[1] Veselago V G. The electrodynamics of substances with simultaneously negative values of ε and μ[J]. Soviet Physics Uspekhi, 10, 509-514(1968). http://adsabs.harvard.edu/abs/1968SvPhU..10..509V

[2] Pendry J B. Negative refraction makes a perfect lens[J]. Physical Review Letters, 85, 3966-3969(2000). http://europepmc.org/abstract/med/11041972

[3] Kang M, Chen J, Li S M. et al. Optical spin-dependent angular shift in structured metamaterials[J]. Optics Letters, 36, 3942-3944(2011). http://www.ncbi.nlm.nih.gov/pubmed/21964149

[4] John S. Strong localization of photons in certain disordered dielectric superlattices[J]. Physical Review Letters, 58, 2486-2489(1987). http://prola.aps.org/abstract/PRL/v58/i23/p2486_1

[5] Yablonovitch G, Sheng P, Yablonovitch E et al. Inhibited spontaneous emission in solid-state physics and electronics[J]. Physical Review Letters, 58, 2059-2061(1987). http://onlinelibrary.wiley.com/resolve/reference/PMED?id=10034639

[6] Su K, Wang Z M, Liu J J. Three waveguides directional coupler based on two dimensional square lattice photonic crystal[J]. Acta optica Sinica, 36, 0323002(2016).

[7] Zhang X X, Chen H M. Design and performance analysis of photonic crystal polarizing beam splitter[J]. Laser & Optoelectronics Progress, 54, 011301(2017).

[8] Ma J, Yu H H, Xiong J G et al. Research progress of photonic crystal fiber sensors[J]. Laser & Optoelectronics Progress, 54, 070006(2017).

[9] Cubukcu E, Aydin K, Ozbay E et al. Electromagnetic waves: negative refraction by photonic crystals[J]. Nature, 423, 604-605(2003). http://www.ncbi.nlm.nih.gov/pubmed/12789328

[10] Parimi P V, Lu W T, Vodo P et al. Photonic crystals: imaging by flat lens using negative refraction[J]. Nature, 426, 404(2003). http://www.nature.com/nature/journal/v426/n6965/abs/426404a.html

[11] Liu F F, Zhu Z J, Tong Y W. Effects on imaging quality of defects in the photonic crystal with negative refraction material[J]. Acta Optica Sinica, 35, 0416004(2015).

[12] Luo C, Johnson S G, Joannopoulos J D et al. Subwavelength imaging in photonic crystals[J]. Physical Review B, 68, 045115(2003). http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=PRBMDO000068000004045115000001&idtype=cvips&gifs=Yes

[13] Petráň M. Hadravsk M, Egger M D, et al. Tandem-scanning reflected light microscope [J]. Journal of the Optical Society of America, 58, 661-664(1968).

[14] Kuang C F, Li S, Liu W et al. Breaking the diffraction barrier using fluorescence emission difference microscopy[J]. Scientific Reports, 3, 1441(2013). http://www.ncbi.nlm.nih.gov/pubmed/23486546

[15] Willig KI, Harke B, Medda R et al. STED microscopy with continuous wave beams[J]. Nature Methods, 4, 915-918(2007). http://www.biomedcentral.com/pubmed/17952088

[16] Zhao G, Kabir M M, Toussaint K C et al. Saturated absorption competition microscopy[J]. Optica, 4, 633-636(2017).

[17] Rong Z H, Li S, Kuang C F. et al. Real-time super-resolution imaging by high-speed fluorescence emission difference microscopy[J]. Journal of Modern Optics, 61, 1364-1371(2014). http://www.tandfonline.com/doi/full/10.1080/09500340.2014.933272

[18] Wilson T. Resolution and optical sectioning in the confocal microscope[J]. Journal of Microscopy, 244, 113-121(2011). http://europepmc.org/abstract/MED/22004276

[19] Sun T X, Liu H H, Liu Z G et al. Application of confocal micro X-ray fluorescence technique based on polycapillary X-ray lens in analyzing medicine with capsule[J]. Acta Optica Sinica, 34, 0134001(2014).

[20] Borlinghaus R T, Kappel C. HyVolution: the smart path to confocal super-resolution[J]. Nature Methods, 13, 276(2016). http://www.nature.com/articles/nmeth.f.392