New Research


2017/10/31

Light manipulates nanostructure, nanostructure does light

- Design of light-nanostructure interaction for creating novel photo-functions -

Prof. Hajime Ishihara Assist. Prof. Tomohiro Yokoyama

The light-matter interaction has been a central subject in a variety of research fields such as physics, chemistry and so on. In particular, nanostructures have been attracting attention because of their peculiar nature not existing in bulk materials. The individual nanostructures exhibit their specific properties according to their size or shape, and hence, we can "design" the light-matter interaction by controlling nanostructures, which leads to the realization of a variety of unconventional photo-functions. Our group is pursuing a new avenue toward photo-science and photo-technology for nanostructures by studying how we can control the motion of light by nanostructures and how we can manipulate that of nanostructures by light, which is based on the design of light-matter interaction. Further, we are developing a new technology to create novel ordered structures by optical manipulation of nanostructures. The followings are our recent achievements.

1) We demonstrated a giant photo-switching and an ultrafast radiative emission overcoming the thermal damping through the design of the interplay between the electronic waves confined in nanostructures and light wave. Also, we realized light absorption of non-light-absorbing materials by confining the light electric field in a nano-space.

2) We have developed a new theoretical framework to study the design of synchronization phenomena. We applied this theory to analyze the photoluminescence of the dye ensemble dispersed on a dielectric microsphere, and found a great enhancement of the luminescence efficiency. This finding leads to the principle for the development of the highly efficient luminous elements.

3) It is known that one can mechanically manipulate small objects by using the laser light. So far, the optical manipulation of nanostructure has been difficult. However, we have theoretically demonstrated its possibility by taking into account an interaction between light and the electrons confined in nanostructures. The result leads to the novel optical manipulation for sorting and selection of quantum mechanical characteristics of individual nanostructures.   


Ishihara Labo HP
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