Wavelength Tunable Single Nanowire Lasers Based onSurface Plasmon Polariton Enhanced Burstein–Moss Effect.

Wavelengthtunable semiconductor nanowire (NW) lasers are promising for multifunctionalapplications ranging from optical communication to spectroscopy analysis.Here, we present a demonstration of utilizing the surface plasmonpolariton (SPP) enhanced Burstein–Moss (BM) effect to tunethe lasing wavelength of a single semiconductor NW. The photonic lasingmode of the CdS NW (with length ∼10 μm and diameter ∼220nm) significantly blue shifts from 504 to 483 nm at room temperaturewhen the NW is in close proximity to the Au film. Systematic steadystate power dependent photoluminescence (PL) and time-resolved PLstudies validate that the BM effect in the hybrid CdS NW devices isgreatly enhanced as a consequence of the strong coupling between theSPP and CdS excitons. With decreasing dielectric layer thickness hfrom 100 to 5 nm, the enhancement of the BM effect becomesstronger, leading to a larger blue shift of the lasing wavelength.Measurements of enhanced exciton emission intensities and recombinationrates in the presence of Au film further support the strong interactionbetween SPP and excitons, which is consistent with the simulationresults. [ABSTRACT FROM AUTHOR]