Abstract
We study the coupling of GaAs quantum wells to waveguide–plasmon polaritons supported by a thin InAlGaAs-based slab waveguide and a Ag grating. The hybrid photon–plasmon modes are excited in a freestanding emitter–waveguide–plasmon structure realized by rolling-up strained InAlGaAs-based layers and nanopatterned Ag structures. By varying the grating’s bar width, we tune the plasmonic resonance of the system. We observe by means of spatially, spectrally, and temporally resolved photoluminescence measurements, a coupling of the quantum-well emission to the waveguide–plasmon system for a specific grating’s bar width. Supported by finite-element simulations, we can assign the coupling to the excitation of a waveguide–plasmon polariton.
Highlights
The control and manipulation of light-emitting properties of quantum emitters represent a major challenge for both fundamental science and application-based technologies
We investigate the coupling of quantum wells (QWs) to waveguide–plasmon polaritons (WPPs),15–18 hybrid photon–plasmon modes arising in a thin dielectric slab waveguide, which are excited and coupled into the waveguide by an adjacent periodic metal grating structure
We design a freestanding emitter–waveguide– plasmon structure that is composed of a 4nm GaAs QW within a 45-nm-thin InAlGaAs-based slab waveguide and a plasmonic Ag grating all embedded into the wall of a rolled-up microtube
Summary
The control and manipulation of light-emitting properties of quantum emitters represent a major challenge for both fundamental science and application-based technologies. We investigate the coupling of quantum wells (QWs) to waveguide–plasmon polaritons (WPPs), hybrid photon–plasmon modes arising in a thin dielectric slab waveguide, which are excited and coupled into the waveguide by an adjacent periodic metal grating structure. For this purpose, we design a freestanding emitter–waveguide– plasmon structure that is composed of a 4nm GaAs QW within a 45-nm-thin InAlGaAs-based slab waveguide and a plasmonic Ag grating all embedded into the wall of a rolled-up microtube. The design of triangle-shaped grating bars has been exploited to build a surface plasmon resonance-based integrable micro spectrometer, as reported in Ref. 21. Finite-element simulations show that the GaAs QW emission couples to a WPP, where at the same time, the excitation of the LSP is suppressed
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