Ultrathin Broadband Metasurface Superabsorbers from a van der Waals Semimetal

Adam D. Alfieri, Michael J. Motala, Michael Snure, Jason Lynch, Pawan Kumar, Huiqin Zhang, Susanna Post, Timothy Bowen, Christopher Muratore, Joshua A. Robinson, Joshua R. Hendrickson, Nicholas R. Glavin, Deep Jariwala

Research output: Contribution to journalArticlepeer-review

6 Scopus citations


Metamaterials and metasurfaces operating in the visible and near-infrared (NIR) offer a promising route towards next-generation photodetectors and devices for solar energy harvesting. While numerous metamaterials and metasurfaces using metals and semiconductors have been demonstrated, semimetals-based metasurfaces in the vis-NIR range are notably missing. This work experimentally demonstrates a broadband metasurface superabsorber based on large area, semimetallic, van der Waals platinum diselenide (PtSe2) thin films in agreement with electromagnetic simulations. The results show that PtSe2 is an ultrathin and scalable semimetal that concurrently possesses high index and high extinction across the vis-NIR range. Consequently, the thin-film PtSe2 on a reflector separated by a dielectric spacer can absorb >85% for the unpatterned case and ≈97% for the optimized 2D metasurface in the 400–900 nm range making it one of the strongest and thinnest broadband perfect absorbers to date. The results present a scalable approach to photodetection and solar energy harvesting, demonstrating the practical utility of high index, high extinction semimetals for nanoscale optics.

Original languageEnglish (US)
Article number2202011
JournalAdvanced Optical Materials
Issue number4
StatePublished - Feb 17 2023

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics


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