【文献标题】
Super-Oscillation Far-Field Focusing Lens Based on Ultra-Thin Width-Varied Metallic Slit Array
【文献类型】
Article
【作者】
CHEN G, LI YY, WANG XY, WEN ZQ, LIN F, DAI LR, CHEN L, HE YH, LIU S
【ISSN】
1041-1135 EI 1941-0174
【通讯作者地址】
CHONGQING UNIV
【摘要】
A super-oscillation far-field focusing micro-lens based on continuous amplitude modulation is experimentally demonstrated with 40-nm thick width-varied sub-wavelength metallic slit array. The 228 x 200 mu m(2) micro-lens is designed and fabricated with numerical aperture 0.976 and focal length 40.1 lambda for wavelength lambda = 632.8 nm. Experimental results show that the focal length is similar to 26.5 +/- 1 mu m, and the focal line full width at half maximum is 0.379 lambda, which is smaller than the corresponding diffraction limit 0.512 lambda and the super-oscillation criterion 0.389 lambda. A great suppression of sidelobes was observed in the measured focal plane area, and the largest sidelobe intensity was found only 10.6% of the central lobe intensity, leading to a wide field of view.
【被引次数】
3
【DOI】
10.1109/LPT.2015.2496148
【出版日期】
2016
【卷】
28
【研究方向】
ENGINEERING
OPTICS
PHYSICS

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