• Advanced Photonics
  • Vol. 3, Issue 4, 045002 (2021)
Yanwen Hu1, Shiwang Wang1, Junhui Jia1, Shenhe Fu1、2、*, Hao Yin1、2, Zhen Li1、2、*, and Zhenqiang Chen1、2
Author Affiliations
  • 1Jinan University, Department of Optoelectronic Engineering, Guangzhou, China
  • 2Guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communications, Guangzhou, China
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    Abstract

    Optical superoscillation refers to an intriguing phenomenon of a wave packet that can oscillate locally faster than its highest Fourier component, which potentially produces an extremely localized wave in the far field. It provides an alternative way to overcome the diffraction limit, hence improving the resolution of an optical microscopy system. However, the optical superoscillatory waves are inevitably accompanied by strong side lobes, which limits their fields of view and, hence, potential applications. Here, we report both experimentally and theoretically a new superoscillatory wave form, which not only produces significant feature size down to deep subwavelength, but also completely eliminates side lobes in a particular dimension. We demonstrate a new mechanism for achieving such a wave form based on a pair of moonlike sharp-edge apertures. The resultant superoscillatory wave exhibits Bessel-like forms, hence allowing long-distance propagation of subwavelength structures. The result facilitates the study of optical superoscillation and on a fundamental level eliminates the compromise between the superoscillatory feature size and the field of view.
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    Yanwen Hu, Shiwang Wang, Junhui Jia, Shenhe Fu, Hao Yin, Zhen Li, Zhenqiang Chen. Optical superoscillatory waves without side lobes along a symmetric cut[J]. Advanced Photonics, 2021, 3(4): 045002
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    Category: Letters
    Received: May. 30, 2020
    Accepted: May. 28, 2021
    Posted: May. 31, 2021
    Published Online: Jun. 25, 2021
    The Author Email: Fu Shenhe (fushenhe@jnu.edu.cn), Li Zhen (ailz268@126.com)