Debye-diffraction-based concentric energy analysis on two-photon photoluminescence imaging of gold nanorods under radial polarization illumination

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Title: Debye-diffraction-based concentric energy analysis on two-photon photoluminescence imaging of gold nanorods under radial polarization illumination
Author(s): Kang, Hong; Gu, Min
Abstract: Gold nanorods have been identified to be useful contrast agents as they exhibit pronounced two-photon photoluminescence under laser illumination of appropriate intensity and polarization configurations. In this paper, the two-photon photoluminescence imaging of three-dimensionally randomly oriented gold nanorods under linear and radial polarization illumination is investigated through a concentric energy analysis based on the Debye diffraction theory. Consequently, the effect of the numerical aperture and the apodization function of an objective on the polarization distribution in the focal region can be analyzed to form an important part in the understanding on the efficient excitation of gold nanorods. It is demonstrated that the radially polarized beam is an effective laser mode in generating strong two-photon imaging of nanorods in the presence of objectives with high numerical aperture and large annular obstruction sizes.
Publication type: Journal article
Research centre: Swinburne University of Technology. Faculty of Engineering and Industrial Sciences. Centre for Micro-Photonics
Source: Journal of Applied Physics, Vol. 112, no. 8 (Oct 2012), article no. 083106
Publication year: 2012
FOR Code(s): 01 Mathematical Sciences; 02 Physical Sciences; 09 Engineering
Keyword(s): Concentric energy; Debye diffraction theory; Gold nanorods; Imaging; Radial polarization illumination; Two-photon photoluminescence
Publisher: American Institute of Physics
ISSN: 0021-8979
Publisher URL: http://dx.doi.org/10.1063/1.4759259
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