A very wide stopband (≈300nm) optical filter based on a photonic crystal vertical directional coupler

Abstract

b) Figure 1. (a): Schematic of the vertical directional coupler; (b) 3-D calculated band structure: silica lightline (dashed line), polymer waveguide (blue line), W1 PhC waveguide (red line), odd defect mode (dotted line); inset: anticrossing point (enlarged). Abstract-We present a new vertical directional coupler basedon the coupling between a polymer waveguide and a photonic crystal waveguide with a very wide stopband.