PT Journal AU Pruessner, MW Stievater, TH Rabinovich, WS TI Integrated waveguide Fabry-Perot microcavities with silicon/air Bragg mirrors SO Optics Letters JI Opt. Lett. PY 2007 BP 533 VL 32 IS 5 DI 10.1364/OL.32.000533 ER