Polarization-independent longitudinal multi-focusing metalens

0103 physical sciences 02 engineering and technology 0210 nano-technology 01 natural sciences 3. Good health
DOI: 10.1364/oe.23.029855 Publication Date: 2015-11-05T16:47:32Z
ABSTRACT
A novel multi-focusing metalens in the longitudinal direction has been proposed and investigated based on the equal optical path principle, which is independent on the incident polarizations and can be suitable for both of the linear and circular polarization incidences simultaneously. Here, three novel designing principles: partitioned mode, radial alternating mode and angular alternating mode, have been proposed firstly for constructing different types of the longitudinal multi-focusing metalenses. The performances of the designed metalenses based on the different designed methods have also been analyzed and investigated in detail, and the intensity ratio of the focusing spots can be tuned easily by modulating the numbers of the relative type of nanoantennas, which is significant for the micro-manipulating optics and the multi-imaging technology in the integrated optics.
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