Sökning: "Ferroelectrics"

Visar resultat 1 - 5 av 20 avhandlingar innehållade ordet Ferroelectrics.

  1. 1. Tunable Filters based on Ferroelectrics and Semiconductor Varactors

    Författare :Anders Eriksson; [2005]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; ferroelectrics; KTaO3; phase transition; dual mode filter; Cu BCB multilayer; tunable filter; quality factor; circular disc resonator; High Temperature Superconductor HTS ; SrTiO3;

    Sammanfattning : Experimental investigation and development of tunable microwave filters, based on single crystals of SrTiO3 (STO) and KTaO3 (KTO), form the main work of this thesis. The dielectric properties of STO and KTO crystals are evaluated experimentally for a wide temperature range, with a DC bias, using parallel-plate resonators with High Temperature Superconductor (HTS) and normal metal (Cu) electrodes. LÄS MER

  2. 2. Multifunctional Supramolecular Organic Ferroelectrics

    Detta är en avhandling från Linköping : Linköping University Electronic Press

    Författare :Indre Urbanaviciute; Linköpings universitet.; Linköpings universitet.; [2019]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

    Sammanfattning : Ferroelectric materials are known and valued for their multifunctionality arising from the possibility to perturb the remnant ferroelectric polarization by electric field, temperature and/or mechanical stimuli. While inorganic ferroelectrics dominate the current market, their organic counterparts may provide highly desired properties like eco-friendliness, easy processability and flexibility, concomitantly opening unique opportunities to combine multiple functionalities into a single compound that facilitates unprecedented device concepts and designs. LÄS MER

  3. 3. Ferroelectric Na0.5K0.5NbO3 as an electro-optic material

    Detta är en avhandling från Kista : Mikroelektronik och informationsteknik

    Författare :Mats Blomqvist; KTH.; [2002]
    Nyckelord :ferroelectrics; sodium potassium niobates; thin films; rf-magnetron sputtering; waveguiding; refractive index; prism coupling; dielectric tunability;

    Sammanfattning : Ferroelectrics are a group of advanced electronic materialswith a wide variety of properties useful in applications suchas memory devices, resonators and filters, infrared sensors,microelectromechanical systems, and optical waveguides andmodulators. Among the oxide perovskite-structured ferroelectricthin film materials sodium potassium niobate or Na0. LÄS MER

  4. 4. Nanosecond optical parametric oscillators and amplifiers based on periodically poled KTiOPO4

    Detta är en avhandling från Fysiska institutionen

    Författare :Jonas Hellström; KTH.; [2001]
    Nyckelord :optical parametric oscillators; optica parametric amplifiers; quasi-phasematching; KTiOPO4; nonlinear optics; frequency conversion; periodic electric field poling; ferroelectrics; high-order second harmonic generation; electro-optic effect;

    Sammanfattning : Optical parametric oscillators (OPOs) and optical parametricamplifiers (OPAs) constitute a class of optical frequencyconverting devices that have many possible applications, e.g.in range finding, molecular spectroscopy and medicine. LÄS MER

  5. 5. Engineering ferroelectric domains and charge transport by proton exchange in lithium niobate

    Detta är en avhandling från Stockholm : KTH Royal Institute of Technology

    Författare :Michele Manzo; KTH.; [2015]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Lithium niobate; Ferroelectrics; Materials Science and Engineering; Teknisk materialvetenskap; Physics; Fysik;

    Sammanfattning : Ferroelectrics are dielectric materials possessing a switchable spontaneous polarization, which have attracted a growing interest for a broad variety of applications such as ferroelectric lithography, artificial photosynthesis, random and dynamic access memories (FeRAMs and DRAM), but also for the fabrication of devices for nonlinear optics, etc. All the aforementioned applications rely on the control of the ferroelectric domains arrangement, or the charge distribution and transport. LÄS MER