse, Dries, Su, Logan +4 · 1 citation
#Applied Physics (physics.app-ph) #FOS: Physical sciences

paper · doi:10.48550/arxiv.1808.07630

Abstract

We present a gradient-based optimization strategy to design broadband grating couplers. Using this method, we are able to reach, and often surpass, a user-specified target bandwidth during optimization. The designs produced for 220 nm silicon-on-insulator are capable of achieving 3 dB bandwidths exceeding 100 nm while maintaining central coupling efficiencies ranging from -3.0 dB to -5.4 dB, depending on partial-etch fraction. We fabricate a subset of these structures and experimentally demonstrate gratings with 3 dB bandwidths exceeding 120 nm. This inverse design approach provides a flexible design paradigm, allowing for the creation of broadband grating couplers without requiring constraints on grating geometry.

Cited by

• A broadband, individually addressing two- and three-dimensional photonic integrated circuit for trapped-ion qubit control

Related

• Inverse-designed broadband low-loss grating coupler on thick lithium-niobate-on-insulator platform
• Inverse-Designed Grating Couplers with Tunable Wavelength via Scaling and Biasing
• Strategies for optimizing plasmonic grating couplers with topology-based inverse design
• High-efficiency grating couplers for pixel-level flat-top beam generation
• Ultracompact Low-Loss Grating Couplers