Nanoplasmonic array induced modified emission properties from monolayer WSe2

Two dimensional transition metal di-chalcogenide (2D TMDC) semiconductors provide unique scopes to investigate strongly confined systems and plasmonics can offer to be a promising platform to achieve interesting effects (e.g. enhanced quantum efficiency, strong coupling, deep subwavelength guiding of light etc.). Investigating integrated 2D TMDC-plasmonic systems remain critical in the pursuit to find novel possibilities in optical devices with applications ranging from improved light sources, detectors and sensors. I will discuss some recent results about the optical properties of monolayer WSe2 exfoliated on Au nanoplasmonic arrays (NPAs) with varied geometrical parameters. The NPAs were designed and fabricated to spectrally overlay the broad plasmonic resonances to the excitonic emission from WSe2, as a result of which upto seven -fold enhancement in photoluminescence (PL) emission was achieved.  Resonant plasmonic excitation revealed interaction between the excitonic emission and plasmonic resonance due to significant spectral overlap and linear polarization (DOP 30-40%) tunability of PL emission from WSe2 will be discussed.