[1] Xu H F, Zhang W J, Qu J et al. Optical trapping Rayleigh dielectric particles with focused partially coherent dark hollow beams[J]. Journal of Modern Optics, 62, 1839-1848(2015). http://www.tandfonline.com/doi/full/10.1080/09500340.2015.1045947

[2] Kuga T, Torii Y, Shiokawa N et al. Novel optical trap of atoms with a doughnut beam[J]. Physical Review Letters, 78, 4713-4716(1997). http://adsabs.harvard.edu/abs/1997PhRvL..78.4713K

[3] Liu H L, Lü Y F, Xia J et al. Flat-topped vortex hollow beam and its propagation properties[J]. Journal of Optics, 17, 075606(2015). http://www.ingentaconnect.com/content/iop/jopt2/2015/00000017/00000007/art075606

[4] Khonina S N, Golub I. Engineering the smallest 3D symmetrical bright and dark focal spots[J]. Journal of the Optical Society of America A, 30, 2029-2033(2013). http://www.ncbi.nlm.nih.gov/pubmed/24322859

[5] Liu S L, Liu W, Chen D N et al. Generation of dark hollow beams used in sub-diffraction-limit imaging in coherent anti-Stokes Raman scattering microscopy[J]. Acta Physica Sinica, 63, 214601(2014).

[6] Peng F, Yao B L, Yan S H et al. Trapping of low-refractive-index particles with azimuthally polarized beam[J]. Journal of the Optical Society of America B, 26, 2242-2247(2009). http://www.opticsinfobase.org/abstract.cfm?URI=josab-26-12-2242

[7] Xue Y, Kuang C F, Li S et al. Sharper fluorescent super-resolution spot generated by azimuthally polarized beam in STED microscopy[J]. Optics Express, 20, 17653-17666(2012). http://www.opticsinfobase.org/abstract.cfm?URI=oe-20-16-17653

[8] Lin J H, Wei M D, Liang H H et al. Generation of supercontinuum bottle beam using an axicon[J]. Optics Express, 15, 2940-2946(2007). http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=VIRT02000013000007000162000001&idtype=cvips&gifs=Yes

[9] Chen Y H, Yan L, Rishøj L et al. Dynamically tunable optical bottles from an optical fiber[J]. Optics Letters, 37, 3327-3329(2012). http://www.opticsinfobase.org/abstract.cfm?URI=ol-37-16-3327

[10] Zeng T T, Ding J P. Three-dimensional multiple optical cages formed by focusing double-ring shaped radially and azimuthally polarized beams[J]. Chinese Optics Letters, 16, 031405(2018). http://www.opticsjournal.net/Articles/Abstract?aid=OJ180315000083y6B8Ea

[11] Wang H F, Gan F X. Phase-shifting apodizers for increasing focal depth[J]. Applied Optics, 41, 5263-5266(2002). http://europepmc.org/abstract/med/12211552

[12] Chen G J, Zhou Q Q, Ji X M et al. Generation of the tunable vector ellipse hollow beam by using linearly polarized light beams[J]. Acta Physica Sinica, 63, 083701(2014).

[13] Lin J, Chen R, Yu H C et al. Generation of hollow beam with radially polarized vortex beam and complex amplitude filter[J]. Journal of the Optical Society of America A, 31, 1395-1400(2014).

[14] Chen G J, Zhou Q Q, Ji X M et al. Study on high-numerical-aperture-focused characteristics of vector beam produced by π phase plate[J]. Acta Optica Sinica, 34, 1226001(2014).

[15] de Juana D M, Oti J E, Canales V F et al. . Design of superresolving continuous phase filters[J]. Optics Letters, 28, 607-609(2003).

[16] Cai X M, Zhao J Y, Tong H et al. Study on high-numerical-aperture-focused characteristics by π phase diaphragm modulation[J]. Acta Optica Sinica, 37, 0526001(2017).

[17] Sales T R M, Morris G M. Diffractive superresolution elements[J]. Journal of the Optical Society of America A, 14, 1637-1646(1997).

[18] Bokor N, Davidson N. Tight parabolic dark spot with high numerical aperture focusing with a circular π phase plate[J]. Optics Communications, 270, 145-150(2007).

[19] Zhou C H, Jia J, Liu L R. Circular Dammann grating[J]. Optics Letters, 28, 2174-2176(2003).