High efficiency near diffraction-limited mid-infrared flat lenses based on metasurface reflectarrays

Abstract

A limiting factor in the development of mid-infrared optics is the lack of abundant materials that are transparent, low cost, lightweight, and easy to machine. In this paper, we demonstrate a metasurface device that circumvents these limitations. A flat lens based on antenna reflectarrays was designed to achieve near diffraction-limited focusing with a high efficiency (experiment: 80%, simulation: 83%) at 45(o) incidence angle at λ = 4.6 μm. This geometry considerably simplifies the experimental arrangement compared to the common geometry of normal incidence which requires beam splitters. Simulations show that the effect of comatic aberrations is small compared to parabolic mirrors. The use of single-step photolithography allows large scale fabrication.

9 pages

References in corpus (7)

• Aberration-free ultra-thin flat lenses and axicons at telecom wavelengths based on plasmonic metasurfaces
• Mid-infrared frequency combs
• Subwavelength-thick Lenses with High Numerical Apertures and Large Efficiency Based on High Contrast Transmitarrays
• Multiwavelength Achromatic Metasurfaces by Dispersive Phase Compensation
• Flat Dielectric Grating Reflectors with High Focusing Power
• Ultrathin Terahertz Planar Lenses
• Efficient Dielectric Metasurface Collimating Lenses for Mid-Infrared Quantum Cascade Lasers

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• Solid-Immersion Metalenses for Infrared Focal Plane Arrays
• Nonlinear Mid-infrared Metasurface based on a Phase-Change Material
• Multifunctional Metamirrors Involving Simultaneous Linear-polarization Conversion and Focusing