Image distance shift effect of the metal superlens and its applications to photolithography Jianjie Dong, Juan Liu, Xingxing Zhao, Peng Liu, Jinghui Xie and Yongtian Wang EPL, 102 2 (2013) 24002 Published online: 06 May 2013 DOI: 10.1209/0295-5075/102/24002