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MicroPL optical setup

Professor Robert Taylor

Professor of Condensed Matter Physics

Research theme

  • Photovoltaics and nanoscience

Sub department

  • Condensed Matter Physics

Research groups

  • Quantum Optoelectronics
Robert.Taylor@physics.ox.ac.uk
Telephone: 01865 (2)72230
Clarendon Laboratory, room 246.1
orcid.org/0000-0003-2578-9645
  • About
  • Teaching
  • Positions available
  • Publications

Lasing in perovskite nanocrystals

Image of transverse modes from lasing nanocrystals
Nano Research, 14, 108, 2021

The effects of nitrogen and boron doping on the optical emission and diameters of single-walled carbon nanotubes

Carbon 44:13 (2006) 2752-2757

Authors:

LJ Li, M Glerup, AN Khlobystov, JG Wiltshire, JL Sauvajol, RA Taylor, RJ Nicholas

Abstract:

Using TEM, absorption and photoluminescence-excitation spectroscopy we have shown that nitrogen and nitrogen/boron doping of single-walled carbon nanotubes produce significant changes in both the optical properties and the diameter distribution of nanotubes produced by the arc-discharge method. Smaller diameter tubes are preferentially formed in the presence of boron. In addition the presence of nitrogen is found to significantly affect the emission properties of the nanotube ensemble, causing a shift in the dominant emission to lower energies, possibly due to changes in the bundling structure of the nanotubes in solution, but only very small changes are observed in the emission energies for individual nanotubes. © 2006 Elsevier Ltd. All rights reserved.
More details from the publisher

PL, magneto-PL and PLE of the trimetallic nitride template fullerene Er3N@C-80

PHYS STATUS SOLIDI B 243:13 (2006) 3037-3041

Authors:

MAG Jones, JJL Morton, RA Taylor, A Ardavan, GAD Briggs

Abstract:

Er3N@C,, exhibits sharp optical emission lines in the near-infrared attributed to fluorescence from the Er3+ ion. Here we demonstrate that high magnetic fields cause this spectrum to split, corresponding to transitions from the lowest field-split Kramers doublet of the I-4(13/2) manifold to the four lowest field-split levels of the I-4(15/2) manifold. The internal structure of these fullerenes can be spatially aligned with a preferred orientation under high magnetic field; the effect of alignment is to reduce the broadening associated with the isotropic spatial averaging characteristic of powder or frozen-solution spectra. Using a tunable 1.5 mu m laser, we directly observe non-cage-mediated optical interactions with the Er3+ ion. This spectroscopic method provides the opportunity to map the energy level structure of the incarcerated ion and to coherently control its quantum state. These qualities suggest that rare-earth endohedral fullerenes have characteristics that could be employed as a readout pathway for fullerene-based quantum information processing.
More details from the publisher

The effects of nitrogen and boron doping on the optical emission and diameters of single-walled carbon nanotubes

Carbon Elsevier BV 44:13 (2006) 2752-2757

Authors:

Lain-Jong Li, M Glerup, AN Khlobystov, JG Wiltshire, J-L Sauvajol, RA Taylor, RJ Nicholas
More details from the publisher

Direct optical excitation of a fullerene-incarcerated metal ion

Chemical Physics Letters 428:4-6 (2006) 303-306

Authors:

MAG Jones, RA Taylor, A Ardavan, K Porfyrakis, GAD Briggs

Abstract:

The endohedral fullerene Er3N@C80 shows characteristic 1.5 μm photoluminescence at cryogenic temperatures associated with radiative relaxation from the crystal-field split Er3+ 4I13/2 manifold to the 4I15/2 manifold. Previous observations of this luminescence were carried out by photoexcitation of the fullerene cage states leading to relaxation via the ionic states. We present direct non-cage-mediated optical interaction with the erbium ion. We have used this interaction to complete a photoluminescence-excitation map of the Er3+ 4I13/2 manifold. This ability to interact directly with the states of an incarcerated ion suggests the possibility of coherently manipulating fullerene qubit states with light. © 2006 Elsevier B.V. All rights reserved.
More details from the publisher

Surface investigation of a cubic AIN buffer layer and GaN grown on Si (111) and Si (100) as revealed by atomic force microscopy

Journal of the Korean Physical Society 49:3 (2006) 1092-1096

Authors:

MK Bae, DH Shin, SN Yi, JH Na, AM Green, RA Taylor, SH Park, NL Kang

Abstract:

We have studied the microscopic surface morphology of AlN which was revealed by using an atomic force microscopy (AFM). AlN was sputtered on Si (111) and Si (100) substrates for 30 and 60 minutes. AlN was observed to crystallize as cubic-AlN at an annealing temperature of 900 °C and an annealing time of 60 minutes. We present a model to explain this cubic AlN bonding configuration. GaN was grown on AlN/Si(111) and AlN/Si(100) substrates by using a hydride vapor phase epitaxy technique. A terrace with saw-tooth-shaped formations was observed on the GaN surface and could be explained in terms of the lattice mismatch and the gas diffusion rate.

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