Surface plasmon enhancement of two- and three-photon absorption of Hoechst 33 258 dye in activated gold colloid solution

    Authors

    I. Cohanoschi;F. E. Hernandez

    Comments

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    Abbreviated Journal Title

    J. Phys. Chem. B

    Keywords

    PHOTODYNAMIC THERAPY AGENTS; RAMAN-SCATTERING; SINGLET OXYGEN; 2ND-HARMONIC GENERATION; FLUORESCENCE MICROSCOPY; OPTICAL-CONSTANTS; PARTICLE-SIZE; NEAR-IR; EXCITATION; NANOPARTICLES; Chemistry, Physical

    Abstract

    Herein we present experimental evidence of the strong surface plasmon enhancement of two-and three-photon absorption of Hoechst 33 258 (2'-(4-hydrophenyl)-5-(4-methyl-1-piperazinyl)-2,5'-bis(1H-benzimidazole)) pentahydrate in an aqueous solution containing activated gold colloid. The 480-fold enhancement in two-photon absorption and 30-fold in three-photon absorption are predominantly attributed to the electricfield enhancement via surface plasmon resonance. The greater enhancement observed in two-photon absorption is due to the characteristic two- and three-photon absorption cross-sections of the dye.

    Journal Title

    Journal of Physical Chemistry B

    Volume

    109

    Issue/Number

    30

    Publication Date

    1-1-2005

    Document Type

    Article

    Language

    English

    First Page

    14506

    Last Page

    14512

    WOS Identifier

    WOS:000230896500040

    ISSN

    1520-6106

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