Controlled unidirectional reflection in cold atoms via the spatial Kramers-Kronig relation
Autor: | Yan Zhang, G. C. La Rocca, Maurizio Artoni, Jin-Hui Wu |
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Přispěvatelé: | Zhang, Y., Wu, J. -H., Artoni, M., la Rocca, G. C. |
Jazyk: | angličtina |
Rok vydání: | 2021 |
Předmět: |
Physics
Kramers–Kronig relations business.industry Frequency band Bragg's law 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Ray Atomic and Molecular Physics and Optics Computational physics Settore FIS/03 - Fisica della Materia 010309 optics Reflection (mathematics) Optics Frequency domain 0103 physical sciences Light beam 0210 nano-technology business Refractive index |
Popis: | 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)10.1038/nphoton.2015.106]. 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. |
Databáze: | OpenAIRE |
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