Terahertz photonics

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Dynamic terahertz polarization in single-walled carbon nanotubes

PHYSICAL REVIEW B 82:8 (2010) ARTN 085441

Authors:

XL Xu, P Parkinson, K-C Chuang, MB Johnston, RJ Nicholas, LM Herz
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Role of Ultrafast Torsional Relaxation in the Emission from Polythiophene Aggregates

JOURNAL OF PHYSICAL CHEMISTRY LETTERS 1:19 (2010) 2788-2792

Authors:

Patrick Parkinson, Christian Mueller, Natalie Stingelin, Michael B Johnston, Laura M Herz
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Terahertz radiation from multiplexed photo-Dember currents

Optica Publishing Group (2010) tub5

Authors:

G Klatt, F Hilser, W Qiao, R Gebs, A Bartels, K Huska, U Lemmer, G Bastian, MB Johnston, M Fischer, J Faist, T Dekorsy
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Ultrafast Terahertz Conductivity Dynamics in Mesoporous TiO2: Influence of Dye Sensitization and Surface Treatment in Solid-State Dye-Sensitized Solar Cells

JOURNAL OF PHYSICAL CHEMISTRY C 114:2 (2010) 1365-1371

Authors:

Priti Tiwana, Patrick Parkinson, Michael B Johnston, Henry J Snaith, Laura M Herz
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Terahertz excitonic response of isolated single-walled carbon nanotubes

Journal of Physical Chemistry C 113:42 (2009) 18106-18109

Authors:

X Xu, K Chuang, RJ Nicholas, MB Johnston, LM Herz

Abstract:

We have investigated the ultrafast far-infrared transmission of isolated single-walled carbon nanotubes using optical-pump THz-probe spectroscopy. The THz dielectric response is dominated by excitons with an initial, rapid decay due to Auger recombination followed by a slow decay of isolated single excitons. Frequencydependent analysis of the photomduced dielectric function suggest an internal excitonic excitation at ∼11 meV with further low-frequency (∼0.6 and 1.4 THz) absorption features at high densities ascribed to exciton complexes. A featureless conductivity bleaching is attributed to an exciton-induced reduction in the mobility of free carriers caused by phase-space filling. © 2009 American Chemical Society.
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