A broadband multi-focus lens based on metasurface holography in the far-infrared region is designed. By designing 8 C-shaped resonant rings, when linearly polarized light waves are incident normally to this set of resonators, cross-polarized component of transmitted light will form the phase shift from 0 to 2π, meanwhile the amplitude transmittance remains constant. Full-wave simulation was utilized to verify anomalous refraction properties when linearly polarized light waves irradiated this set of resonators vertically. The phase distribution of multi-focus lens was obtained by adopting the computer-generated hologram (CGH) method. According to arranged resonant rings based on the calculated phase distribution, a squared multi-focus lens based on metasurface was obtained. Simulation for the designed lens was conducted. Results show a good multi-focusing performance at the central frequency 28 THz in the focal length of 108 μm.
Multi-focus lens based on metasurface holography
First published at:Jul 15, 2017
Opto-Electronic Engineering Vol. 44, Issue 07, pp. 670 - 675 (2017) DOI:10.3969/j.issn.1003-501X.2017.07.002
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Get Citation: Jia Yuxuan, Fan Qi, Wang Yunfei. Multi-focus lens based on metasurface holography[J]. Opto-Electronic Engineering, 2017, 44(7): 670–675.
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