Terahertz photonics

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Improved performance of GaAs-based terahertz emitters via surface passivation and silicon nitride encapsulation

IEEE Journal on Selected Topics in Quantum Electronics 17:1 (2011) 17-21

Authors:

C Headley, L Fu, P Parkinson, X Xu, J Lloyd-Hughes, C Jagadish, MB Johnston

Abstract:

We have improved the stability and performance of terahertz (THz) photoconductive (Auston) switches using a combination of (NH4) 2S surface passivation (SP) and silicon nitride (Si3 N4) encapsulation. The influences of SP and encapsulation on the ultrafast electron dynamics in GaAs were examined using THz emission spectroscopy and optical pumpTHz probe spectroscopy. The power of THz radiation from the surface of photoexcited GaAs increased by a factor of 5 after passivation and encapsulation, while the process lengthened the trapping time for photoexcited charge carriers. By fabricating and assessing the performance of photoconductive switches, we found that passivation and encapsulation increased the average THz power generated fourfold. © 2010 IEEE.
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Doping influence on the ability to form single crystals

Chemical Physics Letters Elsevier 501:4-6 (2011) 330-334

Authors:

Kun Peng, Chen Ming, Xiang-Xi Ye, Wenxian Zhang, Jun Zhuang, Xi-Jing Ning
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III-V semiconductor nanowires for optoelectronic device applications

PROGRESS IN QUANTUM ELECTRONICS 35:2-3 (2011) 23-75

Authors:

Hannah J Joyce, Qiang Gao, H Hoe Tan, C Jagadish, Yong Kim, Jin Zou, Leigh M Smith, Howard E Jackson, Jan M Yarrison-Rice, Patrick Parkinson, Michael B Johnston
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Ultrafast Charge Separation at a Single-walled Carbon Nanotube – Polymer Interface

MRS Advances Springer Nature 1286:1 (2011) 207

Authors:

Samuel D Stranks, Christian Weisspfennig, Patrick Parkinson, Michael B Johnston, Laura M Herz, Robin J Nicholas
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Characterisation of nanostructures via terahertz spectroscopy

Conference on Optoelectronic and Microelectronic Materials and Devices, Proceedings, COMMAD (2010) 23-24

Authors:

P Parkinson, HJ Joyce, X Xu, Q Gao, HH Tan, C Jagadish, LM Herz, MB Johnston

Abstract:

We have used terahertz spectroscopy to measure the conductivity and time-resolved photoconductivity of a range of semiconducting nanostructures. This article focuses on our recent terahertz conductivity studies on semiconductor nanowires and single walled carbon nanotubes. © 2010 IEEE.
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