Quantum Optoelectronics

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Ultraviolet nanophotonics enables autofluorescence correlation spectroscopy on label-free proteins with a single tryptophan

Nano Letters 23 (2), 497-504

Authors:

Prithu Roy, Jean-Benoît Claude, Sunny Tiwari, Aleksandr Barulin, Jérôme Wenger

Abstract:

Reducing Nonradiative Losses in Perovskite LEDs Through Atomic Layer Deposition of Al2O3 on the Hole-injection Contact

University of Oxford (2023)

Authors:

Emil Dyrvik, Robert Taylor, Alexandra Ramadan, Jonathan Warby, Andreas Lauritzen, Karl-Augustin Zaininger, Henry Snaith, Suhas Mahesh, Melissa McCarthy

Abstract:

Experimental research data collected in laboratories at the Clarendon Laboratory, 2020-2022.
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Three-photon excitation of quantum two-level systems

CLEO: Fundamental Science, CLEO:FS 2023 (2023)

Authors:

V Villafane, B Scaparra, M Rieger, S Appel, R Trivedi, RA Oliver, RA Taylor, JJ Finley, K Müller

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.
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Three-photon excitation of quantum two-level systems

CLEO: Applications and Technology, CLEO:A and T 2023 (2023)

Authors:

V Villafane, B Scaparra, M Rieger, S Appel, R Trivedi, RA Oliver, RA Taylor, JJ Finley, K Müller

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.
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Elliptical polarization of localized states in an anisotropic single GaAs quantum ring

Nanomaterials MDPI 13:1 (2022) 184

Authors:

Seongho Park, Minju Kim, Inhong Kim, Robert A Taylor, Jindong Song, Kwangseuk Kyhm

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.
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