Partially coherent beam generation with metasurfaces
An optical system for the generation of partially coherent beams with genuine cross-spectral density functions from spatially modulated globally incoherent sources is presented. The spatial intensity modulation of the incoherent source is achieved by quasi-planar metasurfaces based on spatial-frequency modulation of binary Bragg surface-relief diffraction gratings. Two types of beams are demonstrated experimentally: (i) azimuthally periodic, radially quasi-periodic beams and (ii) rotationally symmetric Bessel-correlated beams with annular far-zone radiation patterns.
Roman Calpe, Atri Halder, Meilan Luo, Matias Koivurova, Jari Turunen. Partially coherent beam generation with metasurfaces[J]. Photonics Research, 2023, 11(9): 1535.