Laser-induced forward transfer (LIFT) is a direct-writing technique enabling deposition of a film. In addition, a single dot smaller than the laser wavelength can be deposited at small shot energy, and the case is called as laser-induced dot transfer (LIDT). In conventional LIDT experiments, multi-shots with step scanning have been used to form array structures, which are useful in plasmonics, pho-chemistry, light harvest, etc..
On the other hand, interference laser processing can achieve an arrayed process and generate a periodic structure in a single shot. In this presentation, the results of LIDT technique which uses a femtosecond laser interference pattern will be presented. As a result, an array of Au nanodots with 3.6 m period was successfully deposited, producing the following unit structures: a single dot, adjoining dots, and stacking dots.
This new technique produces high-purity, catalyst-free nanodots in array that do not require post-cleaning or alignment processes.
We found that plasmonic optical trapping of soft nanomaterials were driven not only by an enhanced optical force but also by thermophoretic force. Since thermophoresis exerted on the nanomaterials strongly depends on their size and the surrounding medium, it is potentially applicable for a manipulation method of nanomaterials. In the present study, by taking advantage of the thermophoresis, we demonstrated thermophoresis-assisted optical trapping of pyrene-labeled hydrophilic polymer chains on plasmonic nanostructures.
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