Unidirectional reflection from an integrated “taiji” microresonator

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-dependen...

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Published in:Photonics research (Washington, DC) DC), 2020-08, Vol.8 (8), p.1333
Main Authors: Calabrese, A., Ramiro-Manzano, F., Price, H. M., Biasi, S., Bernard, M., Ghulinyan, M., Carusotto, I., Pavesi, L.
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creator Calabrese, A.
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description 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.
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title Unidirectional reflection from an integrated “taiji” microresonator
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