title: Refractive index sensing using quasi one-dimensional nanoslit arrays.
abstract: This letter describes the optical properties of quasi one-dimensional (1D) Au nanoslit arrays on a microscale pitch. The transmission spectra exhibited multiple minima that were well characterized by 1D surface plasmon polariton Bloch wave modes. We found that all higher order modes showed a linear response to small changes of refractive index (RI) with sensitivities up to 560 nm per RI unit, which is comparable to that of two-dimensional nanohole arrays. By calibrating the RI response of the nanoslit arrays, we could use the multiple modes to determine the RI of unknown, nonabsorbing solutions.
authors.affiliation: Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208-3113, USA.
authors.forename: Min Hyung
authors.initials: MH
authors.lastname: Lee
authors.forename: Hanwei
authors.initials: H
authors.lastname: Gao
authors.forename: Teri W
authors.initials: TW
authors.lastname: Odom
mesh_terms: D005898:Glass / Q000737:chemistry; D006046:Gold / Q000737:chemistry*; D008855:Microscopy, Electron, Scanning; D036103:Nanotechnology / Q000379:methods; D012031:Refractometry; D020349:Surface Plasmon Resonance / Q000379:methods; D013499:Surface Properties
chemical_list: D006046:Gold