Optical nanometric measurement utilizing light-induced movement in azo-polymers
When light is irradiated to polymers having azobenzene moieties as side-chains (azo-polymers), the polymer is deformed by molecular movement during photo-isomerization. By utilizing this phenomena, photon energy can be directly converted to mechanical energy, which results in the realization of a mechanical function and its application to molecular nano-machines driven by light. Moreover, the optical near-field around nano-structures, which cannot be observed by a normal optical microscope due to the diffraction limit of light, can be observed by utilizing the property that the induced deformation pattern is dependent on the incident light intensity distribution and the state of the light polarization. In this report, we review light-induced mass movement in azo-polymers, and then show its application to nano-imaging of a plasmonically enhanced near-field in the vicinity of single gold nano-particles.
- 1 Graduate School of Frontier Biosciences, Osaka University