Topologically protected frequency control of broadband signals in dynamically modulated waveguide arrays

Year: 2022

Authors: Piccioli F.S.; Szameit A.; Carusotto I.

Autors Affiliation: INO-CNR BEC Center and Dipartimento di Fisica, Universitb di Trento, I-38123 Trento, Italy; Institute for Physics, University of Rostock, Albert-Einstein-Str. 23, Rostock, D-18059, Germany

Abstract: We theoretically propose a synthetic frequency dimension scheme to control the spectrum of a light beam propagating through an array of evanescently coupled waveguides modulated in time by a propagating sound wave via the acousto-optical effect. Configurations are identified where the emerging two-dimensional synthetic space-frequency lattice displays a nontrivial topological band structure. The corresponding chiral edge states can be exploited to manipulate the frequency spectrum of an incident beam in a robust way. In contrast to previous works, our proposal is not based on discrete high-Q cavity modes and can be applied to the manipulation of broadband signals with arbitrary spectra.


Volume: 105 (5)      Pages from: 053519-1  to: 053519-9

More Information: F.S.P. acknowledges funding from Deutscher Akademischer Austauschdienst (Grant No. 57507869). I.C. and F.S.P. acknowledge financial support from the European Union H2020-FETFLAG-2018-2020 project “PhoQuS” (Project No. 820392) and from the Provincia Autonoma di Trento, partly through the Q@TNinitiative.A.S.acknowledges funding from the Deutsche Forschungsgemeinschaft (Grants No. SCHE 612/6-1, No. SZ 276/12-1, No. BL 574/13-1, No. SZ 276/15-1, and No. SZ 276/20-1) and the Alfried Krupp von Bohlen and Halbach Foundation. F.S.P. thanks Alberto Nardin for fruitful discussions.
KeyWords: resonators; lattices
DOI: 10.1103/PhysRevA.105.053519