[1] J. B. Pendry, A. J. Holden, W. J. Stewart and I. Youngs, Physical review letters 76, 4773 (1996).
[2] J. B. Pendry, A. J. Holden, D. J. Robbins and W. J. Stewart, IEEE transactions on microwave theory and techniques 47, 2075 (1999).
[3] XiaoFei Zang, SuJi Liu, HanHong Gong, Yajun Wang and YiMing Zhu, Journal of the Optical Society of America B 35, 950 (2018).
[4] Dacheng Wang, Yinghong Gu, Yandong Gong, Cheng- Wei Qiu and Minghui Hong, Optics Express 23, 11114 (2015).
[5] Lei Zhu, Liang Dong, Jing Guo, FanYi Meng, Xun Jun He, Chun Hui Zhao and Qun Wu, Plasmonics 13, 1971 (2018).
[6] Wendy S. L. Lee, Rajour T. Ako, Mei Xian Low, Madhu Bhaskaran, Sharath Sriram, Christophe Fumeaux and Withawat Withayachumnankul, Optics Express 26, 14392 (2018).
[7] Zhengli Han, Seigo Ohno, Yu Tokizane, Kouji Nawata, Takashi Notake, Yuma Takida and Hiroaki Minamide, Optics letters 43, 2977 (2018).
[8] Oguzhan Akgol, Olcay Altintas, Emin Unal, Muharrem Karaaslan and Faruk Karadag, International Journal of Microwave and Wireless Technologies 10, 133 (2018).
[9] Yan Liu, Sai Chen, Fei Fan, Meng Chen, Jinjun Bai, Xianghui Wang and Shengjiang Chang, Optoelectronics Letters 13, 95 (2017).