Controlled unidirectional reflection in cold atoms via the spatial Kramers-Kronig relation

Year: 2021

Authors: Zhang Y.; Wu J.-H.; Artoni M.; la Rocca G.C.

Autors Affiliation: School of Physics, Northeast Normal University, Changchun 130024, China; State Key Laboratory of Quantum Optics and Quantum Optics Devices, Shanxi University, Taiyuan 030006, China; Department of Engineering and Information Technology and Istituto Nazionale di Ottica (INO-CNR), Brescia University, 25133 Brescia, Italy; Scuola Normale Superiore and CNISM, 56126 Pisa, Italy

Abstract: It is known that the Kramers-Kronig (KK) relation between real and imaginary parts of the optical susceptibility in the frequency domain can also be realized in the space domain, as first proposed in [Nat. Photonics 9(7), 436 (2015)]. We here study a mechanism to implement spatial KK relations in a cold atomic sample and use it to control unidirectional reflectionless for probe light incident from either the left or right side of the sample at will. In our model, the complex frequency dependent atomic susceptibility is mapped into a spatially dependent one, employing a far-detuned driving field of intensity linearly varied in space. The reflection of an incident light from one side of the sample can then be set to vanish over a specific frequency band directly by changing the driving field parameters, such as its intensity and frequency. Also, by incorporating the Bragg scattering into the spatial KK relation, the reflectivity from the opposite side of the sample, though typically small for realistic atomic densities, can be made to increase to improve the reflectivity contrast. The present scheme bears potentials for all-optical network applications that require controllable unidirectional light propagation.

Journal/Review: OPTICS EXPRESS

Volume: 29 (4)      Pages from: 5890  to: 5900

KeyWords: ELECTROMAGNETICALLY INDUCED TRANSPARENCY; BAND-GAPS; INVISIBILITY; SCATTERING; SYMMETRY
DOI: 10.1364/OE.415879

Citations: 15
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