Photochemical imaging of plasmonically enhanced near-fields using light-induced mass transport in azo-polymer films (Conference Presentation)

Hidekazu Ishitobi

doi:10.1117/12.2317375

18 September 2018 Photochemical imaging of plasmonically enhanced near-fields using light-induced mass transport in azo-polymer films (Conference Presentation)

Hidekazu Ishitobi

Author Affiliations +

Proceedings Volume 10740, Molecular Machines; 107400B (2018) https://doi.org/10.1117/12.2317375
Event: SPIE Organic Photonics + Electronics, 2018, San Diego, California, United States

Abstract

Light-induced patterns of surface deformations in azobenzene containing polymer films have attracted much attention because of possible applications in optical data storage and in micro/nano fabrication. It is well known that such patterns reflect the state of the incident light polarization and the light intensity distribution. Trans ↔ cis photoselective isomerization and molecular reorientation play important roles in the deformation process. Among a variety of applications utilizing light-induced mass movement in azo-polymers, sub-diffraction imaging of optical near-fields is one of the most promising applications. In this application, optical near-field distribution in the vicinity of nano structures is transferred to surface deformations of azo-polymers through light-induced mass movement, where the spatial resolution can exceed the diffraction light of light. In addition to the high spatial resolution, not only intensity distribution but also polarization state of near-fields can be measured. In this presentation, we will report on photo-induced polymer movement induced by optical near-field in the vicinity of single gold nano-particles (GNPs). A linearly polarized (Ex) laser beam was irradiated into GNPs to excite local surface plasmon resonance that enhanced the near-field around the GNPs. The findings indicated that different GNP diameters (that is, 50 nm and 80 nm) resulted in different deformation patterns on the films. The results were compared with theoretical calculations of near-field distributions, and the observations revealed that the deformation patterns were dependent on the ratio between Ex and Ey wherein each possessed a different field distribution.

Conference Presentation

Citation Download Citation

Hidekazu Ishitobi "Photochemical imaging of plasmonically enhanced near-fields using light-induced mass transport in azo-polymer films (Conference Presentation)", Proc. SPIE 10740, Molecular Machines, 107400B (18 September 2018); https://doi.org/10.1117/12.2317375

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KEYWORDS

Near field

Near field optics

Polarization

Polymers

Resonance enhancement

Spatial resolution

Diffraction

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