Refractive index sensing using quasi one-dimensional nanoslit arrays.
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.
Lee
Min Hyung
MH
Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208-3113, USA.
Gao
Hanwei
H
Odom
Teri W
TW
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
D006046:Gold