Tailored diffraction asymmetries from spatially odd-symmetric phase gratings

Year: 2022

Authors: Hua S., Liu Y.-M., Lio G.E., Zhang X.-J., Wu J.-H., Artoni M., La Rocca G.C.

Autors Affiliation: Center for Quantum Sciences and School of Physics, Northeast Normal University, Changchun 130024, People?s Republic of China; School of Science, Jilin Institute of Chemical Technology, Jilin 132022, People´s Republic of China; Department of Physics and European Laboratory for Nonlinear Spectroscopy (LENS), University of Florence, Sesto Fiorentino, 50019 Florence, Italy; Department of Engineering and Information Technology and Istituto Nazionale di Ottica (INO-CNR), Brescia University, 25133 Brescia, Italy; NEST, Scuola Normale Superiore, 56126 Pisa, Italy

Abstract: Phase gratings, each period of which consists of even numbers of equal-width and equal-thickness elements, can be devised to attain asymmetric diffraction patterns. We show that engineering of offset refractive indices in different elements exhibiting a spatially odd symmetry leads to the elimination of a single diffraction order (directional elimination), while further manipulations on offset refractive indices may lead to the elimination of all odd or even orders (grouped elimination) or all orders but one or two selected (directional selection). These intriguing effects arise from destructive interference between diffracted amplitudes contributed by paired or successive elements, and violation of Friedel?s law in such transparent gratings is an effect of higher order multiple scattering.


Volume: 4 (2)      Pages from: 023113-1  to: 023113-9

More Information: The work is supported by the National Natural Science Foundation of China (Grant No. 12074061) , the Cooperative Program by Italian Ministry of Foreign Affairs and International Cooperation (Grant No. PGR00960) and Na-tional Natural Science Foundation of China (Grant No. 11861131001) , the Funding from Ministry of Science and Technology of China (Grant No. 2021YFE0193500) , and the Joint Laboratories Program of the Italian Research Council (CNR) (Grant. No. SAC.AD002.026 (OMEN) ) . G.E.L. thanks the research project FSE-REACT EU financed by National Social Fund-National Operative Research Program and Inno-vation 2014-2020 (DM 1062/2021) .
DOI: 10.1103/PhysRevResearch.4.023113