Finite-element method for obtaining the regularized photon Green function in lossy material Meng Tian, Yong-Gang Huang, Sha-Sha Wen, Hong Yang, Xiao-Yun Wang, Jin-Zhang Peng and He-Ping Zhao EPL, 126 1 (2019) 13001 Published online: 22 May 2019 DOI: 10.1209/0295-5075/126/13001