期刊
ANNALEN DER PHYSIK
卷 532, 期 10, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/andp.202000373
关键词
dielectric particles; low-loss materials; Mie theory; near-field focusing; Teflon spheres
资金
- Centre for Photonic Expertise (CPE) by Welsh European Funding Office (WEFO), UK [81400]
- European Union H2020 research and innovation programme [737164]
A Teflon (polytetrafluoroethylene) sphere can be used as a focusing lens in the applications of imaging and sensing due to its low-loss property in the terahertz band. Herein, field intensities and focusing parameters are analytically calculated for Teflon spheres at different low-loss levels and then a super-enhancement focusing effect in the spheres with particular size parameters was discovered, which can stimulate about 4000 times stronger field intensity than that for incident radiation as well as the great potential of overcoming diffraction limit despite high sensitivity to the magnitude of Teflon loss. A subsequent analysis of scattering amplitudes proves that the strong scattering of a single-order mode in the internal electric or magnetic field is the main factor causing this phenomenon.
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