tailieunhanh - Báo cáo hóa học: "Mapping the Polarization Pattern of Plasmon Modes Reveals Nanoparticle Symmetry"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Mapping the Polarization Pattern of Plasmon Modes Reveals Nanoparticle Symmetry | Nanoscale Res Lett 2008 3 348-349 DOI S11671-008-9158-9 NANO SPOTLIGHTS Mapping the Polarization Pattern of Plasmon Modes Reveals Nanoparticle Symmetry Published online 5 September 2008 to the author 2008 Single molecule labeling cancer treatment enhancement of non-linear optical effects or light guiding have demanded much attention from the scientific community and as a possible solution plasmon resonances of noble metal nanoparticles are explored. A major advancement in single molecule optics has been the polarization analysis of light from single fluorescent emitters. This analytical method has been utilized to study the conformational dynamics of biomolecules and their spatial arrangement. At different wavelengths of the excitation light different oscillation modes are excited making it important to know the polarization pattern as a function of wavelength. Knowing the polarization pattern of plasmonic nanostructures is therefore not only important to understand the fundamental physics of light interaction with these structures but also allows to discriminate different oscillation modes within one particle and to distinguish differently shaped particles within one sample. Several techniques have been used to extract optical spectra of single plas-monic nanoparticles most efficiently using dark-field microscopy but little is known about the polarization state. So far the very few reported plasmon polarization studies were obtained by rotating a polarizer by hand or on ensembles and not combined with spectroscopic information Prof. Carsten Sonnichsen explains to Nano Spotlight. We have developed a new microscope setup RotPOL which allows obtaining polarization-dependent scattering spectra in a fast and easy way Olaf Schubert continues explaining to Nano Spotlight. RotPOL uses a wedge shaped quickly rotating polarizer which splits the light of a point source into a ring in the image plane encoding the polarization information in a spatial image. Scheme 1 .