Search Menu
Photonics Media Photonics Buyers' Guide Photonics EDU Photonics Spectra BioPhotonics EuroPhotonics Industrial Photonics Photonics Showcase Photonics ProdSpec Photonics Handbook
More News
Email Facebook Twitter Google+ LinkedIn Comments

  • Tunneling Electrons Stimulate Individual Molecules

Photonics Spectra
Mar 2003
Using a scanning tunneling microscope, a research team at the University of California, Irvine, has induced photoemission in individual porphyrin molecules on an aluminum oxide film, yielding fluorescence patterns that depend on the molecular conformations. The technique, which was reported in the Jan. 24 issue of Science, may find applications in the study of electron dynamics in conjugated polymers and organic molecules and of the influence of local plasmon modes on intermolecular fluorescence resonance energy transfer.

In the experiments, the researchers employed a homebuilt ultrahigh-vacuum scanning tunneling microscope with silver or tungsten tips. They found that the silver tips enabled higher photon emission efficiencies and revealed greater details in the resulting emission spectra and intensities. Sample bias voltages were 2 to 2.4 V, and the tunneling current was 0.5 nA.

Terms & Conditions Privacy Policy About Us Contact Us
back to top

Facebook Twitter Instagram LinkedIn YouTube RSS
©2016 Photonics Media
x Subscribe to Photonics Spectra magazine - FREE!