Waveguides and waveguide bends in two-dimensional photonic crystal slabs

TLDR

The study theoretically investigates waveguides and bends in two‑dimensional photonic crystal slabs, targeting nonleaky frequency ranges. Waveguides are formed by adjusting air‑hole sizes, with designs applied to both triangular and square lattice slabs to operate in nonleaky bands. High‑transmission sharp bends are achieved in triangular lattice slabs over specific frequency ranges.

Abstract

We present theoretical studies on waveguides and waveguide bends in two-dimensional photonic crystal slabs. The waveguides are created by either filling up or decreasing the sizes of air holes. Our designs focus on using the frequency range where the waveguide mode is nonleaky. It is shown that high transmission through the sharp bend can be obtained for some frequency ranges in the triangular lattice slabs. The waveguides in square lattice slabs are also investigated.