Moiré one-dimensional photonic crystal topology composed of holes with different sizes

The characteristics of Moiré one-dimensional photonic crystal (1DPhC) based on topological structure is described. The two 1DPhC lattices with different hole sizes and periods are overlapped to form a 1D Moiré lattice. The filter response of the device changes with the relative position and period difference of two lattices. The resonance mode is excited in two unique positions in the1D Moiré lattice. Higher Q value is attained by smaller period difference and optimized hole size ratio. The Q value can be almost an order higher than the conventional topological 1DPhC resonator. The device shows high sensitivity of 270 nm/RIU against clad refractive index change which may be beneficial to be used as an optical sensor. Sensor sensitivities of 450 to 660 nm/RIU are obtained by using slot waveguide structures.