Journal ArticleDOI
Anisotropic complex permittivity measurements of mono-crystalline rutile between 10 and 300 K
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TLDR
In this article, the dielectric properties of a single crystal rutile (TiO2) resonator have been measured using whispering gallery modes and the loss tangent and dielectoric constant of monocrystalline Rutile was determined accurately.Abstract:
The dielectric properties of a single crystal rutile (TiO2) resonator have been measured using whispering gallery modes. Q factors and resonant frequencies were measured from 300 to 10 K. Q factors as high as 104, 105, and 107 were obtained at 300, 80, and 10 K, respectively. Using the whispering gallery mode technique we have determined accurately the loss tangent and dielectric constant of monocrystalline rutile and obtained much more sensitive measurements than previously reported. We show that rutile exhibits anisotropy in both the loss tangent and permittivity over the range from 10 to 300 K.read more
Citations
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Wide band gap ferromagnetic semiconductors and oxides
Stephen J. Pearton,Cammy R. Abernathy,M. E. Overberg,G. T. Thaler,David P. Norton,Nikoleta Theodoropoulou,Arthur F. Hebard,Yun Daniel Park,Fan Ren,Jihyun Kim,Lynn A. Boatner +10 more
TL;DR: In this paper, a review focusing on promising candidate materials (such as GaN, GaP and ZnO) is presented, where the introduction of Mn into these and other materials under the right conditions is found to produce ferromagnetism near or above room temperature.
Journal ArticleDOI
Advances in wide bandgap materials for semiconductor spintronics
Stephen J. Pearton,Cammy R. Abernathy,David P. Norton,Arthur F. Hebard,Yun Daniel Park,Lynn A. Boatner,John D. Budai +6 more
TL;DR: In this article, the authors summarize recent progress in dilute magnetic semiconductors (DMS) such as (Ga, Mn)N, (Ga and Mn)P, (Zn, Mn), O, and SiGeN2 exhibiting room temperature ferromagnetic properties.
Journal ArticleDOI
Complex permittivity of some ultralow loss dielectric crystals at cryogenic temperatures
TL;DR: In this article, whispering gallery modes were used for very accurate permittivity and dielectric loss measurements of ultralow loss isotropic and uniaxially anisotropic single crystals.
Journal ArticleDOI
Nonlinear and quantum optics with whispering gallery resonators
TL;DR: Optical Whispering Gallery Modes (WGMs) derive their name from a famous acoustic phenomenon of guiding a wave by a curved boundary observed nearly a century ago as mentioned in this paper, which enables resonators of unique properties attractive both in science and engineering.
Journal ArticleDOI
Dielectric and infrared properties of TiO2 films containing anatase and rutile
TL;DR: In this paper, electrical and optical properties of low-temperature, plasma enhanced chemical vapour deposited films of TiO2 have been studied; the source gases were TiCl4 and O2.
References
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Journal ArticleDOI
Experimental observation of fundamental microwave absorption in high-quality dielectric crystals
TL;DR: In this article, the experimental study of small microwave losses (tan δ ≈ 10−4−10−9) in high-quality dielectric single crystals was devoted to the experimental analysis.
Journal ArticleDOI
Resonant frequencies of higher order modes in cylindrical anisotropic dielectric resonators
Michael E. Tobar,Anthony Mann +1 more
TL;DR: In this paper, the frequency of the lowest order mode in a cylindrical isotropic dielectric is extended to higher order modes in a anisotropic crystal, and four different axial match equations are derived depending on whether they are quasi TE or quasi TM, and have an odd or even axial mode number.
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Dielectric properties of rutile and its use in high temperature superconducting resonators
Nigel Klein,C. Zuccaro,U. Dähne,H. Schulz,N. Tellmann,R. Kutzner,A. G. Zaitsev,Roger Wördenweber +7 more
TL;DR: The microwave properties of single crystalline TiO2 (rutile) were investigated in this article, where the high permittivity of 105 and small tanδ in combination with the low microwave losses of high temperature superconductors (HTS) were utilized to construct a miniaturized X-band resonator with a high quality factor.
Journal ArticleDOI
Ultrahigh Q-factor cryogenic sapphire resonator
TL;DR: In this article, the electrical quality factor in whispering gallery modes of a cylindrical, high purity single crystal sapphire dielectric resonator was measured at 1.6 K for a mode at 12.7 GHz.