U.K. graduate students Mansoor Sultan and Fatih Balli will present their work on "flat" optics at the SPIE Optics+Photonics meeting in August. Their abstracts can be found on the SPIE conference website."3D printed color focusing filters," Mansoor A. Sultan, Fatih Balli, Daniel L. Lau, J. Todd Hastings"Rotationally tunable polarization-insensitive metasurfaces for generating vortex beams," Fatih Balli, Mansoor Sultan, J. Todd Hastings