Complete phononic bandgaps and bandgap maps in two-dimensional silicon phononic crystal plates

摘要

It is shown that it is possible to obtain complete planar phononic bandgaps in square and hexagonal (honeycomb) lattice phononic crystals formed by etching a periodic array of circular holes in a thin silicon plate (or membrane). Also, better bandgap properties are obtained using the hexagonal lattice structure: and, with practical structure sizes, it is possible-to-obtain a gap-to-midgap ratio of 18-35%.