A study of optical anisotropy for nearly spherical gold nanoparticles: toward a sensitive detection using polarization microscopy in biomolecular applications

Bassam AL-Qadi; Saiki Toshiharu

doi:10.1117/12.808913

20 February 2009 A study of optical anisotropy for nearly spherical gold nanoparticles: toward a sensitive detection using polarization microscopy in biomolecular applications

Bassam AL-Qadi, Saiki Toshiharu

Author Affiliations +

Proceedings Volume 7190, Reporters, Markers, Dyes, Nanoparticles, and Molecular Probes for Biomedical Applications; 719016 (2009) https://doi.org/10.1117/12.808913
Event: SPIE BiOS, 2009, San Jose, California, United States

Abstract

Anisotropic metal nanoparticles strongly change the scattered light polarization compared with isotropic nanoparticles, and this property can be utilized in a sensitive bimolecular recognition due to the high contrast that could be achieved in polarization microscopy. We report a study of the shape anisotropy in nearly spherical gold nanoparticles and particle dimers. It was obvious that each particle has its own scattering polarization dependence which reflects the relative changes in morphologies. Our experimental results reveal that particles with minimum anisotropy don't change the scattering light polarization which indicates their homogenous shape. Another particles show polarization dependence scattering intensity due to pronounced anisotropy. Particle dimers possess shape anisotropy that is characterized by a different polarizability for each axis in the nanostructure. We resolved the internal inhomogeneity in single particles and particle dimers using a qualitative analysis which enabled us to determine the polarizabilities of both long and short axes for each particle and particle pair. A few of single particles show a strong optical anisotropy relative to their shape anisotropy, and even this observation was not yet clarified, it could be used in a sensitive bimolecular detection.

Citation Download Citation

Bassam AL-Qadi and Saiki Toshiharu "A study of optical anisotropy for nearly spherical gold nanoparticles: toward a sensitive detection using polarization microscopy in biomolecular applications", Proc. SPIE 7190, Reporters, Markers, Dyes, Nanoparticles, and Molecular Probes for Biomedical Applications, 719016 (20 February 2009); https://doi.org/10.1117/12.808913

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