Abstract

Low-loss conversion among a complete and orthogonal set of optical modes is important for high-bandwidth quantum and classical communication. In this Letter, we explore tunable impedance mismatch between coupled Fabry–Perot resonators as a powerful tool for manipulation of the spatial and temporal properties of optical fields. In the single-mode regime, frequency-dependent impedance matching enables tunable finesse optical resonators. Introducing the spatial dependence of the impedance mismatch enables coherent spatial mode conversion of optical photons at near-unity efficiency. We experimentally demonstrate a NIR resonator whose finesse is tunable over a decade, and an optical mode converter with efficiency ${\gt}75\%$ for the first six Hermite–Gauss modes. We anticipate that this new perspective on coupled multimode resonators will have exciting applications in micro- and nano-photonics and computer-aided inverse design.

© 2020 Optical Society of America

Optically tunable Fano resonance in a grating-based Fabry–Perot cavity-coupled microring resonator on a silicon chip

Weifeng Zhang, Wangzhe Li, and Jianping Yao
Opt. Lett. 41(11) 2474-2477 (2016)

Transversely coupled Fabry–Perot resonators with Bragg grating reflectors

Md Ghulam Saber, Yun Wang, Eslam El-Fiky, David Patel, Kh Arif Shahriar, Md Samiul Alam, Maxime Jacques, Zhenping Xing, Luhua Xu, Nicolás Abadía, and David V. Plant
Opt. Lett. 43(1) 13-16 (2018)

Counter-propagating modes in a Fabry–Perot-type resonator

Markus Pollnau
Opt. Lett. 43(20) 5033-5036 (2018)

Ultra-low-loss nanofiber Fabry–Perot cavities optimized for cavity quantum electrodynamics

S. K. Ruddell, K. E. Webb, M. Takahata, S. Kato, and T. Aoki
Opt. Lett. 45(17) 4875-4878 (2020)

Tunable Fano-like resonances in a bent single-mode waveguide-based Fabry–Perot resonator

Anton V. Dyshlyuk
Opt. Lett. 44(2) 231-234 (2019)