Journal
SCIENTIFIC REPORTS
Volume 6, Issue -, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/srep38859
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Funding
- 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]
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The generation of a sub-diffraction longitudinally polarized spot is of great interest in various applications, such as optical tweezers, super-resolution microscopy, high-resolution Raman spectroscopy, and high-density optical data storage. Many theoretical investigations have been conducted into the tight focusing of a longitudinally polarized spot with high-numerical-aperture aplanatic lenses in combination with optical filters. Optical super-oscillation provides a new approach to focusing light beyond the diffraction limit. Here, we propose a planar binary phase lens and experimentally demonstrate the generation of a longitudinally polarized sub-diffraction focal spot by focusing radially polarized light. The lens has a numerical aperture of 0.93 and a long focal length of 200 lambda for wavelength lambda = 632.8 nm, and the generated focal spot has a full-width-at-half-maximum of about 0.456 lambda, which is smaller than the diffraction limit, 0.54 lambda. A 5 lambda-long longitudinally polarized optical needle with sub-diffraction size is also observed near the designed focal point.
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