| 1 | Unidirectional reflection from an integrated“taiji”microresonator显示文摘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 | 2020 | Photonics Research2020，8，8： | 1 |
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