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Photonics and Nanostructures - Fundamentals and Applications

Tunable polarization-selective diffraction from plasmon-modified electromagnetically induced gratings in a double V-type configuration

Suleiman Ibrahim Mohammad, Mehulkumar B. Patel, Asokan Vasudevan, Malatesh S. Akkur, Basem Abu Zneid, Geetha Subramaniam, Nilufar Rajabova, Reya Sharma, Sanjeev Kumar, Ali Khalaf

Published May 1, 2026• 0 citations
Publisher
DOI
10.1016/j.photonics.2026.101613

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We introduce here double electromagnetically induced grating (DEIG) using a tripod atomic structure, wherein two probe and signal fields with different frequencies simultaneously experience an atomic grating. Properties of presented DEIG can be substantially modified by the detuning of the applied fields. It has also been found that applying an incoherent pump field has a remarkable influence on the high-order diffraction efficiencies. Amplification of travelling weak lights via the incoherent pump field results in large diffraction efficiencies in the first-order and second-order directions. Such a novel scheme might open up the possibility for designing a two-qubit switch that would be advantageous to quantum information processing and quantum networking.
configuration coherent rubidium thermal vapor. This new energy level structure employs a Rydberg level as the uppermost level and contains two typical electromagnetically induced transparency energy level configurations with the same probe field. Compared with the traditional V-type three-level grating, a significant improvement of the diffraction efficiency of this novel grating was observed. Its improvement was then also demonstrated experimentally by the transition spectrum and theoretically by a comprehensive simulation. The diffraction efficiency gain introduced by the control laser field was tuned with several experimental parameters, such as the atomic density and the control field intensity. And the maximum enhancement rate of first-order diffraction efficiency is proved to be as high as 30%. Such a novel all-optical tunable grating promises to be the new driving force in the advancement of all-optical communications and information technology.