Smith, Cameron L.C.Wu, Darran K.C.Lee, Michael W.Monat, ChristelleTomljenovic-Hanic, SnjezanaFreeman, DarrenMadden, SteveGrillet, ChristianLuther-Davies, BarryGiessen, HaraldEggleton, Benjamin J.2025-12-312025-12-3197808194697170277-786XORCID:/0000-0002-2747-5036/work/161269327ORCID:/0000-0003-3146-285X/work/162865904https://hdl.handle.net/1885/733797480We demonstrate post-processed and reconfigurable photonic crystal double-heterostructure nanocavities via selective fluid infiltration. We experimentally investigate the microfluidic structures via evanescent probing from a tapered fiber at telecommunications wavelengths. We demonstrate a cavity with quality factor Q = 4,300. The defect-writing technique we present does not require nanometer-scale alterations in lattice geometry and may be undertaken at any time after photonic crystal waveguide fabrication.enDouble-heterostructureMicrofluidicNanocavityPhotonic crystal200810.1117/12.76508941149174907