Mapping cavity modes of ZnO nanobelts
Applied Physics Letters 94:23 (2009)
Abstract:
ZnO nanostructures attract current interest because they have the potential to implement cavity quantum electrodynamics at room temperature. We report a photoluminescence mapping of ZnO nanobelts both at room temperature and 4.2 K. The multicavity modes were observed all over the belt surface, which were induced by Fabry-Ṕrot interference. The emission from the belt surface is enhanced at both the ends and the sides of the belt, and is highly linearly polarized in the direction perpendicular to the long axis of the belt. The results are explained using finite-difference time-domain simulations. © 2009 American Institute of Physics.Two-photon autocorrelation measurements on a single InGaN/GaN quantum dot
Nanotechnology IOP Publishing 20:24 (2009) 245702
Optical properties of Er3+ in fullerenes and in β-PbF2 single-crystals
Optical Materials 32:1 (2009) 251-256
Abstract:
With the aim of providing a thorough description of the optical properties of Er3+-doped endohedral fullerenes, we studied their characteristics in the light of those of well-known Er3+-doped β-PbF2 single-crystals. Various Er3+-doped endohedral fullerenes were considered: Er2C2@C82, where the Er2C2 group is encapsulated inside a cage of 82 carbon atoms and the Er3-xScxN@C80 (x = 0, 1 and 2) family, where the Er3N, Er2ScN and ErSc2N clusters are trapped in a 80 carbon atom cage. In this article, we discuss the absorption and photoluminescence of trivalent erbium ions in fullerenes and in β-PbF2 crystals. The extinction coefficient of Er3N@C80 was found to be 4.8 (±0.5) × 103 mol/l-1 cm-1 at 540 nm, due to the C80 cage absorbance. Even in a saturated fullerene solution, the absorption of Er3+ encapsulated inside a C80 cage cannot be observed at room temperature. We suggest that this is due to an insufficient number of Er3+ ions in the solution and their low absorption cross-section. Low temperature photoluminescence measurements show that the line width of Er3+ in a carbon cage, dissolved in a polycrystalline solvent, is similar to the one of Er3+ in β-PbF2 single-crystals. The quantum efficiency of Er3+ at 1.5 μm in fullerenes is four orders of magnitude lower than that for Er3+ in crystals, due to very efficient non-radiative decay processes. Molecular vibrations of the cage might be responsible for those rapid non-radiative de-excitations. © 2009 Elsevier B.V. All rights reserved.Acuminated fluorescence of Er3+ centres in endohedral fullerenes through the incarceration of a carbide cluster
CHEMICAL PHYSICS LETTERS 476:1-3 (2009) 41-45
Design of leaky modes of two-dimensional photonic crystal slabs to enhance the luminescence from Er3N@C80 fullerenes
OPTICS COMMUNICATIONS 282:17 (2009) 3637-3640