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Strain-Multiplex Metalens Array for Tunable Focusing and Imaging.

Rajib Ahmed1,2, Haider Butt3

  • 1School of Engineering University of Birmingham Birmingham B15 2TT UK.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|March 1, 2021
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Summary
This summary is machine-generated.

Researchers developed large-scale, cost-effective flexible metalenses using a novel imprinting technique. These reconfigurable diffractive metalenses offer tunable focusing and imaging capabilities through applied strain.

Keywords:
adaptive focusinglenseslight diffractionmetasurfacesnumerical aperture

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Area of Science:

  • Optics and Photonics
  • Materials Science
  • Nanotechnology

Background:

  • Metalenses offer dynamic focusing and zooming by controlling focal length and bandwidth via mechanical stretch.
  • Fabricating large-scale, cost-effective flexible metalenses with high yield remains a significant challenge.

Purpose of the Study:

  • To develop a scalable and cost-effective method for fabricating reconfigurable, flexible metalenses.
  • To demonstrate strain-multiplex tunable focusing capabilities in large-scale flexible metalenses.

Main Methods:

  • Utilized a single-pulsed, maskless light interference and imprinting technique.
  • Engineered metal-dielectric interfaces with metal-coated hemispherical cavities in a hexagonal close-packed arrangement.
  • Applied external stretch to the flexible-template reconfigurable diffractive metalenses (FDMLs) to tune optical properties.

Main Results:

  • Successfully fabricated large-scale, flexible metalenses with tunable focusing capabilities.
  • Demonstrated accurate mapping of focused wavefront, bandwidth, and focal length with applied stretch.
  • Achieved near-unity fill factor (FF ≈ 100%) for enhanced tunable focal length and numerical aperture.

Conclusions:

  • The strain-multiplex approach for flexible diffractive metalenses (FDMLs) enables a new class of large-scale, cost-effective optical devices.
  • This technique provides tunable light focusing and imaging with high performance.
  • Paves the way for advanced applications in flexible imaging systems.