Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.3/193377

Title

Spectral sensitivity of uniform arrays of gold nanorods to dielectric environment

Author(s)

Ueno, Kosei;  Juodkazis, Saulius;  Mino, Masahiro;  Mizeikis, Vygantas;  Misawa, Hiroaki

Abstract

Uniform, ordered arrays of gold nanorods on glass substrates were fabricated with high accuracy using electron beam lithography and lift-off techniques. These structures exhibit longitudinal mode of localized surface plasmon (LSP) resonance with spectral position highly sensitive to the refractive index of local dielectric environment of the nanorods. The LSP resonance was found to red-shift nearly linearly, both with refractive index and aspect ratio of the nanorods, to the extent that enables optical detection of the refractive index changes of the order of 10 -2. The entire spectral range of the detection can be defined by tailoring size and aspect ratio of the nanorods during the fabrication and typically falls into the optical communications region. These structures are therefore promising as optical sensors enabling simple and efficient monitoring of chemical and biological processes.

Publication type

Journal article

Source

Journal of Physical Chemistry C, Vol. 111, no. 11 (Mar 2007), pp. 4180-4184

Publication year

2007

FOR Code(s)

0303 Macromolecular and Materials Chemistry;  0306 Physical Chemistry (Incl. Structural);  0904 Chemical Engineering

Keyword(s)

Dielectric properties;  Electron beam lithography;  Gold nanorods;  Sensitivity;  Surface plasmon resonance

Publisher

American Chemical Society

ISSN

1932-7447

Publisher URL

http://dx.doi.org/10.1021/jp068243m

Copyright

Copyright © 2007 American Chemical Society.

Additional information

The authors acknowledge support from a Grant-in-Aids from the Ministry of Education, Science, Sports, and Culture, Japan (No. 17360110).

Peer reviewed