41 results found
Abdurakhimov LV, Khan S, Panjwani NA, et al., Magnon-photon coupling in the noncollinear magnetic insulator Cu2OSeO3, Physical Review B, Vol: 99, ISSN: 2469-9950
Breeze JD, Salvadori E, Sathian J, et al., 2017, Room-temperature cavity quantum electrodynamics with strongly coupled Dicke states, NPJ QUANTUM INFORMATION, Vol: 3, ISSN: 2056-6387
Sathian J, Breeze JD, Richards B, et al., 2017, Solid-state source of intense yellow light based on a Ce:YAG luminescent concentrator, OPTICS EXPRESS, Vol: 25, Pages: 13714-13727, ISSN: 1094-4087
Salvadori E, Breeze JD, Tan K-J, et al., 2017, Nanosecond time-resolved characterization of a pentacene-based room-temperature MASER, SCIENTIFIC REPORTS, Vol: 7, ISSN: 2045-2322
Breeze J, 2016, Temperature and Frequency Dependence of Complex Permittivity in Metal Oxide Dielectrics, Publisher: Springer, ISBN: 9783319445458
The main reason for this is the lack of accurate data for a harmonic coupling coefficient and phonon eigenfrequencies at arbitrary q vectors in the Brillouin zone.
Breeze J, Tan K-J, Richards B, et al., 2015, Enhanced magnetic Purcell effect in room-temperature masers, NATURE COMMUNICATIONS, Vol: 6, ISSN: 2041-1723
Donchev E, Pang JS, Gammon PM, et al., 2014, The rectenna device: From theory to practice (a review), MRS Energy & Sustainability, Vol: 1, ISSN: 2329-2229
Oxborrow M, Breeze JD, Alford NM, 2012, Room-temperature solid-state maser, NATURE, Vol: 488, Pages: 353-+, ISSN: 0028-0836
Lei DY, Kena-Cohen S, Zou B, et al., 2012, Spectroscopic ellipsometry as an optical probe of strain evolution in ferroelectric thin films, OPTICS EXPRESS, Vol: 20, Pages: 4419-4427, ISSN: 1094-4087
Breeze J, Oxborrow M, Alford NM, 2011, Better than Bragg: Optimizing the quality factor of resonators with aperiodic dielectric reflectors, APPLIED PHYSICS LETTERS, Vol: 99, ISSN: 0003-6951
Centeno A, Xie F, Breeze J, et al., 2011, Calculations of Scattering and Absorption Efficiencies of Nobel Metal Nanoparticles, IEEE Applied Electromagnetics Conference (AEMC), Publisher: IEEE
Centeno A, Xie F, Breeze JD, et al., 2011, Electromagnetic Design of Solar Collectors, Progress in Electromagnetics Research Symposium (PIERS), Publisher: ELECTROMAGNETICS ACAD, Pages: 1512-1515, ISSN: 1559-9450
Shimada T, Ichikawa K, Minemura T, et al., 2010, Intrinsic Microwave Dielectric Loss of Lanthanum Aluminate, IEEE TRANSACTIONS ON ULTRASONICS FERROELECTRICS AND FREQUENCY CONTROL, Vol: 57, Pages: 2243-2249, ISSN: 0885-3010
Centeno A, Breeze J, Ahmed B, et al., 2010, Scattering of light into silicon by spherical and hemispherical silver nanoparticles, OPTICS LETTERS, Vol: 35, Pages: 76-78, ISSN: 0146-9592
Shimada T, Ichikawa K, Minemura T, et al., 2010, Temperature and frequency dependence of dielectric loss of Ba(Mg1/3Ta2/3)O-3 microwave ceramics, 11th Electroceramics Conference 2008, Publisher: ELSEVIER SCI LTD, Pages: 331-334, ISSN: 0955-2219
Breeze JD, Perkins JM, McComb DW, et al., 2009, Do Grain Boundaries Affect Microwave Dielectric Loss in Oxides?, JOURNAL OF THE AMERICAN CERAMIC SOCIETY, Vol: 92, Pages: 671-674, ISSN: 0002-7820
Breeze J, Krupka J, Centeno A, et al., 2009, Temperature-stable and high Q-factor TiO2 Bragg reflector resonator, APPLIED PHYSICS LETTERS, Vol: 94, ISSN: 0003-6951
Shimada T, Ichikawa K, Minemura T, et al., 2009, Intrinsic Microwave Dielectric Loss of Lanthanum Aluminate, Joint Meeting of 12th International Meeting on Ferroelectricity/18th IEEE International Symposium on Applications of Ferroelectrics (IMF-ISAF-2009), Publisher: IEEE, Pages: 250-+, ISSN: 1099-4734
Centeno A, Breeze JD, Alford NMN, et al., 2008, Measurement of high loss dielectric materials using a resonant technique
This paper will report on a technique that has been developed for the measurement of the dielectric loss of materials which have a relatively high loss tangent. The method used employs a composite resonator that consists of the material under test being placed in the centre of a low loss ceramic ring resonator. The important feature of this configuration is that the electric energy filling factor in the sample is significantly lowered. This has the desirable effect of reducing the contribution to the resonator Q-factor of the sample material which has a high loss compared to the ceramic ring resonator. This enables the measurement of dielectric loss tangents which are significantly larger than those that can be measured using a conventional technique, such as making a cylindrical dielectric resonator of the sample material. In this technique the choice of resonant mode is very important. The electrical energy filling factor must low enough to ensure a measurable Q factor but at the same time high enough to measure a detectable perturbation of the resonance. It is also important to know the electrical filling factor of the ring resonator, which is made of a well characterised ceramic material, and the Q-factor contribution of any conducting surfaces in the resonant structure such as cavity walls. The choice of resonant mode and the effects of the other components in the resonator are obtained by using Finite Difference Time Domain (FDTD) and Mode Matching modelling tools. Measurement of the loss tangent of high resistivity Silicon over temperature has already been carried out with this technique by employing a BZT ring resonator resonating at around 5GHz in the TE01? mode. The results are very promising with loss tangents being measured that are an order of magnitude higher than could be measurable using a more conventional resonant technique. The current focus of this work is the measurement of liquids at microwave and millimetre wavelengths using Alumina resonators
Krupka J, Breeze J, Alford NMN, et al., 2007, Measurements of permittivity and dielectric loss tangent of high resistivity float zone silicon at microwave frequencies
Real part of permittivity and the dielectric loss tangent of float zone high resistivity Silicon were measured at microwave frequencies at temperatures from 10 K up to 380 K employing dielectric resonator technique. The real part of permittivity proved to be frequency independent and the decrease in dielectric loss tangent versus frequency proved to be not entirely proportional to the inverse of frequency. At temperatures below 25 K where all free carriers are frozen-out loss tangents values the order of 10-4 were measured.
Breeze J, Krupka J, Alford NM, 2007, Enhanced quality factors in aperiodic reflector resonators, APPLIED PHYSICS LETTERS, Vol: 91, ISSN: 0003-6951
Centeno A, Breeze JD, Krupkaf J, et al., 2006, Evaluating the properties of dielectric materials for microwave integrated circuits, Pages: 21-26
It is important to be able to accurately evaluate the electrical properties of dielectric materials to enable the accurate design of passive microwave integrated circuit components. This paper reports on research that has been undertaken in this area at London South Bank University. Three measurement techniques are reported. The first is a novel technique for measuring dielectric materials with a large tan δ using a composite resonator. The second is the measurement of the permittivity of ferroelectric thin films using a planar capacitor. The third is the use of an evanescent microwave probe to find the electrical properties at the surface of a sample.
Krupka J, Breeze J, Centeno A, et al., 2006, Measurements of permittivity, dieletric loss tangent, and resistivity of float-zone silicon at microwave frequencies, IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES, Vol: 54, Pages: 3995-4001, ISSN: 0018-9480
Dunne LJ, Axelsson AK, Alford NM, et al., 2006, Quasi-classical fluctuation-dissipation description of dielectric loss in oxides with implications for quantum information processing, INTERNATIONAL JOURNAL OF QUANTUM CHEMISTRY, Vol: 106, Pages: 986-993, ISSN: 0020-7608
Pullar RC, Breeze JD, Alford NM, 2005, Characterization and microwave dielectric properties of M2+Nb2O6 ceramics, JOURNAL OF THE AMERICAN CERAMIC SOCIETY, Vol: 88, Pages: 2466-2471, ISSN: 0002-7820
Aupi X, Breeze J, Ljepojevic N, et al., 2004, Microwave dielectric loss in oxides: Theory and experiment (vol 95, pg 2639, 2004), JOURNAL OF APPLIED PHYSICS, Vol: 96, Pages: 6943-6943, ISSN: 0021-8979
Alford NM, Breeze J, Penn SJ, 2004, Temperature stabilisation of dielectric resonator, US6803132 B1
A temperature stabilised ceramic material which has low dielectric loss and high thermal conductivity is a layered structure with a first layer formed of titania doped alumina and the second layer is a thin layer of titanium dioxide, with the layers attached by solid state diffusion.
Aupi X, Breeze J, Ljepojevic N, et al., 2004, Microwave dielectric loss in oxides: Theory and experiment, JOURNAL OF APPLIED PHYSICS, Vol: 95, Pages: 2639-2645, ISSN: 0021-8979
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