Surface Plasmon Photonics
-18 %

Surface Plasmon Photonics

From Optical Properties of Nanoparticles to Single Molecule Surface-enhanced Raman Scattering
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ISBN-13:
9783639023756
Einband:
Paperback
Seiten:
116
Autor:
Hongxing Xu
Gewicht:
192 g
Format:
219x149x18 mm
Sprache:
Englisch
Beschreibung:

This thesis deals with the optical properties of Localized surface plasmon resonances (SPR) determine
the main optical properties of Ag and Au
nanoparticles in the visible. Under certain
conditions, SPR can give rise to single molecule
sensitivity in surface-enhanced Raman scattering
(SERS). The experimental observation of dimer
structures, where two Ag particles are bridged by a
single hemoglobin molecule, probably reveal the
simplest nanoparticle system that can amplify Raman
scattering to the extent that vibrational spectra of
single molecules can be recorded. More controllable
interparticle coupling effects are observed for
nanofabricated Ag particles on Si.
The generalized Mie theory (GMT) has been used to
analyze the mechanisms of single molecule SERS,
which indicates that the electromagnetic enhancement
mechanism is the main contributor to SERS. GMT is
also used to theoretically quantify optical forces
associated with Ag nanoparticles. The results
indicate that molecules can be trapped and particle
aggregates deformed by the optical forces induced at
SPR excitation.