Bi-phase emulsion droplets as dynamic fluid optical systems Sara Nagelberg, Amy Goodling, Kaushikaram Subramanian, George Barbastathis, Moritz Kreysing, Tim Swager, Lauren Zarzar and Mathias Kolle EPJ Web Conf., 215 (2019) 13003 Published online: 10 September 2019 DOI: 10.1051/epjconf/201921513003