Publications
35 results found
Hao L, Mattevi C, Gallop J, et al., 2012, Microwave surface impedance measurements on reduced graphene oxide, NANOTECHNOLOGY, Vol: 23, ISSN: 0957-4484
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- Citations: 14
Galer S, Hao L, Gallop J, et al., 2011, Design concept for a novel SQUID-based microdosemeter., Radiat Prot Dosimetry, Vol: 143, Pages: 427-431
The interest in proton and ion-beam therapy has increased substantially in recent years, leading the Bureau International des Poids et Mesures to recommend that a new quantity be defined to account for the biological effect of treatment modalities used in the radiotherapy. In response, we have begun work on the design of a new microbolometer based on the inductive superconducting transition-edge detector (ISTED) designed at the National Physical Laboratory. Our work aims to expand the use of the ISTED from its current use as an infra-red detector to the measurement of energy deposition of photons, hadrons and ions by incorporating a tissue-equivalent absorber. We present here the work carried out till date, including the detection of single visible photons, with an energy resolution of 0.2 eV and a time response of a few microseconds, using a 15-µm Superconducting QUantum Interference Device operating at 9 K. We also describe thermal computational modelling carried out for a simple ISTED absorber. Finally, we discuss the work currently in progress and that to be carried out before the detector is realised.
Kazakova O, Panchal V, Gallop J, et al., 2010, Ultrasmall particle detection using a submicron Hall sensor, 11th Joint MMM-Intermag Conference, Publisher: AMER INST PHYSICS, ISSN: 0021-8979
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- Citations: 23
Kazakova O, Gallop JC, See P, et al., 2009, Detection of a Micron-Sized Magnetic Particle Using InSb Hall Sensor, International Magnetics Conference 2009 (INTERMAG), Publisher: IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, Pages: 4499-4502, ISSN: 0018-9464
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- Citations: 16
Gallop J, 2009, Fundamental metrology in the future: Measuring the single quantum, EUROPEAN PHYSICAL JOURNAL-SPECIAL TOPICS, Vol: 172, Pages: 399-408, ISSN: 1951-6355
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- Citations: 3
Maher RC, Zhang T, Cohen LF, et al., 2009, Towards a metrological determination of the performance of SERS media, PHYSICAL CHEMISTRY CHEMICAL PHYSICS, Vol: 11, Pages: 7463-7468, ISSN: 1463-9076
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- Citations: 4
Kazakova O, Gallop J, Perkins G, et al., 2007, Scanned micro-Hall microscope for detection of biofunctionalized magnetic beads (vol 90, art no 162502, 2007), APPLIED PHYSICS LETTERS, Vol: 90, ISSN: 0003-6951
Kazakova O, Gallop J, Perkins G, et al., 2007, Scanned micro-Hall microscope for detection of biofunctionalized magnetic beads, APPLIED PHYSICS LETTERS, Vol: 90, ISSN: 0003-6951
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- Citations: 7
Purnell AJ, Hao L, Gallop JC, et al., 2006, Characterization of superconducting thin films using a generic property of resonators, 8th Symposium on High Temperature Superconductors in High Frequency Fields, Publisher: SPRINGER, Pages: 633-636, ISSN: 1557-1939
Brown E, Hao L, Gallop JC, et al., 2006, The effect of molecular oxygen on the thermal conductance of multi-walled nanotubes - a preliminary investigation, 20th International Winterschool/Euroconference on Electronic Properties of Novel Materials, Publisher: WILEY-V C H VERLAG GMBH, Pages: 3380-3384, ISSN: 0370-1972
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- Citations: 2
Maher RC, Cohen LF, Gallop JC, et al., 2006, Temperature-dependent anti-Stokes/Stokes ratios under surface-enhanced Raman scattering conditions, JOURNAL OF PHYSICAL CHEMISTRY B, Vol: 110, Pages: 6797-6803, ISSN: 1520-6106
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- Citations: 47
Purnell AJ, Hao L, Gallop JC, et al., 2006, Characterization of superconducting thin films using a generic property of resonators, JOURNAL OF SUPERCONDUCTIVITY AND NOVEL MAGNETISM, Vol: 19, Pages: 107-110, ISSN: 1557-1939
Gallop J, 2005, The quantum electrical triangle., Philos Trans A Math Phys Eng Sci, Vol: 363, Pages: 2221-2247, ISSN: 1364-503X
The past 35 years have seen the development of an unexpected plethora of quantum electrical standards based on just two fundamental constants, e and h. First came a voltage standard based on the Josephson a.c. effect, in terms of which most maintained primary standards of voltage are defined. This was followed a decade later by the quantized Hall effect, based on the von Klitzing constant which allows the ohm to be maintained very precisely. It became clear 20 years ago that there is also a possible quantum current standard. This third standard has yet to play a full part in practical electrical metrology. However, recent developments suggest that there are many different possible manifestations in which such a current standard might be realized. The three quantum standards, taken together, define the quantum electrical triangle of standards which would allow the units to be realized in terms of different combinations of e and h. We summarize the very different physics behind the three standards, reviewing the present state of development in all three. Implications for the future are also considered, especially relating to ultra-low temperature, nanoscale and truly quantum mechanical versions of the standards.
Purnell AJ, Cohen LF, Hao L, et al., 2005, Failure analysis of high temperature superconducting films at high microwave power using microsecond time domain measurements, APPL PHYS LETT, Vol: 86, Pages: 092506-1-092506-3, ISSN: 0003-6951
Halliwell CM, Davies JA, Gallop JC, et al., 2004, Real-time scanning tunnelling microscopy imaging of protein motion at electrode surfaces., Bioelectrochemistry, Vol: 63, Pages: 225-228, ISSN: 1567-5394
A mutant (K27C) of the blue copper protein azurin [Eur. J. Biochem. 194 (1990) 109; J. Mol. Biol. 221 (1991) 765] for orientated immobilisation on gold surfaces was analysed by scanning tunnelling microscopy (STM) both in a resting state and following the application of a short potential pulse between the tip and sample.
Nurgaliev T, Cohen LF, Purnell A, et al., 2004, Surface resistance measurements of HTS films placed inside a cavity with a puck resonator, PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS, Vol: 403, Pages: 276-282, ISSN: 0921-4534
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- Citations: 3
Purnell AJ, Cohen LF, Zhai HY, et al., 2004, Nonlinear microwave response of an MgB<sub>2</sub> thin film, SUPERCONDUCTOR SCIENCE & TECHNOLOGY, Vol: 17, Pages: 681-684, ISSN: 0953-2048
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- Citations: 8
Etchegoin P, Cohen LF, Hartigan H, et al., 2004, Localized plasmon resonances in inhomogeneous metallic nanoclusters, CHEMICAL PHYSICS LETTERS, Vol: 383, Pages: 577-583, ISSN: 0009-2614
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- Citations: 17
Etchegoin P, Cohen LF, Hartigan H, et al., 2003, Electromagnetic contribution to surface enhanced Raman scattering revisited, JOURNAL OF CHEMICAL PHYSICS, Vol: 119, Pages: 5281-5289, ISSN: 0021-9606
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- Citations: 92
Etchegoin P, Maher RC, Cohen LF, et al., 2003, New limits in ultrasensitive trace detection by surface enhanced Raman scattering (SERS), CHEMICAL PHYSICS LETTERS, Vol: 375, Pages: 84-90, ISSN: 0009-2614
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- Citations: 107
Lamura G, Purnell AJ, Cohen LF, et al., 2003, Microwave intermodulation distortion of MgB<sub>2</sub> thin films, APPLIED PHYSICS LETTERS, Vol: 82, Pages: 4525-4527, ISSN: 0003-6951
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- Citations: 15
Nurgaliev T, Purnell A, Qi X, et al., 2003, Investigation of microwave losses in superconducting liquid phase epitaxy Y<sub>0.7</sub>Yb<sub>0.3</sub>Ba<sub>2</sub>Cu<sub>3</sub>O<sub>7-δ</sub> films, SUPERCONDUCTOR SCIENCE & TECHNOLOGY, Vol: 16, Pages: 654-659, ISSN: 0953-2048
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- Citations: 1
Andreone A, Di Gennaro E, Lamura G, et al., 2003, A study on the nonlinear microwave electrodynamic response of e-beam evaporated MgB<sub>2</sub> superconducting thin films, International Workshop on Superconductivity in Magnesium Diboride and Related Materials, Publisher: IOP PUBLISHING LTD, Pages: 260-263, ISSN: 0953-2048
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- Citations: 6
Etchegoin P, Liem H, Maher RC, et al., 2003, Observation of dynamic oxygen release in hemoglobin using surface enhanced Raman scattering, CHEMICAL PHYSICS LETTERS, Vol: 367, Pages: 223-229, ISSN: 0009-2614
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- Citations: 54
Purnell AJ, Zhukov AA, Nurgaliev T, et al., 2003, The microwave surface impedance of MgB<sub>2</sub> thin films, SUPERCONDUCTOR SCIENCE & TECHNOLOGY, Vol: 16, Pages: 1-6, ISSN: 0953-2048
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- Citations: 13
Etchegon P, Liem H, Maher RC, et al., 2002, A novel amplification mechanism for surface enhanced Raman scattering, CHEMICAL PHYSICS LETTERS, Vol: 366, Pages: 115-121, ISSN: 0009-2614
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- Citations: 47
Hao L, Gallop J, Purnell A, et al., 2002, Intermodulation distortion in HTS thin films: a global heating model, 5th European Conference on Applied Superconductivity (EUCAS 2001), Publisher: ELSEVIER SCIENCE BV, Pages: 469-473, ISSN: 0921-4534
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- Citations: 2
Zhukov AA, Purnell A, Miyoshi Y, et al., 2002, Microwave surface resistance of MgB<sub>2</sub> (vol 80, pg 2347, 2002), APPLIED PHYSICS LETTERS, Vol: 80, Pages: 4461-4461, ISSN: 0003-6951
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- Citations: 4
Zhukov AA, Purnell A, Miyoshi Y, et al., 2002, Microwave surface resistance of MgB<sub>2</sub>, APPLIED PHYSICS LETTERS, Vol: 80, Pages: 2347-2349, ISSN: 0003-6951
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- Citations: 31
Cohen LF, Cowie AL, Purnell A, et al., 2002, Thermally induced nonlinear behaviour of HTS films at high microwave power, SUPERCONDUCTOR SCIENCE & TECHNOLOGY, Vol: 15, Pages: 559-565, ISSN: 0953-2048
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- Citations: 12
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