Long-range refractive index sensing using plasmonic nanostructures

被引:75
作者
Rindzevicius, Tomas
Alaverdyan, Yury
Kall, Mikael [1 ]
Murray, W. Andrew
Barnes, William L.
机构
[1] Chalmers, Dept Appl Phys, SE-41296 Gothenburg, Sweden
[2] Univ Exeter, Sch Phys, Exeter EX4 4QL, Devon, England
关键词
D O I
10.1021/jp072564w
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
We study the variation in localized surface plasmon resonance (LSPR) spectra (lambda(LSPR) approximate to 600 nm) as a function of dielectric coating thickness. Langmuir-Blodgett multilayers composed of 22-tricosenoic acid (n approximate to 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 similar to 190 nm. This is in agreement with a simple image-dipole model, which yields a periodicity of similar to lambda(LSPR)/2n. However, the amplitude of the dipolar plasmon resonance wavelength oscillation lambda(LSPR)(d) is surprisingly large, of the order 25-45 nm for d approximate to 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.
引用
收藏
页码:11806 / 11810
页数:5
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