title: Enhanced detection limit by dark mode perturbation in 2D photonic crystal slab refractive index sensors.
abstract: We demonstrate for the first time a 300nm thick, 300μm × 300μm 2D dielectric photonic crystal slab membrane with a quality factor of 10,600 by coupling light to slightly perturbed dark modes through alternating nano-hole sizes. The newly created fundamental guided resonances greatly reduce nano-fabrication accuracy requirements. Moreover, we created a new layer architecture resulting in electric field enhancement at the interface between the slab and sensing regions, and spectral sensitivity of >800 nm/RIU, that is, >0.8 of the single-mode theoretical upper limit of spectral sensitivity.
authors: Costa
authors: C
authors: Nicolaou
authors: Wah Tung
authors: WT
authors: Lau
authors: Raanan
authors: R
authors: Gad
authors: Hooman
authors: H
authors: Akhavan
authors: Ryan
authors: R
authors: Schilling
authors: Ofer
authors: O
authors: Levi
mesh_terms: D003198:Computer Simulation; D017076:Computer-Aided Design; D004867:Equipment Design; D019544:Equipment Failure Analysis; D008962:Models, Theoretical; D010783:Photometry / Q000295:instrumentation*; D012031:Refractometry / Q000295:instrumentation*; D020349:Surface Plasmon Resonance / Q000295:instrumentation*