Title :
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
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;
Conference_Titel :
Nanotechnology (IEEE-NANO), 2011 11th IEEE Conference on
Conference_Location :
Portland, OR
Print_ISBN :
978-1-4577-1514-3
Electronic_ISBN :
1944-9399
DOI :
10.1109/NANO.2011.6144363
