@article {doi:10.1063/1.5050696,
	title = {Superfocusing plate of terahertz waves based on a gradient refractive index metasurface},
	journal = {Journal of Applied Physics},
	volume = {124},
	number = {20},
	year = {2018},
	pages = {204902},
	doi = {10.1063/1.5050696},
	url = {https://doi.org/10.1063/1.5050696},
	author = {Feng-Yuan Han and Tie-Jun Huang and Li-Zheng Yin and Jiang-Yu Liu and Pu-Kun* Liu}
}
