Article pubs.acs.org/journal/apchd5
Multicolor Changeable Optical Coating by Adopting Multiple Layers of Ultrathin Phase Change Material Film Sijung Yoo, Taehong Gwon, Taeyong Eom, Sanggyun Kim, and Cheol Seong Hwang* Department of Material Science and Engineering and Inter-university Semiconductor Research Center, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul, 151-742, Republic of Korea
ABSTRACT: The multilayered optical coating whose structure consists of optical cavity and multiple layers of ultrathin phase change material (PCM) film is presented. The color changing is enabled via transition between amorphous and crystalline phases of PCM, which is accompanied by high optical contrast. The phase transition of each PCM layer, separated by ultrathin oxide barrier, can be realized through various crystallization temperatures with respect to the different thickness of ultrathin (
