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: Northeast Normal Univ, Sch Phys, Changchun 130024, Peoples R China; Shanxi Univ, State Key Lab Quantum Opt & Quantum Opt Devices, Taiyuan 030006, Peoples R China; Brescia Univ, Dept Engn & Informat Technol, I-25133 Brescia, Italy; Brescia Univ, Ist Nazl Ott INO CNR, I-25133 Brescia, Italy; Scuola Normale Super Pisa, I-56126 Pisa, Italy; CNISM, I-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: 16
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