Nano Archive

Long-range refractive index sensing using plasmonic nanostructures

Rindzevicius, Tomas and Alaverdyan, Yury and Kall, Mikael and Murray, W. Andrew and Barnes, William L. (2007) Long-range refractive index sensing using plasmonic nanostructures. JOURNAL OF PHYSICAL CHEMISTRY C, 111 (32). pp. 11806-11810.

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We study the variation in localized surface plasmon resonance (LSPR) spectra (λLSPR ≈ 600 nm) as a function of dielectric coating thickness. Langmuir−Blodgett multilayers composed of 22-tricosenoic acid (n ≈ 1.53) were deposited onto short-range-ordered Au nanodisks and nanoholes on glass in air. For large dielectric coating thicknesses (d = 100−340 nm), the LSPRs exhibit a pronounced oscillatory behavior with a periodicity of 190 nm. This is in agreement with a simple image-dipole model, which yields a periodicity of λLSPR/2n. However, the amplitude of the dipolar plasmon resonance wavelength oscillation λLSPR(d) is surprisingly large, of the order 25−45 nm for d ≈ 300 nm, indicating the importance of finite size effects. The large LSPR shifts observed at such a large distance from the actual metal surface suggest the possibility of using comparatively thick dielectric films as spacer layers in bio/chemo LSPR sensor applications.

Item Type:Article
Subjects:Analytical Science > Nanotechnology for sensing and actuating
Physical Science > Nano objects
Material Science > Nanostructured materials
ID Code:2285
Deposited By:Anuj Seth
Deposited On:28 May 2009 13:33
Last Modified:28 May 2009 13:33

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