Ultrathin transmissive metasurfaces for multi-wavelength optics in the visible

Haogang Cai, David Czaplewski, Karim Ogando, Alex Martinson, David Gosztola, Liliana Stan, Daniel López

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

Metasurface-based optical elements have the ability to shape wavefronts by locally changing the properties of incident illumination. They hold great potential to promote a new generation of wearable devices and thin optical systems for imaging and sensing. However, due to the diffractive nature of these metasurfaces, chromatic aberration represents a critical challenge toward practical implementations, especially for the visible spectrum. Existing solutions for multi-wavelength meta-optics inevitably increase the device thickness and system complexity, similar to the conventional refractive and diffractive counterparts. They are also limited to polarization sensitive lenses with a small size and numerical aperture (NA). In this manuscript, we present the design of single-layer multi-wavelength metasurfaces using ultrathin dielectric resonators (thickness wavelength) as structural elements. The electromagnetic response of these resonators can be tailored by the in-plane geometrical parameters and used to manipulate the transmitted light. We introduce a digital transmission modulation scheme which enables opportunities to design multi-wavelength optics beyond conventional binary diffractive optics. The design versatility of our approach is demonstrated by polarization-independent achromatic metalenses with a larger lens size and larger NA than existing approaches. The simplicity of the design and fabrication process makes these ultrathin metasurfaces good candidates for building flat optical elements that can be easily integrated onto CMOS electronics and MEMS devices.

Original languageEnglish (US)
Article number071106
JournalApplied Physics Letters
Volume114
Issue number7
DOIs
StatePublished - Feb 18 2019

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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