Ultrathin Broadband Metasurface Superabsorbers from a van der Waals Semimetal
Abstract
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.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Dec 11, 2022
- Source ID
- 10.1002/adom.202202011
Entities
People
- Adam Alfieri
- Christopher Muratore
- Deep Jariwala
- Huiqin Zhang
- Jason Lynch
- Joshua A. Robinson
- Joshua R Hendrickson
- Michael J. Motala
- Michael Snure
- Nicholas R Glavin
- Pawan Kumar
- Susanna Post
- Timothy Bowen
Organizations
- Air Force Office of Scientific Research
- Air Force Research Laboratory
- National Science Foundation
- Pennsylvania State University
- University of Dayton
- University of Pennsylvania