Journal
NANO LETTERS
Volume 18, Issue 11, Pages 6961-6966Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.8b02875
Keywords
van der Waals nanophotonics; ultrathin dielectric metalens; integrable metalens; tunable metalens; incomplete phase design
Categories
Funding
- AFOSR [FA9550-18-1-0104]
- NSF MRSEC [1719797]
- Ministry of Science and Technology of Taiwan [MOST 107-2112-M-007-002-MY3]
- National Science Foundation [0335765, 1337840]
- Washington Research Foundation
- M. J. Murdock Charitable Trust
- GCE Market
- Class One Technologies
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Ultrathin and flat optical lenses are essential for modern optical imaging, spectroscopy, and energy harvesting. Dielectric metasurfaces comprising nanoscale quasi-periodic resonator arrays are promising for such applications, as they can tailor the phase, amplitude, and polarization of light at subwavelength resolution, enabling multifunctional optical elements. To achieve 2 pi phase coverage, however, most dielectric metalenses need a thickness comparable to the wavelength, requiring the fabrication of high-aspect-ratio scattering elements. We report ultrathin dielectric metalenses made of van der Waals (vdW) materials, leveraging their high refractive indices and the incomplete phase design approach to achieve device thicknesses down to similar to lambda/10, operating at infrared and visible wavelengths. These materials have generated strong interest in recent years due to their advantageous optoelectronic properties. Using vdW metalenses, we demonstrate near diffraction - limited focusing and imaging and exploit their layered nature to transfer the fabricated metalenses onto flexible substrates to show strain-induced tunable focusing. Our work enables further downscaling of optical elements and opportunities for the integration of metasurface optics in ultraminiature optoelectronic systems.
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