Quantum-sized Gold Clusters As Efficient Two-photon Absorbers

Overview

Journal J Am Chem Soc

Publisher American Chemical Society

Specialty Chemistry

Date 2008 Mar 25

PMID 18357982

Citations 28

Authors

Guda Ramakrishna

Oleg Varnavski

Junhyung Kim

Dongil Lee

Theodore Goodson

Affiliations

Soon will be listed here.

Abstract

The two-photon absorption properties of Au25 cluster has been investigated with the aid of two-photon excited fluorescence in the communication wavelength region with a cross-section of 2700 GM at 1290 nm. Additional visible fluorescence has been discovered for small gold clusters which is two-photon allowed (after excitation at 800 nm), and the absolute cross-section has been determined for gold clusters with number of gold atoms varying from 25 to all the way up to 2406 using one and two-photon excited time-resolved fluorescence upconversion measurements. Record high TPA cross-sections have been measured for quantum sized clusters making them suitable for two-photon imaging as well as other applications such as optical power limiting and lithography.

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