title: λ³/1000 plasmonic nanocavities for biosensing fabricated by soft UV nanoimprint lithography.
abstract: Arrays of plasmonic nanocavities with very low volumes, down to λ(3)/1000, have been fabricated by soft UV nanoimprint lithography. Nearly perfect omnidirectional absorption (3-70°) is demonstrated for the fundamental mode of the cavity (λ ≃ 1.15 μm). The second-order mode exhibits a sharper resonance with strong angular dependence and total optical absorption when the critical coupling condition is fulfilled (45-50°, λ ≃ 750 nm). It leads to high refractive index sensitivity (405 nm/RIU) and figure of merit (∼21) and offers new perspectives for efficient biosensing experiments in ultralow volumes.
authors.affiliation: Laboratoire de Photonique et de Nanostructures (LPN-CNRS) Route de Nozay, 91460 Marcoussis, France. andrea.cattoni@lpn.cnrs.fr
authors.forename: Andrea
authors.initials: A
authors.lastname: Cattoni
authors.forename: Petru
authors.initials: P
authors.lastname: Ghenuche
authors.forename: Anne-Marie
authors.initials: AM
authors.lastname: Haghiri-Gosnet
authors.forename: Dominique
authors.initials: D
authors.lastname: Decanini
authors.forename: Jing
authors.initials: J
authors.lastname: Chen
authors.forename: Jean-Luc
authors.initials: JL
authors.lastname: Pelouard
authors.forename: Stéphane
authors.initials: S
authors.lastname: Collin
mesh_terms: D000042:Absorption; D015374:Biosensing Techniques; D001709:Biotechnology / Q000379:methods; D004867:Equipment Design; D049329:Nanostructures / Q000737:chemistry; D036103:Nanotechnology / Q000379:methods*; D055095:Optics and Photonics; D012031:Refractometry; D012666:Semiconductors; D020349:Surface Plasmon Resonance / Q000379:methods; D014466:Ultraviolet Rays