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Unidirectional reflection from an integrated 'taiji' microresonator

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Valencià Castellano

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Unidirectional reflection from an integrated 'taiji' microresonator

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Calabrese, A.; Ramiro Manzano, Fernando; Price, H. M.; Biasi, Stefano; Bernard, Martino; Ghulinyan, Mher; Carusotto, Iacopo; Pavesi, Lorenzo

Aquest document és un/a article, creat/da en: 2020

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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