光学
贝塞尔光束
太赫兹辐射
叠加原理
衍射效率
材料科学
贝塞尔函数
谐振器
衍射
波长
锥面
光电子学
超材料
极化(电化学)
物理
化学
物理化学
量子力学
复合材料
作者
Jiahao Miao,Zhanxuan Zhou,Yi Liu,Cong Lin,Xincheng Zhu,Zhuoran Sun,Xiaomei Yu
出处
期刊:Optics Letters
[The Optical Society]
日期:2023-09-13
卷期号:48 (19): 5117-5117
被引量:1
摘要
In this paper, we propose a reflective terahertz (THz) Bessel metalens that utilizes polarization-insensitive sub-wavelength metal resonator–dielectric–metal structures. The Bessel metalens is configured with the superposition of hyperboloidal and conical phase profiles, resulting in a high-efficiency and long non-diffractive length Bessel beam. Our experimental results demonstrate that the proposed Bessel metalens has a focusing efficiency of 72.1% and a non-diffractive length of 239λ. This device has promising aspects in the fields of THz imaging systems and other miniaturized and integrated scenes that require non-diffractive Bessel beams.
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