Loss induced negative refraction and super-prism effect at highly absorptive interface
Wu Jian1, 4, †, Wang Tao1, Hou Tianyue1, Kan Xuefen2, Yin Cheng2, 3, 4, Zhou Pu1, ‡, Cao Zhuangqi3
       

Equifrequency diagram for silver, where the parameters are ε = 5 , ωp=9.2 eV, and Γ=0.021 eV.[17]