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Why Does the Spectrum of Localized Surface Plasmons Shifts From Near-Field to Far-Field, and Viceversa?

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Abstract

Plasmonics is a main branch of Nanophotonics. Two important physical effects are observed in connection with particle surface plasmons: localization of the incident electromagnetic energy within dimensions much smaller than the incident wavelength being converted into electromechanical energy; and a strong enhancement of the electromagnetic field intensity in the proximities of the nanostructure. This opened many applications in areas such as those related to health, communications, information storage, enhanced spectroscopy, particle manipulation, etc. In those techniques a good understanding and control of such enhancements is important. This is the case of applications like surface-enhanced Raman spectroscopy (SERS) and all related procedures. In this regard, continuous advances controlling such interactions at the naoscale are essential to improve and accurately apply all spectroscopy techniques developed around plasmonics.

© 2014 Optical Society of America

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