Bilaterally asymmetric reflection and transmission of light by a grating structure containing a topological insulator

Enhanced left/right asymmetry in reflection and transmission due to a periodic multilayer of a topological insulator and an anisotropic dielectric material

“…As shown elsewhere [19], consideration of the boundary conditions at the the interface z = ζ n of the TI layer and the CTF yields…”

“…where the 4×4 matrix P subs is obtained by replacing ε TI by ε subs on the right side of eq. (19). The solution of eq.…”

“…Theory shows that left/right reflection asymmetry can be exhibited by a cascade of a layer of an anisotropic dielectric material and a TI layer [19]. If strong enough, left/right reflection asymmetry could enable one-way optical devices that can reduce back-scattering noise as well as instabilities in optical communication networks; help efficiently deliver internet at ultrahigh baud rates through lighting fixtures; and sharpen 2D and 3D images for microscopy, tomography, process control, and surgeries.…”