Printable Nanocomposite Metalens for High-Contrast Near-Infrared Imaging

Gwanho Yoon, Kwan Kim, Se Um Kim, Seunghoon Han, Heon Lee, Junsuk Rho

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)

Abstract

Printable metalenses composed of a silicon nanocomposite are developed to overcome the manufacturing limitations of conventional metalenses. The nanocomposite is synthesized by dispersing silicon nanoparticles in a thermally printable resin, which not only achieves a high refractive index for high-efficiency metalenses but also printing compatibility for inexpensive manufacturing of metalenses. The synthesized nanocomposite exhibits high refractive index >2.2 in the near-infrared regime, and only 10% uniform volume shrinkage after thermal annealing, so the nanocomposite is appropriate for elaborate nanofabrication compared to commercial high-index printable materials. A 4 mm-diameter metalens operating at the wavelength of 940 nm is fabricated using the nanocomposite and one-step printing without any secondary operations. The fabricated metalens verifies a high focusing efficiency of 47%, which can be further increased by optimizing the composition of the nanocomposite. The printing mold is reusable, so the large-scale metalenses can be printed rapidly and repeatedly. A compact near-infrared camera combined with the nanocomposite metalens is also demonstrated, and an image of the veins underneath human skin is captured to confirm the applicability of the nanocomposite metalens for biomedical imaging.

Original languageEnglish
Pages (from-to)698-706
Number of pages9
JournalACS nano
Volume15
Issue number1
DOIs
Publication statusPublished - 2021 Jan 26

Keywords

  • dielectric metasurface
  • effective medium approximation
  • large-scale nanofabrication
  • near-infrared camera
  • silicon nanoparticle

ASJC Scopus subject areas

  • Materials Science(all)
  • Engineering(all)
  • Physics and Astronomy(all)

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