Figure 4: Structure and band structure of the non-Hermitian straight photonic lattice.
From: Experimental realization of Bloch oscillations in a parity-time synthetic silicon photonic lattice
(a) Schematic of the non-Hermitian photonic lattice consisting of a dissipative PT silicon waveguide array. This non-Hermitian photonic lattice has the exact same geometric design as the Hermitian photonic lattice, except for the additional 100-nm-wide and 4-nm-thick chrome (Cr) layer on top of every other silicon waveguide to introduce periodic optical loss modulation with a filed attenuation coefficient γ=0.00486 μm−1. (b) The band diagram of such non-Hermitian photonic lattice. Blue and red curves represent the real and imaginary parts of the longitudinal propagation constants, respectively. The exceptional singularity points are indicated and highlighted as the black points.
