Dynamic control of reflective/diffusive optical surfaces on EGaIn liquid metal

Keisuke Nakakubo, Hiroaki Yoshioka, Kinichi Morita, Ryoichi Ishimatsu, Abolfazl Kiani, Hans Hallen, Michael D. Dickey, Yuji Oki

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)


We report a method to dynamically control the surface of gallium-based liquid metal to switch between reflective/diffusive states by removing/depositing oxide films via electrochemical redox reactions. Electrochemical oxidation deposits rough surface oxides that are optically diffusive. Electrochemical reduction returns the metal to a pristine, smooth, and reflective state. This switching is achieved using only ±1.4V. In addition, a meniscus of liquid metal can be pumped to switch between concave/convex shapes. This work expands the range of optical applications of dynamic liquid metal surfaces.

Original languageEnglish
Pages (from-to)2099-2108
Number of pages10
JournalOptical Materials Express
Issue number7
Publication statusPublished - Jul 1 2021

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials


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