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Directed and Continuous Jumping of Soft Robots via Instantaneous Topological Conversion
전지수,최준찬,이혁,조웅비,이광석,조맹효,김학린,위정재 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.2
Jumping motion is one of the representative rapid motions to circumvent obstacles as well as rough terrains. To achieve jumping motions, the adequate kinetic energy is essential to overcome the robots’ own body mass. Furthermore, toward miniaturized jumping robots, a remote powering system is desirable by embedding stimuli-responsive materials in a robot body. Here, we report untethered jumping soft robots with photoactive molecular switch which can induce light-triggered topological conversion. We synthesize monolithic soft robots by embedding azobenzene molecular switch into liquid crystalline monomer in 270° super twisted nematic geometry. Perpendicular alignment between top and bottom of soft robots induces bistable structures which generates a topological conversion that induces unprecedented photomechanical jumping. Finally, we will discuss strategy for directed and continuous jumping of soft robots by alternative light irradiation from top or bottom with intensity gradient.
박민규,박희원,주경일,정희동,최준찬,김학린 한국광학회 2016 Current Optics and Photonics Vol.20 No.6
We present a polarization-dependent prism array film for controlling the viewing angle distribution ofliquid crystal (LC) display panels without loss of light efficiency. On a directional backlight unit, ourpolarization-dependent prism array film, made into a stacked bilayer with a well-aligned liquid crystallinereactive mesogen (RM) layer on the UV-imprinted prism structure, can continuously control the lightrefraction function of the prism array by electrically switching incident polarization states of apolarization-controlling layer prepared by a twisted nematic LC mode. The viewing angle control propertiesof the polarization-dependent prism array film are analyzed under different prism angle and refractive indexconditions of the RM layer. A simple analytic model is also presented to describe the intermediate viewingangle distributions with continuously varying applied voltages and incident polarization states.
이동진,오성우,심규엽,최준찬,이준호,김병구,김학린 한국광학회 2016 Current Optics and Photonics Vol.20 No.1
We demonstrated the pretilt angle effect on the viewing angle properties of a single-domain fringe-fieldswitching (FFS) liquid crystal (LC) mode. By performing the Póincare sphere analysis, we investigated,in detail, the origin of the viewing angle asymmetry that exists in the single-domain FFS LC mode bothin the field-on and field-off states. Using this analysis, we confirmed that the pretilt angle reduces theviewing angle symmetry in the single-domain FFS LC mode. Finally, we examined the effect of a zeropretilt angle on the viewing angle symmetry by evaluating real single-domain FFS LC cells.