Hypersonic rugate filters based on porous silicon

L Thomas, Gazimagomed N Aliev, Paul A Snow

OAI: oai:purehost.bath.ac.uk:publications/6fa90b15-3d79-4308-b498-fd76cb9d7497 • DOI: https://doi.org/10.1063/1.3506582

Periodic solid state structures exhibit transmission stopbands for waves of certain frequencies. We demonstrate porous silicon based rugate filters with 40 dB rejection first-order stopbands for longitudinal acoustic waves at hypersonic frequencies and the predicted suppression of higher order bands.