Super-enhancement focusing of Teflon sphere
Abstract
A Teflon (Polytetrafluoroethylene, PTFE) sphere can be used as a focusing lens in the applications of imaging and sensing due to its low-loss property in the terahertz (THz) band. In this paper, we analytically calculated field intensities and focusing parameters for Teflon spheres at different low-loss levels and then discovered a super-enhancement focusing effect in the spheres with particular size parameters, 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 proved that the strong scattering of a single order mode in the internal electric or magnetic field is the main factor causing this phenomenon.
Keywords
Cite
@article{arxiv.2008.00750,
title = {Super-enhancement focusing of Teflon sphere},
author = {Liyang Yue and Zengbo Wang and Bing Yan and James N. Monks and Yasir Joya and Rakesh Dhama and Oleg V. Minin and Igor V. Minin},
journal= {arXiv preprint arXiv:2008.00750},
year = {2020}
}
Comments
12 pages, 6 figures