期刊
SCIENTIFIC REPORTS
卷 6, 期 -, 页码 -出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/srep37776
关键词
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资金
- China National Key Basic Research and Development Program [2013CBA01700]
- China National Natural Science Foundation [61575031, 61177093]
- Program for New Century Excellent Talent in University [NCET-13-0629]
- Scientific Research Foundation for the Returned Overseas Chinese Scholars, State Education Ministry
- Fundamental Research Funds for the Central Universities [106112013CDJZR120019, 106112016CDJZR125503, 106112015CDJXY120012]
- Chongqing advanced and applied basic research project [cstc2015jcyjA40020]
The generation of a sub-diffraction optical hollow ring is of great interest in various applications, such as optical microscopy, optical tweezers, and nanolithography. Azimuthally polarized light is a good candidate for creating an optical hollow ring structure. Various of methods have been proposed theoretically for generation of sub-wavelength hollow ring by focusing azimuthally polarized light, but without experimental demonstrations, especially for sub-diffraction focusing. Super-oscillation is a promising approach for shaping sub-diffraction optical focusing. In this paper, a planar sub-diffraction diffractive lens is proposed, which has an ultra-long focal length of 600 lambda and small numerical aperture of 0.64. A sub-diffraction hollow ring is experimentally created by shaping an azimuthally polarized wave. The full-width-at-half-maximum of the hollow ring is 0.61 lambda, which is smaller than the lens diffraction limit 0.78 lambda, and the observed largest sidelobe intensity is only 10% of the peak intensity.
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