Imperial College London

Dr Gallop

Faculty of Natural SciencesDepartment of Physics

Academic Visitor
 
 
 
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Contact

 

+44 (0)20 7594 7567j.gallop

 
 
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Location

 

804Huxley BuildingSouth Kensington Campus

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Summary

 

Publications

Publication Type
Year
to

35 results found

Hao L, Mattevi C, Gallop J, Goniszewski S, Xiao Y, Cohen L, Klein Net al., 2012, Microwave surface impedance measurements on reduced graphene oxide, NANOTECHNOLOGY, Vol: 23, ISSN: 0957-4484

Journal article

Galer S, Hao L, Gallop J, Palmans H, Kirkby K, Nisbet Aet 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.

Journal article

Kazakova O, Panchal V, Gallop J, See P, Cox DC, Spasova M, Cohen LFet al., 2010, Ultrasmall particle detection using a submicron Hall sensor, 11th Joint MMM-Intermag Conference, Publisher: AMER INST PHYSICS, ISSN: 0021-8979

Conference paper

Kazakova O, Gallop JC, See P, Cox D, Perkins GK, Moore JD, Cohen LFet 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

Conference paper

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

Journal article

Maher RC, Zhang T, Cohen LF, Gallop JC, Liu FM, Green Met al., 2009, Towards a metrological determination of the performance of SERS media, PHYSICAL CHEMISTRY CHEMICAL PHYSICS, Vol: 11, Pages: 7463-7468, ISSN: 1463-9076

Journal article

Kazakova O, Gallop J, Perkins G, Cohen Let 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

Journal article

Kazakova O, Gallop J, Perkins G, Cohen Let al., 2007, Scanned micro-Hall microscope for detection of biofunctionalized magnetic beads, APPLIED PHYSICS LETTERS, Vol: 90, ISSN: 0003-6951

Journal article

Purnell AJ, Hao L, Gallop JC, Cohen LFet 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

Conference paper

Brown E, Hao L, Gallop JC, Macfarlane JC, Josephs-Franks PW, Cohen LFet 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

Conference paper

Maher RC, Cohen LF, Gallop JC, Le Ru EC, Etchegoin PGet 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

Journal article

Purnell AJ, Hao L, Gallop JC, Cohen LFet 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

Journal article

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.

Journal article

Purnell AJ, Cohen LF, Hao L, Gallop JCet 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

Journal article

Halliwell CM, Davies JA, Gallop JC, Josephs-Franks PWet 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.

Journal article

Nurgaliev T, Cohen LF, Purnell A, HaO L, Gallop Jet 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

Journal article

Purnell AJ, Cohen LF, Zhai HY, Christen HM, Paranthaman MP, Lowndes DH, Hao L, Gallop JCet al., 2004, Nonlinear microwave response of an MgB<sub>2</sub> thin film, SUPERCONDUCTOR SCIENCE & TECHNOLOGY, Vol: 17, Pages: 681-684, ISSN: 0953-2048

Journal article

Etchegoin P, Cohen LF, Hartigan H, Brown RJC, Milton MJT, Gallop JCet al., 2004, Localized plasmon resonances in inhomogeneous metallic nanoclusters, CHEMICAL PHYSICS LETTERS, Vol: 383, Pages: 577-583, ISSN: 0009-2614

Journal article

Etchegoin P, Cohen LF, Hartigan H, Brown RJC, Milton MJT, Gallop JCet al., 2003, Electromagnetic contribution to surface enhanced Raman scattering revisited, JOURNAL OF CHEMICAL PHYSICS, Vol: 119, Pages: 5281-5289, ISSN: 0021-9606

Journal article

Etchegoin P, Maher RC, Cohen LF, Hartigan H, Brown RJC, Milton MJT, Gallop JCet 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

Journal article

Lamura G, Purnell AJ, Cohen LF, Andreone A, Chiarella F, Di Gennaro E, Vaglio R, Hao L, Gallop Jet al., 2003, Microwave intermodulation distortion of MgB<sub>2</sub> thin films, APPLIED PHYSICS LETTERS, Vol: 82, Pages: 4525-4527, ISSN: 0003-6951

Journal article

Nurgaliev T, Purnell A, Qi X, Berenov A, Bugoslavsky Y, MacManus-Driscoll J, Hao L, Gallop J, Cohen LFet 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

Journal article

Andreone A, Di Gennaro E, Lamura G, Salluzzo M, Purnell A, Cohen LF, Hao L, Gallop J, Cantoni C, Paranthaman Met 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

Conference paper

Etchegoin P, Liem H, Maher RC, Cohen LF, Brown RJC, Milton MJT, Gallop JCet 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

Journal article

Purnell AJ, Zhukov AA, Nurgaliev T, Lamura G, Bugoslavsky Y, Lockman Z, MacManus-Driscoll JL, Zhai HY, Christen HM, Paranthaman MP, Lowndes DH, Jo MH, Blamire MG, Hao L, Gallop JC, Cohen LFet al., 2003, The microwave surface impedance of MgB<sub>2</sub> thin films, SUPERCONDUCTOR SCIENCE & TECHNOLOGY, Vol: 16, Pages: 1-6, ISSN: 0953-2048

Journal article

Etchegon P, Liem H, Maher RC, Cohen LF, Brown RJC, Hartigan H, Milton MJT, Gallop JCet al., 2002, A novel amplification mechanism for surface enhanced Raman scattering, CHEMICAL PHYSICS LETTERS, Vol: 366, Pages: 115-121, ISSN: 0009-2614

Journal article

Hao L, Gallop J, Purnell A, Cohen Let 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

Conference paper

Zhukov AA, Purnell A, Miyoshi Y, Bugoslavsky Y, Lockman Z, Berenov A, Zhai HY, Christen HM, Paranthaman MP, Lowndes DH, Jo MH, Blamire MG, Hao L, Gallop J, MacManus-Driscoll JL, Cohen LFet 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

Journal article

Zhukov AA, Purnell A, Miyoshi Y, Bugoslavsky Y, Lockman Z, Berenov A, Zhai HY, Christen HM, Paranthaman MP, Lowndes DH, Jo MH, Blamire MG, Hao L, Gallop J, MacManus-Driscoll JL, Cohen LFet al., 2002, Microwave surface resistance of MgB<sub>2</sub>, APPLIED PHYSICS LETTERS, Vol: 80, Pages: 2347-2349, ISSN: 0003-6951

Journal article

Cohen LF, Cowie AL, Purnell A, Lindop NA, Thiess S, Gallop JCet al., 2002, Thermally induced nonlinear behaviour of HTS films at high microwave power, SUPERCONDUCTOR SCIENCE & TECHNOLOGY, Vol: 15, Pages: 559-565, ISSN: 0953-2048

Journal article

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