Author: Publisher:
ISBN:
Category :
Languages : en
Pages : 0
Book Description
Optical Properties of Epitaxial ZnGeAs2 Thin Films
Author: Optical Properties of Epitaxial PLT Thin Films
Author: Preparation and Optical Properties of Epitaxial Thin Films of Some Ii-vi Semiconducting Compounds
Author: Rudolf LudekePublisher:
ISBN:
Category :
Languages : en
Pages : 248
Book Description
The work describes mainly the preparation and optical properties of epitaxial thin films of some II-IV semiconducting compounds. In addition optical modulation experiments on both thin film and bulk samples are reported. Epitaxial thin films of CdTe, HgTe, the alloy system CdxHg1-xTe, and CdSe were prepared by a flash evaporation technique on BaF2 substrates. The effects of various deposition parameters on the electron diffraction and optical structures of CdTe and CdSe were analyzed in detail. Optical transmission measurements on the epitaxial thin films were made at room and liquid nitrogen temperatures in the spectral region from 2 to 6 eV. Two novel approaches of optical modulation methods were pursued: piezo-transmission on Ge and CdTe polycrystalline films and electroreflectivity on bulk CdTe using an integral sandwich technique. Both methods were used down to liquid helium temperatures.
Electronic and Optical Properties of Metastable Epitaxial Thin Films of Layered Iridates
Author: Maryam SouriGrowth, Microstructure and Optical Properties of Epitaxial Lithium Tantalate Thin Films by Metalorganic Chemical Vapor Deposition
Author: Huyang XieSubstrate Effects on the Structure and Optical Properties of Epitaxial PbTiO3 Thin Films Prepared by Metal-organic Chemical Vapor Deposition
Author: Publisher:
ISBN:
Category :
Languages : en
Pages : 8
Book Description
Epitaxial PbTiO3 films were prepared by metal-organic chemical vapor deposition (MOCVD) on MgO(001), SrTiO3(001) and LaAlO3(001) surfaces. Four-circle X-ray diffraction and optical waveguiding experiments were performed to characterize the deposited films. The films on all three substrates were single-crystal; however, the domain structure of the films was strongly dependent on the substrate material. Films on MgO and LaAIO3 substrates showed a large amount of 90° domain structures, whereas, the degree of twinning was greatly suppressed for films on SrTiO3. The refractive indices and optical birefringence of the films were measured as a function of wavelength using the film-prism coupling method. The authors found that for films on LaAIO3(001), the ordinary index and for films on MgO(001) both the ordinary and extraordinary refractive indices were higher than those of bulk single-crystal PbTiO3. For films grown on SrTiO3(001), the ordinary refractive index was very close to that of single crystal PbTiO3. They correlate the increased refractive index and the reduced birefringence to the degree of epitaxial strain and twinning in the samples, respectively.
Epitaxial Oxide Thin Films II: Volume 401
Author: James S. SpeckPublisher:
ISBN:
Category : Science
Languages : en
Pages : 588
Book Description
Our understanding and control of epitaxial oxide heterostructures has progressed along multiple frontiers including magnetic, dielectric, ferroelectric, and superconducting oxide materials. This has resulted in both independent rediscovery and the successful borrowing of ideas from ceramic science, solid-state physics, and semiconductor epitaxy. A new field of materials science has emerged which aims at the use of the intrinsic properties of various oxide materials in single-crystal thin-film form. Exploiting the potential of these materials, however, will only be possible if many fundamental and engineering questions can be answered. This book represents continued progress toward fulfilling that promise. Technical information on epitaxial oxide thin films from industry, academia and government laboratories is presented. Topics include: dielectrics; ferroelectrics; optics; superconductors; magnetics; magnetoresistance.
Production and Optical Properties of Epitaxial Films of Lead Sulfide and Nickel Oxide
Author: Charles Ernest RossiEpitaxial Oxide Thin Films III: Volume 474
Author: Chang-Beom EomPublisher: Materials Research Society
ISBN: 9781558993785
Category : Technology & Engineering
Languages : en
Pages : 0
Book Description
As a result of the progress towards, and potential realized in electronic and optical device applications, the interest in epitaxial oxide thin films continue to flourish. The understanding of epitaxial oxide heterostructures has progressed, including magnetic, magnetoresistive, dielectric, ferroelectric and superconducting oxide materials. This book focuses on the fundamental issues of oxide epitaxy, microstructural evolution in epitaxy, and physical properties of epitaxial oxide thin films and how these issues relate to device applications. The book provides a vehicle through which groups of scientists working on a set of diverse phenomena could interact and present findings on very common specific themes involving similar materials. Due to the explosive growth of work in the area of colossal magnetoresistive (CMR) materials, especially in epitaxial form, the book also offers a forum to critically examine the fundamental nature of CMR in epitaxial oxide thin films and the relationship between CMR and defect structure. Other areas of emphasis include: ferroelectric memories, nonlinear optical waveguides, microwave electronics and magnetic oxide thin films.
Structure and Transport Properties of Epitaxial Oxide Thin Films
Author: Junsoo ShinPublisher:
ISBN:
Category :
Languages : en
Pages : 207
Book Description
Epitaxial thin films and heterostructures based on perovskite oxides have attracted significant attention in physics since perovskites exhibit an enormous range of electrical, magnetic, and optical properties, making them exciting systems for studies of the fundamental physical mechanisms of interactions between electron, lattice, and spin degrees of freedom. This dissertation has been focused on ferroelectricity in low-dimensional ferroelectric materials using ultra-thin ferroelectric epitaxial films (BaTiO3) with a metallic electrode (SrRuO3) by studying polarized ordering of the crystal structure and electronic transport through the films. High quality and highly oxidized epitaxial films are a prerequisite for the clear observation of physical properties such as ferroelectricity which depends on a sensitive balance of lattice structure, dynamics, and charge distribution. Measurements in low dimensional, ultra-thin films require a controlled surface status through in-situ characterization. As is demonstrated here, fundamental physical phenomena on surfaces and in ultra-thin films are easily modified due to reactivity in ambient air, even for oxide materials generally considered inert. This study is centered on in-situ low energy electron diffraction and scanning tunneling spectroscopy of BaTiO3 films grown on SrRuO3 electrodes on a SrTiO3 substrate. Results show out-of-plane polarized structure and polarization switching, which provide evidence of ferroelectricity in films down to 4 ML. Surface reconstruction in 1-2 ML thick BaTiO3 films is seriously affected by the interface between BaTiO3 films and SrRuO3 bottom electrode. Our observation in epitaxial BaTiO3 films indicates the existence of ferroelectricity with a lower limit (4 ML) for the minimum thickness than theoretical expectation (6 ML), which results from the difference of film stress, termination on films, and depolarizing screening.