Polarization-independent asymmetric light transmission in all-dielectric photonic structures

Investigations on asymmetric transmittivity of optical devices and different diode-like behaviors

“…The AT achieved by reciprocal optical devices is diffractive AT in general. 5 Such kinds of reciprocal optical devices take various forms, one main group is diffraction gratings, which can be classified into gratings with tapered structures 14 , 15 , 16 , 17 , 18 , 19 or corrugated surfaces, 20 gratings with a subwavelength slit, 21 , 22 , 23 dual or double gratings, 24 , 25 , 26 photonic crystal gratings with corrugated surfaces 27 , 28 , 29 , 30 or with other asymmetric structures, 31 , 32 and some other special gratings. 33 , 34 Other forms include multilayer crystals containing defects, 35 , 36 , 37 metasurfaces, 38 , 39 and photonic crystals.…”