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RESEARCH PRODUCT
Achromatic Varifocal Metalens for the Visible Spectrum
Maxwell D. AielloJanis SmitsJanis SmitsAdam S. BackerAdam S. BackerVictor M. AcostaPatrick LlullAryeh J. SaponJohn D. Perreaultsubject
Materials scienceNanophotonicsFOS: Physical sciencesPhysics::OpticsApplied Physics (physics.app-ph)02 engineering and technologyStereo display01 natural scienceslaw.invention010309 opticsOpticslawMesoscale and Nanoscale Physics (cond-mat.mes-hall)0103 physical sciencesElectrical and Electronic EngineeringPhysicsCondensed Matter - Materials ScienceCondensed Matter - Mesoscale and Nanoscale Physicsbusiness.industryMaterials Science (cond-mat.mtrl-sci)Physics - Applied Physics021001 nanoscience & nanotechnologyAtomic and Molecular Physics and OpticsElectronic Optical and Magnetic MaterialsAchromatic lens0210 nano-technologybusinessOptics (physics.optics)Physics - OpticsBiotechnologyVisible spectrumdescription
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 length of a 40 micrometer-diameter metalens is tuned from 220-550 micrometers with nearly diffraction-limited performance. We show that imparting a wavelength-dependent polarization rotation on incident light enables achromatic focusing over a wide band of the visible spectrum, 483-620 nm. We use this property to demonstrate varifocal color imaging with white light from a halogen source. Tunable achromatic metalenses may be useful for applications in imaging and display.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2019-03-10 | Frontiers in Optics + Laser Science APS/DLS |