Reducing Nonradiative Losses in Perovskite LEDs Through Atomic Layer Deposition of Al2O3 on the Hole-injection Contact
University of Oxford (2023)
Abstract:
Experimental research data collected in laboratories at the Clarendon Laboratory, 2020-2022.Three-photon excitation of quantum two-level systems
2023 Conference on Lasers and Electro-Optics, CLEO 2023 (2023)
Abstract:
We demonstrate that a two-level system, in form of an InGaN quantum dot, can only be efficiency excited using an odd number of photons (1 or 3) while resonant two-photon excitation is strongly suppressed.Modal gain enhancement of perovskite nanosheets by a patterned waveguide via spectral-length gain analysis
(2023)
Elliptical polarization of localized states in an anisotropic single GaAs quantum ring
Nanomaterials MDPI 13:1 (2022) 184
Abstract:
Localized states in an anisotropic single GaAs quantum ring were investigated in terms of polarization dependence of micro-photoluminescence spectrum at 5K. Given four Stokes parameters measured with a pair of linear polarizers and waveplates, the elliptical polarization states of two different vertical confinement states (k=1 and k=2) were compared with phase, rotation, and ellipticity angles. While the polarized emission intensity of the k=2 states becomes enhanced along [1,1,0] compared to that along [1,1¯,0], the polarization asymmetry of the k=1 states shows the opposite result. We conclude the polarization state is determined by the shape of the lateral wavefunctions. In the k=2 state, crescent-like wavefunctions are strongly localized, but the k=1 state consists of two crescent-like wavefunctions, which are connected weakly through quantum tunneling.Design of free-space couplers for suspended triangular nano-beam waveguides
Journal of Physics D: Applied Physics IOP Publishing 55:47 (2022) 474002