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The formation mechanism of laser-induced periodic surface structures (LIPSS) has been a key to high-resolution sub-diffraction lithography or high-efficiency large-area nanotexturing. We show the evolution of LIPSS formation from a nanohole seed structure to high-spatial-frequency LIPSS by using a tightly focused and rectangular-shaped laser beam with different shape-polarization orientations. Formation of LIPSS based on light intensity distribution without invoking any long-range electromagnetic modes achieved quantitative match between modeling and experiment.
View Article and Find Full Text PDFNanotextured Dynamics of a Light-Induced Phase Transition in VO.
Nano Lett
November 2021
Department of Physics, Columbia University, New York, New York 10027, United States.
We investigate transient nanotextured heterogeneity in vanadium dioxide (VO) thin films during a light-induced insulator-to-metal transition (IMT). Time-resolved scanning near-field optical microscopy (Tr-SNOM) is used to study VO across a wide parameter space of infrared frequencies, picosecond time scales, and elevated steady-state temperatures with nanoscale spatial resolution. Room temperature, steady-state, phonon enhanced nano-optical contrast reveals preexisting "hidden" disorder.
View Article and Find Full Text PDFShape-Programmed Fabrication and Actuation of Magnetically Active Micropost Arrays.
ACS Appl Mater Interfaces
April 2020
Department of Polymer Science and Engineering, Inha University, Incheon 22212, South Korea.
Micro- and nanotextured surfaces with reconfigurable textures can enable advancements in the control of wetting and heat transfer, directed assembly of complex materials, and reconfigurable optics, among many applications. However, reliable and programmable directional shape in large scale is significant for prescribed applications. Herein, we demonstrate the self-directed fabrication and actuation of large-area elastomer micropillar arrays, using magnetic fields to both program a shape-directed actuation response and rapidly and reversibly actuate the arrays.
View Article and Find Full Text PDFDeterministic nanotexturing by directional photofluidization lithography.
Adv Mater
August 2011
Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology, Daejeon, Korea.
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