Abstract
Abstract Multi-resonant plasmonic simple geometries like nanocylinders and nanorods are highly interesting for two-photon photoluminescence and second harmonic generation applications, due to their easy fabrication and reproducibility in comparison with complex multi-resonant systems like dimers or nanoclusters. We demonstrate experimentally that by using a simple gold nanocylinder we can achieve a double resonantly enhanced two-photon photoluminescence of quantum dots, by matching the excitation wavelength of the quantum dots with a dipolar plasmon mode, while the emission is coupled with a radiative quadrupolar mode. We establish a method to separate experimentally the enhancement factor at the excitation and at the emission wavelengths for this double resonant system. The sensitivity of the spectral positions of the dipolar and quadrupolar plasmon resonances to the ellipticity of the nanocylinders and its impact on the two-photon photoluminescence enhancement are discussed.
Highlights
Two-photon photoluminescence (TPPL) is an emission process which can take place when an emitter absorbs two photons of low energy simultaneously and emits a photon of high energy
We demonstrate experimentally that by using a simple gold nanocylinder we can achieve a double resonantly enhanced two-photon photoluminescence of quantum dots, by matching the excitation wavelength of the quantum dots with a dipolar plasmon mode, while the emission is coupled with a radiative quadrupolar mode
The emission wavelength of the quantum dots (QDs) matches the spectral position of the quadrupolar plasmonic mode of the gold nanocylinder (GNC), while the laser excitation wavelength is close to the spectral position of the dipolar plasmonic mode
Summary
Two-photon photoluminescence (TPPL) is an emission process which can take place when an emitter absorbs two photons of low energy simultaneously and emits a photon of high energy. An emitter with a high two-photon absorption cross-section may absorb two photons simultaneously in the IR spectral range and emit a photon in the visible [9, 10]. This visible photon can efficiently generate free carriers and through electron-holes recombination release current in the electrical chain of solar cells
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