@article {doi:10.1021/acsphotonics.0c01751,
	title = {Generalized Wavefront Manipulation: Dual-Foci Superfocusing with Hybrid-Magnitude Evanescent Modes and Terahertz Space-Division Multiplexing},
	journal = {ACS Photonics},
	volume = {8},
	number = {6},
	year = {2021},
	pages = {1592-1606},
	abstract = {To distinctively identify two objects at the deep-subwavelength scales requires sharp superfocusing to overcome the diffraction limit. However, conventional superfocusing effect and information-carrying capacity are limited by the focal length and single focusing field (only electric or magnetic field), which are hard to be apparently improved. Here, we introduce the concept of {\textquotedblleft}dual-foci superfocusing{\textquotedblright}, an advanced focusing form that can provide either one or two focusing spots, simultaneously converging both electric and magnetic fields and presenting an effect of electromagnetostatic space-division multiplexing. The physical mechanism of the dual-foci superfocusing is analyzed and synthesized by an original theory of shaping functional fields using hybrid-magnitude evanescent modes. Through a terahertz plasmonic array, the dual-foci superfocusing is numerically demonstrated, whose metric (ratio of focal length to focusing-spot size) is sufficiently improved from traditional 1{\textendash}1.8 up to 2.8. The proposed methodology could be exploited as a platform to investigate the novel concurrent characteristics of superfocusing and might represent an important step toward the development of beam manipulation and sophisticated holography.},
	doi = {10.1021/acsphotonics.0c01751},
	url = {https://doi.org/10.1021/acsphotonics.0c01751},
	author = {Feng-Yuan Han and Li-Zheng Yin and Chao-Hai Du and Pu-Kun* Liu}
}
