Dual-band asymmetric optical transmission of both linearly and circularly polarized waves using bilayer coupled complementary chiral metasurface

High-Performance Asymmetric Optical Transmission Based on a Dielectric–Metal Metasurface

“…Fortunately, the emergence of metamaterial provides an appealing alternative to control electromagnetic wave manipulations properties [12][13][14][15][16][17], and the discovery of the AT phenomenon based on metamaterial was first experimentally demonstrated in the microwave region by Fedotov et al in 2006 [18]. Since then, various AT devices based on artificial structures have been proposed which use photonic crystals [19,20], subwavelength asymmetric gratings [21][22][23][24], chiral metamaterials [25][26][27] and metasurfaces [28][29][30], and the operation wavelengths have been covered from microwave to visible light [31][32][33]. These devices show promise to some degree; however, those using chiral metamaterials are usually complex and incorporate multilayer structures, whereas those using subwavelength asymmetric gratings are polarization sensitive.…”

Dielectric Chiral Metasurfaces for Second‐Harmonic Generation with Strong Circular Dichroism

“…Chiral metamaterials and metasurfaces [1][2][3][4][5] have recently attracted much attention in the community of nanophotonics due to their practical applications for circular dichroism (CD), [6][7][8][9][10][11] polarization conversion, [12] chiral biosensing and imaging, [13][14][15] polarimetric detection, [16] spin-controlled wavefront shaping, [17,18] and asymmetric transmission. [10,18,19] Spin-selective optical responses can also be obtained in intrinsically achiral metasurfaces due to extrinsic chirality by the experimental arrangement different from their mirror image [20] and even by the direct phase modulation depending on the handedness of circular polarization of the incident wave. [21] The above metamaterials and metasurfaces can be made of both plasmonic and dielectric materials, the latter of which are preferable due to lower optical losses and stronger CD.…”

All-dielectric bilayer complementary metasurfaces supporting quasi-bound states in the continuum induced by intrinsically broken out-of-plane symmetry

“…Recently, bilayer complementary hybrid metasurfaces have been proposed for coloration, 42 efficient manipulation of visible light, 43 and asymmetric transmission in linear 44 and nonlinear regimes, 45 while they suffer from strong optical losses due to the existence of plasmonic layers. In this work, we consider all-dielectric metasurfaces with bilayer complementary structures, which can be fabricated by simply depositing a high-index dielectric (silicon) layer on the metasurface made of a low-index material (silica).…”