• Corpus ID: 249062997

Plasmonics enabled atomically thin linearly polarized emitter at room temperature

@inproceedings{Roy2022PlasmonicsEA,
  title={Plasmonics enabled atomically thin linearly polarized emitter at room temperature},
  author={Bidisha Roy and Maex Blauth and Siddharth Dhomkar and Michael Kaniber and Vinod M. Menon and Jonathan J. Finley},
  year={2022}
}

• B. Roy, Maex Blauth, +3 authors J. Finley
• Published 25 May 2022
• Physics

Two-dimensional transition metal di-chalcogenide semiconductors provide unique possibil-ities to investigate strongly confined excitonic physics and a plasmonic platform integrable to such materials constitutes a hybrid system that can be of interest to enable manipulation of their cumulative optical properties. Here we report tuning of excitonic emission from monolayer WSe 2 , mechanically exfoliated on top of a periodic two dimensional plasmonic array of elliptical gold (Au) nanodiscs. By exploiting the polarization-dependent nature of plasmonic resonance of the nano plasmonic array (NPA), the photoluminescence (PL) emission from the overlaid monolayer WSe 2 could be significantly manipulated. PL is preferentially enhanced at the NPA covered regions of the flake when excited closer to the plasmonic resonant frequencies and previously unpolarized WSe 2 PL emission gained ∼ 20 up to 40 % degree of linear polarization at room temperature. Obtaining significant spectral overlap between the PL spectrum of WSe 2 and the polarization tunable plasmonic resonance of the NPA plays a crucial role in this observation. The results demonstrate active tunability of optical emission from WSe 2 by using an otherwise passive plasmonic environment and opens the possibility of achieving atomically thin linearly polarized emitters at room temperature. In addition to fundamentally interesting physics of such interactions this can be highly desirable for ultrathin orientation sensitive opto-electronic device related applications.