Finite-element method for obtaining the regularized photon Green function in lossy materialMeng Tian, Yong-Gang Huang, Sha-Sha Wen, Hong Yang, Xiao-Yun Wang, Jin-Zhang Peng and He-Ping ZhaoEPL, 126 1 (2019) 13001DOI: https://doi.org/10.1209/0295-5075/126/13001