Nonvolatile, Multicolored Photothermal Writing of Block Copolymer Structural Color

• DOI: 10.1002/adfm.201904055
• Publication Date: 2019-07-11T06:59:45Z
• Authors: Hongkyu Eoh; Han Sol Kang; Min Ju Kim; Min Koo; Tae Hyun Park; Yeongsik Kim; Hanwhuy Lim; Du Yeol Ryu; Eunkyoung Kim; June Huh; Youngjong Kang; Cheolmin Park
• Keywords: Photothermal effect; Holographic Data Storage

Abstract In spite of efforts to fabricate stimuli‐sensitive structural colors (SCs) self‐assembled block copolymer (BCP) photonic crystals (PCs) with potential applications in displays, media boards, and sensors, few studies have demonstrated BCP PCs suitable for high‐density nonvolatile information storage. Herein, a simple but robust route multilevel recording using PC is presented. The proposed method based on the spatially controlled crosslinking microdomains induced by photothermal conversion. Photothermal SC writing accomplished via time‐ position‐controlled laser exposure thin poly(styrene‐ ‐quaternized 2‐vinyl pyridine) (PS‐ b ‐QP2VP) films deposited layer poly(3,4‐ethylenedioxythiophene) doped tosylate (PP‐PEDOT). Upon near‐infrared (NIR) irradiation this structure, PP‐PEDOT underlayer converts NIR light into thermal energy locally irradiated region, which subsequently transferred top consisting alternating in‐plane PS QP2VP lamellar stacks. layers are vulnerable crosslinking, giving rise programmable SCs. degree domains depends power time, allows multi‐SC per spot, leading novel optical medium PCs.