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3. Qi-Dai Chen, Xiao-Feng Lin, Li-Gang Niu, Dong Wu, Wen-Quan Wang, and Hong-Bo Sun, Dammann gratings as integratable micro-optical elements created by laser micronanofabrication via two-photon photopolymerization, Opt. Lett. 33, 2559(2008). 

2. Dong Wu, Li-Gang Niu, Qi-Dai Chen, Rui Wang, and Hong-Bo Sun, High efficiency multilevel phase-type fractal zone plates, Opt. Lett. 35, 2913(2008).