Airy disk formula

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Abbediffractionlimit

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 ($0.5\lambda$), which is 0.45 times the diffraction limit, with a focal length of 75 mm ($25\lambda$) at 100 GHz ($\lambda =3\; {\rm mm}$). 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.

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Diffractionlimit calculator

Ayato Iba,1,2,* Calvin W. Domier,3 Makoto Ikeda,1 Atsushi Mase,4 Makoto Nakajima,2 Anh-Vu Pham,3 and Neville C. Luhmann, Jr.3

Zhu Li, Changtao Wang, Yanqin Wang, Xinjian Lu, Yinghui Guo, Xiong Li, Xiaoliang Ma, Mingbo Pu, and Xiangang Luo Opt. Express 29(7) 9991-9999 (2021)

Data underlying the results presented in this paper are not publicly available at this time but may be obtained from the authors upon reasonable request.

Diffractionlimit

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You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution. Contact your librarian or system administrator or Login to access Optica Member Subscription

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 ($0.5\lambda$), which is 0.45 times the diffraction limit, with a focal length of 75 mm ($25\lambda$) at 100 GHz ($\lambda =3\; {\rm mm}$). 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.