Achromatic Varifocal Metalens for the Visible Spectrum

@article{Aiello2019AchromaticVM,
  title={Achromatic Varifocal Metalens for the Visible Spectrum},
  author={Maxwell D. Aiello and Adam S. Backer and Aryeh J. Sapon and Janis Smits and John D. Perreault and Patrick Llull and Victor M. Acosta},
  journal={ACS Photonics},
  year={2019}
}
Metasurface optics provide an ultra-thin alternative to conventional refractive lenses. A present challenge is in realizing metasurfaces that exhibit tunable optical properties and achromatic behavior across the visible spectrum. Here, we report the design, fabrication, and characterization of metasurface lenses ("metalenses") that use asymmetric TiO2 nanostructures to induce a polarization-dependent optical response. By rotating the polarization of linearly-polarized input light, the focal… 

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References

SHOWING 1-10 OF 72 REFERENCES

A broadband achromatic metalens in the visible

Integrating the Pancharatnam–Berry phase with integrated resonant nanoantennas in a metalens design produces an achromatic device capable of full-colour imaging in the visible range in transmission mode.

Broadband achromatic dielectric metalenses

This work developed a design methodology and created libraries of meta-units—building blocks of metasurfaces—with complex cross-sectional geometries to provide diverse phase dispersions (phase as a function of wavelength), which is crucial for creating broadband achromatic metalenses.

A broadband achromatic metalens for focusing and imaging in the visible

It is shown that by judicious design of nanofins on a surface, it is possible to simultaneously control the phase, group delay and group delay dispersion of light, thereby achieving a transmissive achromatic metalens with large bandwidth.

A broadband achromatic polarization-insensitive metalens consisting of anisotropic nanostructures

A polarization-insensitive metalens is demonstrated using otherwise anisotropic nanofins which offer additional control over the dispersion and phase of the output light, allowing achromatic and polarization- insensitive behaviour across the entire visible spectrum.

High efficiency double-wavelength dielectric metasurface lenses with dichroic birefringent meta-atoms.

A double-wavelength metasurface based on polarization dependent dielectric meta-atoms that control the phases of two orthogonal polarizations independently is proposed and demonstrated.

High efficiency dielectric metasurfaces at visible wavelengths

Metasurfaces are planar optical elements that hold promise for overcoming the limitations of refractive and conventional diffractive optics 1-3 . Dielectric metasurfaces demonstrated thus far 4-10

Subwavelength-thick lenses with high numerical apertures and large efficiency based on high-contrast transmitarrays.

P polarization-insensitive, micron-thick, high-contrast transmitarray micro-lenses with focal spots as small as 0.57 λ are reported, thus enabling widespread adoption and a rigorous method for ultrathin lens design is discussed.

Metalenses at visible wavelengths: Diffraction-limited focusing and subwavelength resolution imaging

The results firmly establish that metalenses can have widespread applications in laser-based microscopy, imaging, and spectroscopy, with image qualities comparable to a state-of-the-art commercial objective.

Metasurface Freeform Nanophotonics

The adaptation of freeform optics to a sub-wavelength metasurface platform allows for further miniaturization of optical components and offers a scalable route toward implementing near-arbitrary geometric curvatures in nanophotonics.

Highly tunable elastic dielectric metasurface lenses

Dielectric metasurfaces are two‐dimensional structures composed of nano‐scatterers that manipulate the phase and polarization of optical waves with subwavelength spatial resolution, thus enabling
...