| Title | Beam focusing by tapered metallic nano-slits |
| Authors | Miao, Junjie Wang, Yongsheng Guo, Chuan Fei Tian, Ye Zhang, Jianming Liu, Qian Zhou, Zhiping |
| Affiliation | National Center for Nanoscience and Technology, No. 11, Beiyitiao, Beijing 100190, China Academy for Advanced Interdisciplinary Studies, Peking University, Beijing 100871, China Graduate School of the Chinese Academy of Sciences, Beijing 100190, China Institute of Microelectronics, Tsinghua University, Beijing 100084, China |
| Issue Date | 2013 |
| Citation | 2013,13(2),1026-1029. |
| Abstract | In this study, we discussed the influence of tapered metallic subwavelength slit array with variant width of slits on beam focus properties. In order to analyze the phenomenon, a finite-difference timedomain numerical algorithm and phase matching theory were adopted for computational numerical simulation of the nano-structures. The structures were flanked with the penetrated slits through a metal film coated on a quartz substrate. We found that the phase delay of each slit will grow with the decrease of slit width. Optical transmission of each slit can be adjusted by using an optimum choice of the taper angle, taper slit width and the wavelength of incident light. So by optimizing the slit width of the input and output apertures, the trapezoidal slit array can show focusing property. The focal width and focal intensity can be controlled effectively by regulating the aperture width of slits. These results are very encouraging for further study on nano-optics and the applied planar lenses. Copyright ? 2013 American Scientific Publishers All rights reserved. |
| URI | http://hdl.handle.net/20.500.11897/461386 |
| DOI | 10.1166/jnn.2013.6107 |
| Indexed | EI |
| Appears in Collections: | 前沿交叉学科研究院 |
