FDTD analysis of structured metallic nanohole films for LSPR-based biosensor

Author

Fairus Atida Said;P. Susthitha Menon;T. Kalaivani;Mohd Ambri Mohamed;Alam Abedini;Sahbudin Shaari;Burhanuddin Yeop Majlis;V. Retnasamy

Author_Institution

Institute of Microengineering and Nanoelectronics (IMEN), Universiti Kebangsaan Malaysia (UKM), 43600 UKM Bangi, Selangor, Malaysia

fYear

2015

Firstpage

1

Lastpage

4

Abstract

We numerically investigated 3-dimensional (3D) sub-wavelength structured metallic nanohole films with various thicknesses using wavelength interrogation technique. The reflectivity and full-width at half maximum (FWHM) of the localized surface plasmon resonance (LSPR) spectra was calculated using finite-difference time domain (FDTD) method. Results showed that a 100nm-thick silver nanohole gave higher reflectivity of 92% at the resonance wavelength of 644nm. Silver, copper and aluminum structured thin films showed only a small difference in the reflectivity spectra for various metallic film thicknesses whereas gold thin films showed a reflectivity decrease as the film thickness was increased. However, all four types of metallic nanohole films exhibited increment in FWHM (broader curve) and the resonance wavelength was red-shifted as the film thicknesses were decreased.

Keywords

"Films","Reflectivity","Gold","Plasmons","Optical surface waves","Finite difference methods","Time-domain analysis"

Publisher

ieee

Conference_Titel

Micro and Nanoelectronics (RSM), 2015 IEEE Regional Symposium on

Type

conf

DOI

10.1109/RSM.2015.7355024

Filename

7355024