Accession Number : ADA447299


Title :   Semiconductor Nanocrystal Photonics


Descriptive Note : Final rept. 1 Sep 2002-31 Aug 2005


Corporate Author : ROCHESTER UNIV NY OFFICE OF RESEARCH AND PROJECT ADMINISTRATION


Personal Author(s) : Krauss, Todd D.


Full Text : http://www.dtic.mil/get-tr-doc/pdf?AD=ADA447299


Report Date : 31 AUG 2005


Pagination or Media Count : 9


Abstract : The overall objective of the project is to take advantage of the unique photon density of states of periodic structures to enhance the energy transfer between two sizes of semiconductor nanocrystals placed inside a planar optical microcavity. We have fabricated thin films of two sized CdSe nanocrystals with controllable thickness. These films show efficient energy transfer from the smaller to the larger nanocrystals as measured by steady state and time resolved fluorescence. We have successfully deposited these films in the middle of single-mode, planar optical microcavities and measured spectrally narrow optical emission from the cavity. We have also measured increased fluorescence in the cavity by a factor of 13 from the larger nanocrystals (relative to free space) due to the combination of energy transfer processes and enhancement from the cavity. Finally, we have succeeded in fabricating highly fluorescent and size-tunable PbS nanocrystals and detecting their fluorescence on the single particle level. Studies of PbS and PbSe nanocrystals are especially interesting and important because they provide an alternative NC material that can emit throughout the technologically important near-infrared region. Preliminary results coupling PbSe NC fluorescence into near infrared optical cavities and waveguides have also been achieved.


Descriptors :   *ENERGY TRANSFER , *PHOTONS , *NEAR INFRARED RADIATION , STEADY STATE , OPTICAL PROPERTIES , FLUORESCENCE , NANOTECHNOLOGY , CADMIUM SELENIDES , SEMICONDUCTORS , THIN FILMS , FABRICATION , WAVEGUIDES


Subject Categories : ELECTRICAL AND ELECTRONIC EQUIPMENT
      NON-ELECTRICAL ENERGY CONVERSION


Distribution Statement : APPROVED FOR PUBLIC RELEASE