Development of a localized surface plasmon-enhanced electron beam-pumped nanoscale light source for electron beam excitation-assisted optical microscopy.
Atsushi NakamuraShunpei ShibaKei HosomiAtsushi OnoYoshimasa KawataWataru InamiPublished in: Microscopy (Oxford, England) (2024)
We have demonstrated localized surface plasmon (LSP)-enhanced cathodoluminescence (CL) from an atomic layer deposition (ALD)-grown Al2O3/ZnO/Al2O3 heterostructure to develop a bright nanometer-scale light source for an electron beam excitation-assisted (EXA) optical microscope. Three types of metals, Ag, Al, and Au, were compared, and an 181-fold enhancement of CL emission was achieved with Ag nanoparticles (NPs), with the plasmon resonance wavelength close to the emission wavelength energy of ZnO. The enhanced emission is plausibly attributed to LSP/exciton coupling. However, it is also attributed to an increase in coupling efficiency with penetration depth and also to an increase in light extraction efficiency by grading the refractive indices at the heterostructure.
Keyphrases
- energy transfer
- quantum dots
- electron microscopy
- sensitive detection
- room temperature
- high resolution
- visible light
- high speed
- electron transfer
- optical coherence tomography
- reduced graphene oxide
- solar cells
- solid state
- monte carlo
- single molecule
- high throughput
- gold nanoparticles
- human health
- ionic liquid
- light emitting