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. 2011 Jul 18;7(14):2032-6.
doi: 10.1002/smll.201100758. Epub 2011 Jun 9.

Optical properties of tipless gold nanopyramids

Christina M Sweeney  1 , Christopher L Stender, Colleen L Nehl, Warefta Hasan, Kevin L Shuford, Teri W Odom
Affiliations

Optical properties of tipless gold nanopyramids

Christina M Sweeney et al. Small. .
No abstract available

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Figures

Figure 1
Figure 1
Fabrication of TL pyramids. A) Scheme of the modified third step in PEEL, where the e-beam deposition is on a Cr hole array/etched Si template fixed at an angle θ on a rotating stage. B) Scanning electron microscopy (SEM) of θ = 45° TL particles embedded in etched Si pyramidal pits. C) Representative geometries of TL pyramids with base diameter d = 350 nm and calculated particle heights h. D) SEM image of θ = 45° TL pyramids after removal from the Si template.
Figure 2
Figure 2
SEM images of TL particles with different dimensions. A wide range of hole sizes and particles sizes can be accessed by varying the Cr hole size and/or θ. All images are 850 nm × 850 nm.
Figure 3
Figure 3
Comparison of optical properties of TL pyramids with different θ. Single-particle DF spectroscopy of θ = 35°, 45°, 50°, 55° TL pyramids (d = 350 nm) revealed that the λ1- and λ2-resonances blue-shifted as the deposition angle θ increased. Note the λ3-resonance only appears in the θ = 55° TL pyramid. All spectra were taken in n = 1.65 immersion oil on an indium tin oxide (ITO) substrate (n = 1.8). Insets: SEM images of particles from which spectra were taken. All images are 450 nm × 450 nm.
Figure 4
Figure 4
Effect of tip-truncation on RI sensitivity. Single-particle DF spectroscopy of the θ = 35°, 45°, 50°, and 55° TL pyramids in different RI environments (n = 1.550, 1.450, 1.350, 1.293) revealed that the λ1-, λ2-, and λ3-modes red-shifted with increasing n . As expected, the most pronounced shifts occurred in the λ3-resonance of the θ = 55° TL pyramid. Insets: SEM images of particles from which spectra were taken. All images are 450 nm × 450 nm.
Figure 5
Figure 5
Modeling the optical properties of TL pyramids. A) Plasmon hybridization scheme indicating coupling of the same L modes from exterior and interior particle surfaces. B) Scattering spectra of experiment and theory for θ = 35° TL pyramids. The experimental λ1- and λ2-resonances can be associated with the calculated λ4b bonding and λ3a antibonding plasmonic modes, respectively. C) Vector plots of the induced polarizations for a pyramidal shell nanoparticle (d = 350 nm, tapered shell thickness). The positive and negative charge distributions are highlighted for clarity.
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