Theoretical study on the mechanism and dynamics of nanostructure fabrication using localized photons

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The purpose of the study was (1) to quantum-theoretically formulate an interacting system constituting of photons, electronic polarizations, and phonons in pseudo-one dimensional materials with a finite size, and to build a theoretical model providing experimentalists with guiding information, (2) to predict collective phenomena due to near-field effects, which would be applied to nanostructure fabrication, and to clarify the elemental process in nanofabrication. As described below, we have obtained a theoretical model to predict localized photons dressed by coherent (multiple) phonons, which is inherent phenomenon in the relevant system, as well as qualitative understanding of the mechanism of nanodot formation using localized photons.In the first year, we have formulated optical response at the nanoscale, using a quasiparticle basis, which puts electronic and vibrational excitations on an equal footing with photons. As a result, we showed the occurrence of a localized photon dressed … More by multi-(coherent) phonons, which cannot be driven by a perturbation theory, clarifying the occurrence conditions. Such photons are shown to be localized at the edge of a pseudo-one dimensional nanometric system by anti- Hermitian transformation of the interaction between a photon and a phonon localized due to the impurities doped in the system. Then the mechanism of spatial localization of photons dressed by coherent phonons was clarified, and it followed that molecular photodissociation with optical near fields can be assisted by molecular vibrational excitation forbidden in case of propagating far fields, and that unresolved problems on the experimental results are explained consistently. Finally, we have examined the deposition process of nanodot fabrication with optical near fields to find a possibility of the dot-size control.The approach employed is unique and important not only from the principle viewpoint to break the diffraction limit of light, but also from the viewpoint of foundation for nanophotonics and nanofabrication controlled. Less