Title

Effect of the concentration of organic dyes on their surface plasmon enhanced two-photon absorption cross section using activated Au nanoparticles

Authors

Authors

I. Cohanoschi; S. Yao; K. D. Belfield;F. E. Hernandez

Comments

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Abbreviated Journal Title

J. Appl. Phys.

Keywords

PHOTODYNAMIC THERAPY AGENTS; SINGLET OXYGEN; 2ND-HARMONIC GENERATION; FLUORESCENCE MICROSCOPY; RAMAN-SCATTERING; EXCITATION; MOLECULES; Physics, Applied

Abstract

In this article we present the study of the surface plasmon enhanced two-photon absorption of a hydrophilic stilbene derivative (trans-4,4'-diaminostilbene) in aqueous solution at different concentrations. The observed exponential growth of the effective two-photon absorption cross section [sigma(')(2)(Au)] is attributed to the electric-field augmentation via surface plasmon resonance between nanoparticles, i.e., hot spots, and the molecular density on Au nanospheres. An unprecedented sigma(')(2)(Au)=550 000 GM has been measured. This result opens a new universe of applications in multiphoton imaging, photodynamic therapy, telecommunications, optical limiting, and multidimensional data storage using hybrid systems. (c) 2007 American Institute of Physics.

Journal Title

Journal of Applied Physics

Volume

101

Issue/Number

8

Publication Date

1-1-2007

Document Type

Article

Language

English

First Page

3

WOS Identifier

WOS:000246072200180

ISSN

0021-8979

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