Near-field optical spectroscopy of individual surface-plasmon modes in colloid clusters

Content Provider	Semantic Scholar
Author	Markel, Vadim A. Huynh, William Haslett, T. L. Moskovits, Martin
Copyright Year	1999
Abstract	Local spectra of self-affine clusters of silver colloid particles recorded with subwavelength resolution by near-field spectroscopy are reported. Spectra were also simulated computationally. The observed and calculated near-field spectra consist of several resonances with highly location-dependent frequencies. The most highly resolved of these resonances correspond to individual surface plasmon ~SP! normal modes. All of these features are only observable in the near field. Both theory and experiment also show that when excited by light in the SP region of the spectrum, the field-intensity distribution in the near field is very heterogeneous with most of the excitation concentrated in ‘‘hot spots’’ on the cluster surface that are strongly excitationwavelength dependent. This field-intensity localization provides a rationale for recently reported surfaceenhanced Raman enhancements in excess of 10 . @S0163-1829 ~99!01115-7#
File Format	PDF HTM / HTML
Alternate Webpage(s)	https://www.cbica.upenn.edu/vmarkel/EPUBS/PRB10903.pdf
Alternate Webpage(s)	http://whale.seas.upenn.edu/vmarkel/EPUBS/PRB10903.pdf
Language	English
Access Restriction	Open
Subject Keyword	Colloids Concentrate Dosage Form Design rationale Exanthema Excitation Near field communication Normal mode Observable Offset binary Optical Spectroscopy Plasmon RCA Spectra 70 Raman scattering Silver
Content Type	Text
Resource Type	Article