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Optical funnel: broadband and uniform compression of electromagnetic fields to an air neck
Photonics Research ( IF 7.6 ) Pub Date : 2021-08-11 , DOI: 10.1364/prj.432030
Fei Sun , Yichao Liu , Yibiao Yang

An optical funnel, which performs as a passive electromagnetic compressor, can guide electromagnetic waves from a wide inlet to a narrow outlet without reflectance/scattering and squeeze electromagnetic fields uniformly to an air neck. In this study, an optical funnel is designed by precisely filling subwavelength ceramic blocks with a gradient refractive index inside a tapered waveguide. The gradient refractive index is designed by transformation optics, which is isotropic and all above unit, thus exhibiting a broadband feature. Due to the mechanism of impedance matching over the whole funnel, extremely low reflectance/scattering and stable enhancement of fields can be achieved. The field enhancement factor in different regions of the funnel (e.g., in the air neck) can be flexibly designed just by modifying the funnel-width ratios.

中文翻译:

光学漏斗:将电磁场宽带且均匀地压缩到气颈

光学漏斗作为无源电磁压缩器,可以将电磁波从宽入口引导到窄出口,而不会发生反射/散射,并将电磁场均匀地挤压到空气颈部。在这项研究中,通过在锥形波导内精确填充具有梯度折射率的亚波长陶瓷块来设计光学漏斗。梯度折射率由变换光学设计,具有各向同性和以上单位,从而表现出宽带特性。由于整个漏斗的阻抗匹配机制,可以实现极低的反射/散射和场的稳定增强。仅通过修改漏斗宽度比,就可以灵活地设计漏斗不同区域(例如,在空气颈中)的场增强因子。
更新日期:2021-09-02
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