Iba Ayato, Domier Calvin W, Ikeda Makoto, Mase Atsushi, Nakajima Makoto, Pham Anh-Vu, Luhmann Neville C
Opt Lett. 2021 Oct 1;46(19):4912-4915. doi: 10.1364/OL.434825.
This Letter describes a super-oscillatory lens (SOL), with concentric ring-type metallic slits photolithographically fabricated on a glass substrate, that can function at subterahertz frequencies. The SOL has been investigated both experimentally and theoretically and demonstrates a spatial resolution of 1.5 mm (0.5), which is 0.45 times the diffraction limit, with a focal length of 75 mm (25) at 100 GHz (=3). Furthermore, the depth of focus of the lens was measured to be 47 mm, which is 10.8 times larger than that of a conventional lens. This type of SOL, with subdiffraction focusing, is thus highly effective for use in industrial inspections with millimeter and terahertz waves.
本信函描述了一种超振荡透镜（SOL），它是通过光刻技术在玻璃基板上制作出同心环形金属狭缝，可在亚太赫兹频率下工作。对该超振荡透镜进行了实验和理论研究，结果表明其空间分辨率为1.5毫米（0.5λ），是衍射极限的0.45倍，在100吉赫兹（=3λ）频率下焦距为75毫米（25λ）。此外，测得该透镜的焦深为47毫米，比传统透镜的焦深大10.8倍。因此，这种具有亚衍射聚焦功能的超振荡透镜在毫米波和太赫兹波工业检测中具有很高的效率。
