Localized surface plasmon

A Localized Surface Plasmon (LSP) is the result of the confinement of a surface plasmon in a nanoparticle of size comparable to or smaller than the wavelength of light used to excite the plasmon. The LSP has two important effects:

  1. Electric fields near the particle’s surface are greatly enhanced. This enhancement falls off quickly with distance from the surface.
  2. The particle’s optical absorption has a maximum at the plasmon resonant frequency. For noble metal nanoparticles, this occurs at visible wavelengths.[1] For semiconductor nanoparticles, the maximum optical absorption is often in the near-infrared and mid-infrared region.[2][3]

Please also refer to the article Surface plasmon resonance, which includes discussion on the localized surface plasmon resonance.

LSP Applications

The plasmon resonant frequency is highly sensitive to the refractive index of the environment; a change in refractive index results in a shift in the resonant frequency. As the resonant frequency is easy to measure, this allows LSP nanoparticles to be used for nanoscale sensing applications.[4] Nanostructures exhibiting LSP resonances are used to enhance signals in modern analytical techniques based on spectroscopy.

References

  1. ↑ Matthew Rycenga, Claire M. Cobley, Jie Zeng, Weiyang Li, Christine H. Moran, Qiang Zhang, Dong Qin, and Younan Xia. (2011) "Controlling the Synthesis and Assembly of Silver Nanostructures for Plasmonic Applications". Chem. Rev. 111, 3669–3712.
  2. ↑ Xin Liu and Mark T. Swihart. (2014) "Heavily-doped colloidal semiconductor and metal oxide nanocrystals: an emerging new class of plasmonic nanomaterials". Chem. Soc. Rev. 43, 3908--3920. http://dx.doi.org/10.1039/c3cs60417a
  3. ↑ Shu Zhou, Xiaodong Pi, Zhenyi Ni, Yi Ding, Yingying Jiang, Chuanhong Jin, Christophe Delerue, Deren Yang, and Tomohiro Nozaki. (2015) "Comparative study on the localized surface plasmon resonance of boron- and phosphorus-doped silicon nanocrystals". ACS Nano 9, 378–386. http://dx.doi.org/10.1021/nn505416r
  4. ↑ Mayer, Kathryn M.; Hafner, Jason H. (2011). "Localized Surface Plasmon Resonance Sensors". Chemical Reviews. Plasmonics (111): 3828–3857. doi:10.1021/cr100313v.


This article is issued from Wikipedia - version of the Sunday, September 27, 2015. The text is available under the Creative Commons Attribution/Share Alike but additional terms may apply for the media files.