Enhanced sensitivity using rectangular nanohole arrays in metal for biosensing applications

Author

Tellez, Gabriela Andrea Cervantes ; Das, Mandira ; Gordon, Reuven

Author_Institution

Dept. of Electr. & Comput. Eng., Univ. of Victoria, Victoria, BC, Canada

fYear

2011

fDate

15-18 Aug. 2011

Firstpage

126

Lastpage

129

Abstract

We have developed rectangular nanohole arrays in a gold film for enhanced sensitivity in biosensing applications. This paper describes the theory and fabrication of such arrays. Finite difference time domain simulations and experiments are used to determine the bulk sensitivity at 635 nm, and the sensitivity is improved by 14× for simulation and 7× for experiments with respect to circular hole arrays. Arrays with dimensions down to 20 nm are fabricated using focused ion beam milling. A stable vertical setup is built to image these arrays in a low noise environment. The results are encouraging for future biosensing tests.

Keywords

biosensors; finite difference time-domain analysis; focused ion beam technology; milling; nanofabrication; nanosensors; nanostructured materials; Au; biosensing applications; finite difference time domain simulations; focused ion beam milling; gold film; rectangular nanohole arrays; sensitivity; size 20 nm; wavelength 635 nm; Apertures; Metals; Optical sensors; Optical surface waves; Refractive index; Sensitivity; Surface plasmon resonance; biosensors; extraordinary optical transmission;

fLanguage

English

Publisher

ieee

Conference_Titel

Nanotechnology (IEEE-NANO), 2011 11th IEEE Conference on

Conference_Location

Portland, OR

ISSN

1944-9399

Print_ISBN

978-1-4577-1514-3

Electronic_ISBN

1944-9399

Type

conf

DOI

10.1109/NANO.2011.6144363

Filename

6144363