Dr. Xianzhong Chen, Associate Professor in Institute of Photonics and Quantum Sciences at Herriot Watt University, will be giving a colloquium on Friday 8th April, 12.30-13.30 pm via Zoom. Dr. Chen leads the Experimental Nanophotonics Group at Herriot Watt, and his research highlights include first dual-polarity metalens for imaging, first image-switchable metasurface holograms for anti-counterfeiting, first multichannel device for manipulation of twisted light beams, and first demonstration of arbitrary polarization profile for image concealment.