Journal
OPTICS COMMUNICATIONS
Volume 458, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.optcom.2019.124764
Keywords
Subdiffraction; Subwavelength; Terahertz
Categories
Funding
- National Key Basic Research and Development Program of China [2013CBA01700]
- National Natural Science Foundation of China [61575031, 61177093, 61474011]
- Program for New Century Excellent Talent in University [NCET-13-0629]
- Fundamental Research Funds for the Central Universities [106112016CDJZR125503, 106112016CDJXZ238826]
- Natural Science Foundation of Chongqing, China [cstc2019jcyj-msxmX0315]
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Terahertz lens is an essential component in terahertz application. We propose a focusing of total electric fields planar lens based on super-oscillation. This planar lens is designed for a wavelength (lambda) of 118.8 mu m with a radius of 160 lambda, a focal length of 210 lambda and a numerical aperture of 0.606. Our experiment demonstrates a subdiffraction and subwavelength focusing of total electric fields. The full width at half-maximum of the focal spot is 0.67 lambda, which is smaller than the diffraction limit of 0.825 lambda. The results shows that it has powerful application for terahertz imaging, especially in the fields of biomedical science.
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