Perfect Absorption and Strong Coupling in Supported MoS2 Multilayers
Artikel i vetenskaplig tidskrift, 2023

Perfect absorption and strong coupling are two highly sought-after regimes of light-matter interactions. Both regimes have been studied as separate phenomena in excitonic 2D materials, particularly in MoS2. However, the structures used to reach these regimes often require intricate nanofabrication. Here, we demonstrate the occurrence of perfect absorption and strong coupling in thin MoS2 multilayers supported by a glass substrate. We measure reflection spectra of mechanically exfoliated MoS2 flakes at various angles beyond the light-line via Fourier plane imaging and spectroscopy and find that absorption in MoS2 monolayers increases up to 74% at the C-exciton by illuminating at the critical angle. Perfect absorption is achieved for ultrathin MoS2 flakes (4-8 layers) with a notable angle and frequency sensitivity to the exact number of layers. By calculating zeros and poles of the scattering matrix in the complex frequency plane, we identify perfect absorption (zeros) and strong coupling (poles) conditions for thin (<10 layers) and thick (>10 layers) limits. Our findings reveal rich physics of light-matter interactions in bare MoS2 flakes, which could be useful for nanophotonic and light harvesting applications.

ultrathin films

strong coupling


Fourier plane spectroscopy


perfect absorption



Adriana Canales Ramos

Chalmers, Fysik, Nano- och biofysik

Oleg Kotov

Chalmers, Fysik, Nano- och biofysik

Timur Shegai

Chalmers, Fysik, Nano- och biofysik

ACS Nano

1936-0851 (ISSN) 1936-086X (eISSN)

Vol. 17 4 3401-3411


Atom- och molekylfysik och optik

Annan fysik

Den kondenserade materiens fysik





Mer information

Senast uppdaterat