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Proceedings Article

Experimental measurement of surface plasmon resonance of pyramidal metal nanoparticle tips

[+] Author Affiliations
Yanshu Zou, Kenneth B. Crozier

Harvard School of Engineering and Applied Sciences (USA)

Proc. SPIE 7033, Plasmonics: Nanoimaging, Nanofabrication, and Their Applications IV, 70331X (August 28, 2008); doi:10.1117/12.794740
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From Conference Volume 7033

  • Plasmonics: Nanoimaging, Nanofabrication, and Their Applications IV
  • Satoshi Kawata; Vladimir M. Shalaev; Din Ping Tsai
  • San Diego, California, USA | August 10, 2008

abstract

We report on the fabrication, experimental characterization and modeling of atomic force microscope (AFM) probes with pyramidal optical antennas fabricated at the ends of the tips. These are being developed for tip-enhanced near-field scanning optical microscopy. We use focused ion beam milling to etch a gold-coated Si3N4 AFM tip, resulting in a pyramidal gold nanoparticle (188 - 240 nm long) at the end of the tip. Using finite-difference time-domain (FDTD) simulations, we estimate the electric field distribution around the nanoparticle as a function of incident wavelength for nanoparticles of various lengths. We experimentally measure the scattering spectra of fabricated probes and show enhanced scattering associated with the localized surface plasmon resonance of the tip. Both simulations and experiments show that an increase of the tip length results in a redshift of the tip resonance wavelength. These pyramidal metal nanoparticle tips could be used for either mapping the field distribution of nanophotonic devices or high spatial resolution spectroscopy.

© (2008) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
Citation

Yanshu Zou and Kenneth B. Crozier
"Experimental measurement of surface plasmon resonance of pyramidal metal nanoparticle tips", Proc. SPIE 7033, Plasmonics: Nanoimaging, Nanofabrication, and Their Applications IV, 70331X (August 28, 2008); doi:10.1117/12.794740; http://dx.doi.org/10.1117/12.794740


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