Electromagnetically induced polarization grating

Abstract

Based on electromagnetically induced transparency (EIT), we investigate an all-optical grating structure to realize polarization-dependent multiple beam splitting in the Raman-Nath limit. To optimize the grating performance, higher excited state [e.g., nS1/2 (n ≥ 6)] of ultracold 87Rb atoms is employed to construct a five-level Ξ-Λ system sharing one common populated ground state. A principal advantage of our proposed scheme is that the σ± components of a linearly polarized weak probe field can be decoupled and thus be independently diffracted with high efficiency in both one and two dimensions by exploiting different quasi-standing waves as the two strong coupling fields in the Ξ and Λ configurations. Such an all-optical polarization-sensitive operation could greatly enhance the tunability and capacity of all-optical multiplexing, interconnecting, and networking in free space for both classical and quantum applications.

Multi-wave-mixing-induced nonlinear modulation of diffraction peaks in an opto-atomic grating

“…More specifically, EIG in terms of spatially modulated EIT or DEIT has been analyzed in Refs. 4 – 8 , 13 , 14 , 18 , 20 , 22 – 25 and EIG based on EIA has been explained in Ref. 5 , 17 .…”

Electromagnetically induced moiré optical lattices in a coherent atomic gas

“…Of particular interest in the optics and photonic communities are the two fabricated methods, direct femtosecond-laser writing technique and optically induced ones, with the former being widely used in solid materials where the induced photonic lattices have a permanent refractive index (and the optical and thermal stability of the laser machining method should be carefully processed) and the latter applies both to solid materials and gaseous media. The periodic structures manufactured by the latter method are aliased as electromagnetically induced gratings (EIGs), which are being extensively studied from both theoretical and experimental sides [12][13][14][15][16][17][18][19][20][21][22][23] in recent years, owning to the highly tunable degree of freedom of the induced periodic structures enabled by external and real-time changeable environments for both hot atomic vapours under room temperature and ultracold atoms (like Bose-Einstein condensates) in the nano-Kevin regime.…”

One- and two-dimensional Raman-induced diffraction gratings in atomic media

“…Therefore, seeking new approaches to improve the efficiency of higher diffraction orders is of undoubted interest. In a recent paper [26], the author proposed 1D and 2D electromagnetically induced polarization diffraction grating based on EIT for realization polarization-dependent multiple beam splitting in the Raman-Nath limit. An electromagnetically induced phase diffraction grating controlled by spontaneous generated coherence (SGC) in atomic systems is studied in [27,28] The possibility of significant improvement of the intensity of higher-order diffractions via relative phase between applied laser fields due to the existence of SGC is shown.…”