Terahertz photonics

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Enhancement of ultrafast conductivity in surface-passivated GaAs

Optica Publishing Group (2007) tua3

Authors:

J Lloyd-Hughes, SKE Merchant, L Fu, HH Tan, C Jagadish, E Castro-Camus, MB Johnston
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Superfocusing of terahertz waves

NATURE PHOTONICS 1:1 (2007) 14-15
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Terahertz probe of carrier trapping in polymer transistors

Optica Publishing Group (2007) tua2

Authors:

J Lloyd-Hughes, T Richards, H Sirringhaus, E Castro-Camus, LM Herz, MB Johnston
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Terahertz-frequency conductivity of charge stripes in the antiferromagnet La5/3Sr1/3NiO4

(2007) 852-853

Authors:

J Lloyd-Hughes, D Prabhakaran, E Castro-Camus, AT Boothroyd, MB Johnston

Abstract:

We report the complex refractive index of La5/3Sr1/3NiO4 over the terahertz frequency range, obtained using time-domain spectroscopy. Negligible change in the complex refractive index with magnetic flux densities up to 6T was seen, while changes were observed as the lattice temperature was increased from 1.5 K to the charge-ordering temperature at 220 K. The terahertz frequency response therefore originates from the dielectric function rather than the magnetic permeability.
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Transmission and emission terahertz time-domain spectroscopy with polarisation-sensitive photoconductive receivers

(2007) 205-206

Authors:

E Castro-Camus, J Lloyd-Hughes, L Fu, HH Tan, C Jagadish, MB Johnston

Abstract:

In this contribution a detailed characterisation of the performance of three-contact polarisation-sensitive terahertz detectors will be discussed. Furthermore the appropriate mathematical formalism required for the analysis of polarisation-resolved THz measurements will be presented. In addition, measurements of the polarisation-resolved transmission of quartz and polarisation-resolved emission of (110) ZnTe will be shown in order to illustrate the relevance of polarisation in time domain measurements. Finally perspectives on experiments that require polarisation sensitivity will be discussed.
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