title: Photonic crystal slab sensor with enhanced surface area.
abstract: In this work, we demonstrate improved molecular detection sensitivity for silicon slab photonic crystal cavities by introducing multiple-hole defects (MHDs), which increase the surface area available for label-free detection without degrading the quality factor. Compared to photonic crystals with L3 defects, adding MHDs into photonic crystal cavities enabled a 44% increase in detection sensitivity towards small refractive index perturbations due to surface monolayer attachment of a small aminosilane molecule. Also, photonic crystals with MHDs exhibited 18% higher detection sensitivity for bulk refractive index changes.
authors.affiliation: Interdisciplinary Graduate Program in Materials Science, Vanderbilt University, Nashville, Tennessee 37235, USA. chris.kang@vanderbilt.edu
authors.forename: Christopher
authors.initials: C
authors.lastname: Kang
authors.forename: Christopher T
authors.initials: CT
authors.lastname: Phare
authors.forename: Yurii A
authors.initials: YA
authors.lastname: Vlasov
authors.forename: Solomon
authors.initials: S
authors.lastname: Assefa
authors.forename: Sharon M
authors.initials: SM
authors.lastname: Weiss
mesh_terms: D004867:Equipment Design; D019544:Equipment Failure Analysis; D017785:Photons; D012031:Refractometry / Q000295:instrumentation*; D012821:Silanes / Q000032:analysis*; D014159:Transducers
chemical_list: D012821:Silanes