Quantum-sized gold clusters as efficient two-photon absorbers

Guda Ramakrishna, Oleg Varnavski, Junhyung Kim, Dongil Lee, Theodore Goodson

Research output: Contribution to journalArticlepeer-review

312 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)5032-5033
Number of pages2
JournalJournal of the American Chemical Society
Issue number15
Publication statusPublished - 2008 Apr 16

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry


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