Photonics Research, 2020, 8 (8): 08001333, Published Online: Jul. 21, 2020
Unidirectional reflection from an integrated “taiji” microresonator Download: 512次
Abstract
We study light transmission and reflection from an integrated microresonator device, formed by a circular microresonator coupled to a bus waveguide, with an embedded S-shaped additional crossover waveguide element that selectively couples counter-propagating modes in a propagation-direction-dependent way. The overall shape of the device resembles a “taiji” symbol, hence its name. While Lorentz reciprocity is preserved in transmission, the peculiar geometry allows us to exploit the non-Hermitian nature of the system to obtain high-contrast unidirectional reflection with negligible reflection for light incident in one direction and a significant reflection in the opposite direction.
A. Calabrese, F. Ramiro-Manzano, H. M. Price, S. Biasi, M. Bernard, M. Ghulinyan, I. Carusotto, L. Pavesi. Unidirectional reflection from an integrated “taiji” microresonator[J]. Photonics Research, 2020, 8(8): 08001333.