Refractive index sensing using quasi one-dimensional nanoslit arrays

Min Hyung Lee; Hanwei Gao; Teri W Odom

doi:10.1021/nl900773m

Refractive index sensing using quasi one-dimensional nanoslit arrays

Nano Lett. 2009 Jul;9(7):2584-8. doi: 10.1021/nl900773m.

Authors

Min Hyung Lee¹, Hanwei Gao, Teri W Odom

Affiliation

¹ Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208-3113, USA.

PMID: 19492843
DOI: 10.1021/nl900773m

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.

Publication types

Research Support, Non-U.S. Gov't
Research Support, U.S. Gov't, Non-P.H.S.

MeSH terms

Glass / chemistry
Gold / chemistry*
Microscopy, Electron, Scanning
Nanotechnology* / methods
Refractometry*
Surface Plasmon Resonance / methods
Surface Properties

Substances

Gold