New Publication – Distinguishing cap and core contributions to the photoconductive terahertz response of single GaAs based core–shell–cap nanowire detectors

corecap.pngOur recent work on single-nanowire terahertz detectors has been published in a special issue of the Lithuanian Journal of Physics, celebrating the 70th birthday of Prof. Arunas Krotkus.

In this work, Dr Kun Peng used single-nanowire terahertz detectors with different capping to understand the relative contribution of the core and cap to the detected THz signal. By tuning the cap to be thicker, it is possible to engineer these detectors to have shorter carrier lifetimes and as a result, to exhibit direct THz field detection.

New Publication – Single n-i-n InP Nanowires for Highly Sensitive Terahertz Detection

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Kun Peng has written a paper accepted in IOP Nanotechnology (http://iopscience.iop.org/article/10.1088/1361-6528/aa5d80).

The work, building on previous progress in single nanowire terahertz detectors, uses a combination of an axial doping profile and novel optical characterisation to improve the contact quality for these devices.

The new nanowire detectors show improved signal-to-noise ratio, now approaching that of conventional detectors.

 

MRS Fall – Invited Talk

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Patrick has given an invited talk at MRS Fall 2016 in Boston, on the topic of “Nanowire Photoconductive Detectors for Terahertz Time-Domain Spectroscopy”.
The research is based on the work of group member Kun Peng, and specifically covered the characterisation and development of single nanowire terahertz photoconductive detectors.

New Paper – Broad Band Phase Sensitive Single InP Nanowire Photoconductive Terahertz Detectors

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Kun’s paper “Broad Band Phase Sensitive Single InP Nanowire Photoconductive Terahertz Detectors” has been accepted for publication in Nano Letters. In the work, Kun has fabricated a single nanowire terahertz detector using an InP nanowire, and compared different antenna structures with traditional “bulk” InP detectors.

We have shown the utility of these structures for terahertz detection with a source limited bandwith, opening up possibilities for nanoscale terahertz electronics.

The paper, a collaboration between the University of Oxford Terahertz Photonics Group (Johnston Group), the Australian National University Electronic Materials Engineering Group (Jagadish Group) and the Parkinson Group at the University of Manchester is currently “just accepted”, and available at http://pubs.acs.org/doi/abs/10.1021/acs.nanolett.6b01528.