Post-fabrication Voltage Controlled Resonance Tuning of Nanoscale Plasmonic Antennas

    Authors

    C. Lumdee; S. Toroghi;P. G. Kik

    Comments

    Authors: contact us about adding a copy of your work at STARS@ucf.edu

    Abbreviated Journal Title

    ACS Nano

    Keywords

    plasmon resonance tuning; anodization; image dipole; gold nanoparticle; aluminum; single particle spectroscopy; ENHANCED RAMAN-SCATTERING; NANOPARTICLE ARRAYS; OPTICAL-ABSORPTION; EXCITATION SPECTROSCOPY; SILVER NANOPARTICLES; GOLD NANOPARTICLES; SURFACE; ALUMINUM; SUBSTRATE; DIPOLE; Chemistry, Multidisciplinary; Chemistry, Physical; Nanoscience &; Nanotechnology; Materials Science, Multidisciplinary

    Abstract

    Voltage controlled wavelength tuning of the localized surface plasmon resonance of gold nanoparticles on an aluminum film is demonstrated in single particle microscopy and spectroscopy measurements. Anodization of the Al film after nanoparticle deposition forms an aluminum oxide spacer layer between the gold particles and the Al film, modifying the particle substrate interaction. Darkfield microscopy reveals ring-shaped scattering images from individual Au nanoparticles, indicative of plasmon resonances with a dipole moment normal to the substrate. Single particle scattering spectra show narrow plasmon resonances that can be tuned from similar to 580 to similar to 550 nm as the anodization voltage increases to 12 V. All observed experimental trends could be reproduced in numerical simulations. The presented approach could be used as a general postfabrication resonance optimization step of plasmonic nanoantennas and devices.

    Journal Title

    Acs Nano

    Volume

    6

    Issue/Number

    7

    Publication Date

    1-1-2012

    Document Type

    Article

    Language

    English

    First Page

    6301

    Last Page

    6307

    WOS Identifier

    WOS:000306673800062

    ISSN

    1936-0851

    Share

    COinS