Direct Visualization of Wavelength-Dependent Single Dipoles Generated on Single Gold Nanourchins with Sharp Branches

Nanoscale Research Letters
Geun Wan Kim, Ji Won Ha

Abstract

We present the optical properties of singe gold nanourchins (AuNUs) with sharp branches on their surfaces under dark-field (DF) microscopy and spectroscopy. The DF intensities of the single AuNUs were changed periodically as a function of the rotation angle at three localized surface plasmon resonance (LSPR) wavelengths. Furthermore, we demonstrate the generation of single dipoles with different LSPR wavelengths in multiple directions on the same AuNU surface. The multiple LSPR dipoles generated on the AuNU surface were further visualized under defocused DF microscopy and verified by characteristic doughnut-shaped defocused scattering field distributions. ᅟ.

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Citations

Apr 5, 2019·Photochemical & Photobiological Sciences : Official Journal of the European Photochemistry Association and the European Society for Photobiology·Geun Wan Kim, Ji Won Ha

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Methods Mentioned

BETA
surface plasmon resonance
biosensors
Particle
scanning electron microscopy
single particle microscopy
single-particle scattering

Software Mentioned

MATLAB

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