Browsing by Author "Baek, Jonghyeok"

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    3D touchless multiorder reflection structural color sensing display
    (American Association for the Advancement of Science, 2020) Kang, Han Sol; Han, Sang Won; Park, Chanho; Lee, Seung Won; Eoh, Hongkyu; Baek, Jonghyeok; Shin, Dong-Gap; Park, Tae Hyun; Huh, June; Lee, Hyungsuk; Kim, Dae-Eun; Ryu, Du Yeol; Thomas, Edwin L.; Koh, Won-Gun; Park, Cheolmin
    The development of a lightweight, low-power, user-interactive three-dimensional (3D) touchless display in which a human stimulus can be detected and simultaneously visualized in noncontact mode is of great interest. Here, we present a user-interactive 3D touchless sensing display based on multiorder reflection structural colors (SCs) of a thin, solid-state block copolymer (BCP) photonic crystal (PC). Full-visible-range SCs are developed in a BCP PC consisting of alternating lamellae, one of which contains a chemically cross-linked, interpenetrated hydrogel network. The absorption of a nonvolatile ionic liquid into the domains of the interpenetrated network allows for further manipulation of SC by using multiple-order photonic reflections, giving rise to unprecedented visible SCs arising from reflective color mixing. Furthermore, by using a hygroscopic ionic liquid ink, a printable 3D touchless interactive display is created where 3D position of a human finger is efficiently visualized in different SCs as a function of finger-to-display distance.