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| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | Govorov, A. |
| Copyright Year | 2011 |
| Description | Author affiliation: Dept. of Phys. & Astron., Ohio Univ., Athens, OH, USA (Govorov, A.) |
| Abstract | Coulomb and electromagnetic interactions between excitons and plasmons in nanocrystals cause several prominent effects: Energy transfer between nanoparticles, plasmon enhancement, exciton energy shifts, Fano interference and non-linear effects, and new mechanisms of optical chirality. An interaction between a discrete state of exciton and a continuum of plasmonic states gives rise to interference effects (Fano-like asymmetric resonances and anti-resonances). These interference effects greatly enhance a visibility of relatively weak exciton signals and can be used for spectroscopy of single nanoparticles and molecules. If a system includes chiral elements (chiral molecules or nanocrystals), the exciton-plasmon interaction is able to dramatically change the circular dichroism (CD) of chiral elements. In particular, the exciton-plasmon interaction may create new chiral plasmonic lines in the CD spectra of a molecule-nanocrystal complex. Two mechanisms, in which a plasmonic nanocrystal can influence the CD effect of a chiral molecule, have been identified. The first mechanism is the plasmon-induced change in the electromagnetic field inside the chiral molecule (or chiral semiconductor nanocrystal). The second is the optical absorption of the exciton-plasmon system due to the chiral dissipative currents inside the metal nanocrystal. Strong CD signals may also appear in purely plasmonic systems with a chiral geometry and a strong particle-particle interaction. Recent experiments on the protein-nanocrystal complexes demonstrated an appearance of new chiral plasmonic lines in the CD spectra. |
| Sponsorship | Photonics Soc. |
| Starting Page | 789 |
| Ending Page | 790 |
| File Size | 119863 |
| Page Count | 2 |
| File Format | |
| ISBN | 9781424489404 |
| e-ISBN | 9781424489398 |
| DOI | 10.1109/PHO.2011.6110792 |
| Language | English |
| Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Publisher Date | 2011-10-09 |
| Publisher Place | USA |
| Access Restriction | Subscribed |
| Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Subject Keyword | Plasmons Nanocrystals Excitons Interference Nonlinear optics Energy exchange |
| Content Type | Text |
| Resource Type | Article |
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