Journal
SCIENTIFIC REPORTS
Volume 7, Issue -, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/s41598-017-13004-z
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Funding
- State Key Program for Basic Research of China [2017YFA0205801]
- National Natural Science Foundation of China [61705249, 11334008, 61290301]
- Fund of Shanghai Science and Technology Foundation [16JC1400400, 16JC1400404, 16ZR1445300]
- Shanghai Sailing Program [16YF1413200]
- Youth Innovation Promotion Association CAS [2017285]
- Chinese Academy of Sciences [QYZDJ-SSW-JSC007]
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We propose an ultra-thin planar reflective metalens with sub-diffraction-limited and multifunctional focusing. Based on the equal optical path principle, the specific phase distributions for multifunction focusing are derived. Following the formulas, on-center focusing with the characteristics of sub-diffraction-limited, high focusing efficiency (85%) and broadband focusing is investigated in detail. To demonstrate the flexibility of the reflective metalens, off-center and dual spots focusing (at the horizontal and longitudinal directions) are demonstrated. Note that all these focusings are sub-diffraction-limited due to the evanescent-filed enhancement mechanism in our elaborately designed structure. The designed reflective metalens will find important applications in super-resolution imaging, microscopes, and spectroscopic designs.
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