1 research outputs found
Programming Nanoparticles in Multiscale: Optically Modulated Assembly and Phase Switching of Silicon Nanoparticle Array
Manipulating and
tuning nanoparticles by means of optical field
interactions is of key interest for nanoscience and applications in
electronics and photonics. We report scalable, direct, and optically
modulated writing of nanoparticle patterns (size, number, and location)
of high precision using a pulsed nanosecond laser. The complex nanoparticle
arrangement is modulated by the laser pulse energy and polarization
with the particle size ranging from 60 to 330 nm. Furthermore, we
report fast cooling-rate induced phase switching of crystalline Si
nanoparticles to the amorphous state. Such phase switching has usually
been observed in compound phase change materials like GeSbTe. The
ensuing modification of atomic structure leads to dielectric constant
switching. Based on these effects, a multiscale laser-assisted method
of fabricating Mie resonator arrays is proposed. The number of Mie
resonators, as well as the resonance peaks and dielectric constants
of selected resonators, can be programmed. The programmable light-matter
interaction serves as a mechanism to fabricate optical metasurfaces,
structural color, and multidimensional optical storage devices