Varifocal zoom imaging with large area focal length adjustable metalenses
By Shane Colburn, A. Zhan, Arka Majumdar. Optica, 2018
144 citations recorded by the source corpus.
Varifocal lenses are essential components of dynamic optical systems with applications in photography, mixed reality, and microscopy. Metasurface optics has strong potential for creating tunable flat optics. Existing tunable metalenses, however, typically require microelectromechanical actuators, which cannot be scaled to large area devices, or rely on high voltages to stretch a flexible substrate and achieve a sufficient tuning range. Here, we build a 1 cm aperture varifocal metalens system at 1550 nm wavelength inspired by an Alvarez lens, fabricated using high-throughput stepper photolithography. We demonstrate a nonlinear change in focal length by minimally actuating two cubic phase metasurfaces laterally, with focusing efficiency as high as 57% and a wide focal length change of more than 6 cm (>200%). We also test a lens design at visible wavelength and conduct varifocal zoom imaging with a demonstrated 4× zoom capability without any other optical elements in the imaging path.
Subfields: Aerospace Engineering, Electronic, Optical and Magnetic Materials, Mechanical Engineering
View Paper: https://www.semanticscholar.org/paper/3d4a79aceb7914328966bd8eef1c184a8676a90f
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In Electronic, Optical and Magnetic Materials
Citations in the corpus
- Imaging based on metalenses (2020, methodology): “(b) Schematic representation of the designed tunable metalens system comprising two cubic metasurface phase plates actuated laterally [73].”
- Reconfigurable metasurfaces towards commercial success (2022, background): “…Stark effect 11 , thermo-optic coupling 12 , electrochromism 13 , magneto-optical interaction 14 , and structural transitions in various materials 15 – 18 , whereas the latter can leverage either macroscopic displacement 19 /deformation 20 or micro-electromechanical system (MEMS) actuation 21 (Fig.”
- Tunable metasurfaces towards versatile metalenses and metaholograms: a review (2022, background): “(d) Schematic view of a tunable metalenses system that consists of two cubic metasurfaces.(98) (e) Schematic”