High transmitting and coupling characteristics of light at the surface of a photonic crystal with a triangular lattice of air holes

摘要

We investigate and simulate the light transmitting and coupling characteristics of surface mode waveguides (SMWs) based on photonic crystals (PhCs) with a triangular lattice of air holes. We demonstrate that surface waves can be efficiently propagated and served as a new kind of high-efficiency single-SMW-based filter with broad bandwidth in the outer space of PhCs. We also explore the highly efficient coupling of hetero-SMWs constructed by cascading different truncated surfaces. The coupling efficiency is insensitive to the interface position.