Band Gaps and Waveguiding in Phoxonic Silicon Crystal Slabs

Abstract

[EN] We discuss the simultaneous existence of phoxonic, i.e., phononic and photonic, band gaps in a periodic array of holes drilled in a Si membrane. We investigate in detail both the square and the honeycomb lattices. We show that complete phoxonic band gaps can be obtained with the honeycomb lattice. Otherwise, both structures present the possibility of a complete phononic gap together with a photonic band gap of a given symmetry, odd or even, depending on the geometrical parameters. We show the possibility of confinement of both acoustic and optical waves in a waveguide created inside the honeycomb structure.