High-Quality Infrared Metalenses Based on Germanium Dimers

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Abstract

Modern methods of nanophotonics allow creating miniature devices that change the direction of light propagation, modulate the phase front, and control the outcoming state of the polarization. One of the promising areas of research is the development of flat optics elements based on planar analogues of metamaterials—dielectric metasurfaces, which are two-dimensional arrays of subwavelength nanoparticles with a high refractive index and low absorption coefficient. However, the resonances of such nanoscatterers have usually a low quality factor. Symmetry breaking of particle can lead to the excitation of a high-Q quasi-bound states in the continuum. In this work, we numerically study infrared metasurfaces that support such resonances and are formed by dimers of germanium nanocuboids. The possibility of focusing radiation to a point and line by 300‑nm-thick spherical and cylindrical metalenses is shown.

About the authors

V. M Pustynnikova

Faculty of Physics, Moscow State University, 119991, Moscow, Russia

Email: fedyanin@nanolab.phys.msu.ru

A. I Musorin

Faculty of Physics, Moscow State University, 119991, Moscow, Russia

Email: fedyanin@nanolab.phys.msu.ru

A. A Fedyanin

Faculty of Physics, Moscow State University, 119991, Moscow, Russia

Author for correspondence.
Email: fedyanin@nanolab.phys.msu.ru

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