Direct Writing of Photonic Structures by Two-Photon Polymerization Yan Li, ZhaoPei Liu, HaiBo Cui, Yun-Feng Xiao, Hong Yang and Qihuang Gong MATEC Web of Conferences, 8 (2013) 06002 Published online: 18 November 2013 DOI: 10.1051/matecconf/20130806002