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题名:
Shaping a Subwavelength Needle with Ultra-long Focal Length by Focusing Azimuthally Polarized Light
作者: Qin, Fei; Huang, Kun; Wu, Jianfeng; Jiao, Jiao; Luo, Xiangang; Qiu, Chengwei; Hong, Minghui
刊名: SCIENTIFIC REPORTS
出版日期: 2015
卷号: 5, 页码:9977
学科分类: SUPER-OSCILLATORY LENS; CYLINDRICAL-VECTOR BEAMS; DIFFRACTION LIMIT; STOKES PARAMETERS; BINARY OPTICS; PHASE; WAVELENGTHS; FIELDS
DOI: 10.1038/srep09977
文章类型: 期刊论文
中文摘要: Flat optics, which could planarize and miniaturize the traditional optical elements, possesses the features of extremely low profile and high integration for advanced manipulation of light. Here we proposed and experimentally demonstrated a planar metalens to realize an ultra-long focal length of -240 lambda with a large depth of focus (DOF) of -12 lambda, under the illumination of azimuthally polarized beam with vortical phase at 633 nm. Equally important is that such a flat lens could stably keep a lateral subwavelength width of 0.42 lambda to 0.49 lambda along the needle-like focal region. It exhibits one-order improvement in the focal length compared to the traditional focal lengths of 20-30 lambda of flat lens, under the criterion of having subwavelength focusing spot. The ultra-long focal length ensures sufficient space for subsequent characterization behind the lens in practical industry setups, while subwavelength cross section and large DOF enable high resolution in transverse imaging and nanolithography and high tolerance in axial positioning in the meantime. Such planar metalens with those simultaneous advantages is prepared by laser pattern generator rather than focused ion beam, which makes the mass production possible.
英文摘要: Flat optics, which could planarize and miniaturize the traditional optical elements, possesses the features of extremely low profile and high integration for advanced manipulation of light. Here we proposed and experimentally demonstrated a planar metalens to realize an ultra-long focal length of -240 lambda with a large depth of focus (DOF) of -12 lambda, under the illumination of azimuthally polarized beam with vortical phase at 633 nm. Equally important is that such a flat lens could stably keep a lateral subwavelength width of 0.42 lambda to 0.49 lambda along the needle-like focal region. It exhibits one-order improvement in the focal length compared to the traditional focal lengths of 20-30 lambda of flat lens, under the criterion of having subwavelength focusing spot. The ultra-long focal length ensures sufficient space for subsequent characterization behind the lens in practical industry setups, while subwavelength cross section and large DOF enable high resolution in transverse imaging and nanolithography and high tolerance in axial positioning in the meantime. Such planar metalens with those simultaneous advantages is prepared by laser pattern generator rather than focused ion beam, which makes the mass production possible.
收录类别: SCI
项目资助者: National Research Foundation, Prime Minister's Office, Singapore [NRF-CRP10-2012-04] ; State Key Program of National Natural Science of China [61138002] ; 973 Program of China [2013CBA01700]
语种: 英语
WOS记录号: WOS:000354089500001
ISSN号: 2045-2322
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.ioe.ac.cn/handle/181551/6885
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Recommended Citation:
Qin, Fei,Huang, Kun,Wu, Jianfeng,et al. Shaping a Subwavelength Needle with Ultra-long Focal Length by Focusing Azimuthally Polarized Light[J]. SCIENTIFIC REPORTS,2015,5:9977.
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