Unidirectional reflection from an integrated “taiji” microresonator

Year: 2020

Authors: Calabrese A., Ramiro-Manzano F., Price HM., Biasi S., Bernard M., Ghulinyan M., Carusotto I., Pavesi L.

Autors Affiliation: Univ Paris, CNRS, Paris Sci & Lettres, Lab Phys,Ecole Normale Super,ENS, F-75005 Paris, France; Inst Tecnol Quim CSIC UPV, Av Naranjos, Valencia 46022, Spain; Univ Birmingham, Sch Phys & Astron, Birmingham B15 2TT, W Midlands, England; Univ Trento, Dipartimento Fis, Nanosci Lab, Via Sommar 14, I-38123 Povo, TN, Italy; Fdn Bruno Kessler, Ctr Mat & Microsyst, Via Sommar 18, I-38123 Povo, TN, Italy; Univ Trento, INO CNR BEC Ctr, Via Sommar 14, I-38123 Povo, Italy; Univ Trento, Dept Phys, Via Sommar 14, I-38123 Povo, Italy.

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. (C) 2020 Chinese Laser Press

Journal/Review: PHOTONICS RESEARCH

Volume: 8 (8)      Pages from: 1333  to: 1341

More Information: Provincia Autonoma di Trento, Italy (Grandi Progetti SIQURO); H2020-FETFLAG-2018-2020 Quantum Flagship (820392 “PhoQuS”); FET-Open (n.737017 “MIR-BOSE”); Spanish Ministry of Economy, Industry and Competitiveness (MINECO) (TEC2015-74405-JIN); European Commission (Marie Sklodowska-Curie Action, Grant No. 656093 “SynOptic”); Royal Society (UF160112, RGF/EA/180121, and RGF/R1/180071).
KeyWords: Reciprocity; photonic device; microcavity
DOI: 10.1364/PRJ.393070

Citations: 25
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