Photonic crystal slab Laplace operator for image differentiation
Cheng Guo, Meng Xiao, Momchil Minkov, Yu Shi, Shanhui Fan · Optica · 2018
We introduce an implementation of a Laplace differentiator based on a photonic crystal slab that operates at transmission mode. We show that the Laplace differentiator can be implemented provided that the guided resonances near the $\Gamma$ point exhibit an isotropic band structure. Such a device may facilitate nanophotonics-based optical analog computing for image processing.