Advanced Laser Science
Advanced Energy Conversion Division Advanced Laser Science Research Section
Associate Professor : Takashi NAKAJIMA
The use of lasers enables us to provide energy to the target materials and monitor their real-time change without any physical contact. We fully utilize such properties of lasers to synthesize nanomaterials and carry out the real-time monitoring of their dynamics.
In-situ synthesis and real-time analysis of nanomaterials using lasers
Thin films are widely used in many different fields. Typical strategies to modify the film properties are to introduce a multilayer structure or nanoparticles in the film matrix. Although precisely designed multilayer films already possess nice properties they would be better if nanostructures are introduced. As for the introduction of nanoparticles into the film matrix it is known that the direct dispersion of nanoparticles into the film matrix is not trivial, since aggregation easily takes place. One way to solve this problem is to do the in-situ synthesis of nanoparticles in the film matrix. Both of these, i.e., nanostructuring of the (multilayered) film and in-situ synthesis of nanocomposite films, can be rapidly and easily realized if we use lasers, and our research focuses on developing laser-based new schemes for the rapid nanostructuring/in-situ synthesis of nanomaterials and the real-time monitoring of the associated dynamics.
Formation of nanostructure in Au films
The color of Au films changes to violet after the laser irradiation (top figure), and accordingly the optical spectra also change (bottom figure).
In-situ synthesis of polymer-metal nanocomposite film
By irradiating a CO2 laser at 1 W for 10 sec the polymer film with a precursor of nanoparticles becomes nanocomposite films.