Rapid Assembly of Colloidal Crystals under Laser Illumination on a GeSbTe Substrate

Kei Yamaguchi, Eiji Yamamoto, Ryo Soma, Bokusui Nakayama, Masashi Kuwahara, Toshiharu Saiki

Research output: Contribution to journalArticle

Abstract

Optical techniques have been actively studied for manipulating nano-to microsized objects. However, long-range attraction and rapid transport of particles within thin quasi-two-dimensional systems are difficult because of the weak thermophoretic forces. Here, we introduce an experimental system that can rapidly generate quasi-two-dimensional colloidal crystals in deionized water, sandwiched between two hard plates. When a pulsed laser is irradiated on a chalcogenide phase-change material spattered on one side of the plates, the induced Marangoni-like flow causes a colloidal self-assembly in the order of tens of micrometers within the laser spot, with a transport velocity of a few tens of micrometers per second. This is due to the large thermal gradient induced by chalcogenide characteristics of high laser absorption and low thermal conductivity, and a strong hydrodynamic slip flow at the hydrophobic chalcogenide interface. Moreover, the colloidal crystals exhibit various lattice structures, depending on the laser intensity and chamber distance. For a certain range of the chamber distance, the colloidal crystal phases can be alternated by tuning the laser intensity in real time. Our system forms and deforms quasi-two-dimensional colloidal crystals at an on-demand location on a GeSbTe substrate.

Original languageEnglish
Pages (from-to)6403-6408
Number of pages6
JournalLangmuir
Volume35
Issue number19
DOIs
Publication statusPublished - 2019 May 14

Fingerprint

assembly
Lighting
illumination
Crystals
Lasers
Substrates
crystals
lasers
micrometers
chambers
slip flow
phase change materials
Phase change materials
Deionized water
Pulsed lasers
Crystal lattices
Thermal gradients
Self assembly
attraction
self assembly

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Spectroscopy
  • Electrochemistry

Cite this

Rapid Assembly of Colloidal Crystals under Laser Illumination on a GeSbTe Substrate. / Yamaguchi, Kei; Yamamoto, Eiji; Soma, Ryo; Nakayama, Bokusui; Kuwahara, Masashi; Saiki, Toshiharu.

In: Langmuir, Vol. 35, No. 19, 14.05.2019, p. 6403-6408.

Research output: Contribution to journalArticle

Yamaguchi, Kei ; Yamamoto, Eiji ; Soma, Ryo ; Nakayama, Bokusui ; Kuwahara, Masashi ; Saiki, Toshiharu. / Rapid Assembly of Colloidal Crystals under Laser Illumination on a GeSbTe Substrate. In: Langmuir. 2019 ; Vol. 35, No. 19. pp. 6403-6408.
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