Metalens for energy backflow

Sergey S. Stafeev; Anton G. Nalimov; Victor V. Kotlyar; Liam O’Faolain; Maria V. Kotlyar

doi:10.1117/12.2593241

22 June 2021 Metalens for energy backflow

Sergey S. Stafeev, Anton G. Nalimov, Victor V. Kotlyar, Liam O’Faolain, Maria V. Kotlyar

Proceedings Volume 11793, Optical Technologies for Telecommunications 2020; 117930T (2021) https://doi.org/10.1117/12.2593241
Event: Eighteenth International Scientific and Technical Conference "Optical Technologies for Communications", 2020, Samara, Russian Federation

Abstract

Using electronic beam lithography and ion etching we manufactured a metalens with diameter 30 μm, focal length 633 nm and relief depth of 130 nm. The metalens consists from 16 sector subwavelength binary gratings with period 220 nm. The proposed metalens generates a left-hand circularly polarized optical vortex with topological charge 2 when it is illuminated by left-hand circularly polarized light; however, it generates a cylindrical vector beam of the second order when it is illuminated by linearly polarized light. In both cases a region of inverse energy flow occurs in the focal spot.

Citation Download Citation

Sergey S. Stafeev, Anton G. Nalimov, Victor V. Kotlyar, Liam O’Faolain, and Maria V. Kotlyar "Metalens for energy backflow", Proc. SPIE 11793, Optical Technologies for Telecommunications 2020, 117930T (22 June 2021); https://doi.org/10.1117/12.2593241

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