School of Physics - Research Publications

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Author: Roberts, Ann × End date: 2018 × Start date: 2010 × Type: Conference Paper ×

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    Plasmonics-enabled metal-semiconductor-metal photodiodes for high-speed interconnects and polarization sensitive detectors
    Panchenko, E ; Cadusch, JJ ; James, TD ; Roberts, A ; GarciaBlanco, SM ; Conti, GN (SPIE-INT SOC OPTICAL ENGINEERING, 2017-01-01)
    Metal-semiconductor-metal (MSM) photodiodes are commonly used in ultrafast photoelectronic devices. Re- cently it was shown that localized surface plasmons can su_ciently enhance photodetector capabilities at both infrared and visible wavelengths. Such structures are of great interest since they can be used for fast, broadband detection. By utilizing the properties of plasmonic structures it is possible to design photodetectors that are sensitive to the polarization state of the incident wave. The direct electrical readout of the polarization state of an incident optical beam has many important applications, especially in telecommunications, bio-imaging and photonic computing. Furthermore, the fact that surface plasmon polaritons can circumvent the di_raction limit, opens up signi_cant opportunities to use them to guide signals between logic gates in modern integrated circuits where small dimensions are highly desirable. Here we demonstrate two MSM photodetectors integrated with aluminum nanoantennas capable of distinguishing orthogonal states of either linearly or circularly polarized light with no additional _lters. The localized plasmon resonances of the antennas lead to selective screening of the un- derlying silicon from light with a particular polarization state. The non-null response of the devices to each of the basis states expands the potential utility of the photodetectors while improving precision. We also demonstrate a design of waveguide-coupled MSM photodetector suitable for planar detection of surface plasmons.
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    In-situ, non-invasive investigation of an outdoor wooden sculpture
    Brodie, G ; Harris, E ; Farrell, P ; TSE, NA ; Roberts, A ; KVANSAKUL, J (International Council of Museums, 2014-09-14)
    This paper reports on the development of a radio- frequency sensor unit for the non-invasive monitoring of Bruce Armstrong’s outdoor wooden sculpture constructed from River Red gum (Eucalyptus camaldulensis). This technique collects realtime data in situ in outdoor environments. Sensor units employing electromagnetic radiation in the microwave to radio frequency part of the spectrum can detect moisture changes, mould growth and termite infestation in specimen Australian timbers used in works of art. Model experiments using wood samples showed that moisture changes,decay levels, invasion of wood by insects such as termites and wood deterioration due to fungal attack can be detected with both ‘look through’ and radar-based microwave sensors. The monitoring provided information on the time response, temporal and cyclic activity of an outdoor, exposed wooden sculpture to moisture. A radio-frequency sensor is applicable for the monitoring of cultural materials to inform damage functions and dose values.