title: Realizing the concept of a scalable artificial iris with self-regulating capability by reversible photoreaction of spiropyran dyes.
abstract: We report a scalable artificial iris with self-regulating spoke patterns of a liquid crystalline polymer that resemble the iris frills of the human eye. The underlying concept relies primarily on the reversible photo-induced conformation change of spiropyran dyes embedded in a transparent polymer. The spoke patterns around the scalable pupil, defined by selective wetting inscription, were produced using reactive liquid crystalline mesogens on a flexible substrate through polymerization. The self-regulation capability of our artificial iris, not requiring driving circuits and peripheral sensors, plays a central role in developing a new class of biomedical and photonic devices in a monolithic architecture.
authors: School of Electrical Engineering, Seoul National University, Kwanak P.O. Box 34, Seoul 151-600, South Korea.
authors: Jun-Hee
authors: JH
authors: Na
authors: Seung Chul
authors: SC
authors: Park
authors: Youngjoo
authors: Y
authors: Sohn
authors: Sin-Doo
authors: SD
authors: Lee
mesh_terms: D001578:Benzopyrans / Q000737:chemistry / Q000494:pharmacology*; D004396:Coloring Agents / Q000737:chemistry / Q000494:pharmacology*; D005137:Eye, Artificial; D006801:Humans; D007211:Indoles / Q000737:chemistry / Q000494:pharmacology*; D007498:Iris / Q000187:drug effects* / Q000528:radiation effects*; D008027:Light; D050866:Liquid Crystals / Q000737:chemistry; D008968:Molecular Conformation; D009574:Nitro Compounds / Q000737:chemistry / Q000494:pharmacology*; D055668:Photochemical Processes / Q000187:drug effects* / Q000528:radiation effects; D011108:Polymers / Q000494:pharmacology; D013056:Spectrophotometry, Ultraviolet
chemical_list: D001578:Benzopyrans; D004396:Coloring Agents; D007211:Indoles; D009574:Nitro Compounds; D011108:Polymers; C088184:spiropyran