Fluorescence Enhancement Under Controlled Electromagnetic Nanoenvironments
Abstract
In the proposed project we are investigating the role of the electromagnetic nanoenvironment on fundamental photophysical processes in molecular and ionic optically active species. Both nanoshells and nanopatterned surfaces are being used to apply specific and controlled local field enhancements to chromophores of interest. These structures are designed and analyzed using finite-difference time domain and Mie scattering methods to ensure close correspondence between the predicted and actual fields at the nanostructure. By detuning the plasmon resonance at or near a molecular or ionic resonance, the effect of the local field on specific, selected energy transitions within a chromophore can be studied. Changes in spontaneous emission rates due to the modified photon density of states resulting from confined geometries are also to be addressed. Specifically, we will investigate changes in single and multiphoton absorption and fluorescence in the spectral and time domains in molecular and rare earth optically active species; modifications in triplet state lifetime in molecular species; and enhancements of one and two-photon absorption when the plasmon resonance is tuned to the single photon virtual level.
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 31, 2003
- Accession Number
- ADA437918
Entities
People
- Naomi J. Halas
Organizations
- Rice University