Strong anisotropic enhancement of photoluminescence in WS2 integrated with plasmonic nanowire array

Abstract Layered transition metal dichalcogenides (TMDCs) have shown great potential for a wide range of applications in photonics and optoelectronics. Nevertheless, valley decoherence severely randomizes its polarization which is important to light emitter. Plasmonic metasurface with unique way manipulate the light-matter interaction may provide an effective practical solution. Here by integrating TMDCs plasmonic nanowire arrays, we demonstrate strong anisotropic enhancement excitonic emission at different spectral positions. For indirect bandgap bilayer WS 2 , multifold can be achieved photoluminescence (PL) either perpendicular or parallel long axis nanowires, arises from coupling localized guided plasmon modes, respectively. Moreover, PL high linearity obtained direct benefiting from, addition enhancement, directional diffraction scattering arrays. Our method enhanced intensity contrasts conventional form-birefringence based on aspect ratio arrays where loss remarkable. results prototypical plasmon-exciton hybrid system nanoscale, enabling simultaneous control intensity, wavelength toward ultrathin photonic devices TMDCs.