Sökning: "Ferroelectrics"

Visar resultat 11 - 15 av 27 avhandlingar innehållade ordet Ferroelectrics.

1. 11. Electronic materials : growth and characterisation

   Författare :Michael A. Grishin; Ulf O. Karlsson; Massimo Sancrotti; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Electrophysics; Photoemission; Ultra-short laser pulse; Thin film; Laser deposition; InSb; InAs; GaSb; Ferroelectrics; Elektrofysik; Electrophysics; Elektrofysik;

   Sammanfattning : In this thesis the InSb(111), InAs(111) and GaSb(001) surfaces have been studied by means of time- and angle-resolved photoemission spectroscopy based upon the femtosecond laser system. The pump-and-probe technique allows to analyse both electron states in the valence band and normally unpopulated electron states above the valence band, which can be occupied by transiently excited carriers at the optically pumped surface. LÄS MER

3. 12. Ferroelectric Heterostructures: Growth and Microwave Devices

   Författare :Khaled Khamchane; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; strontium ruthenate; Permittivity; Capacitor; Loss tangent; Pulsed laser deposition; Ferroelectrics;

   Sammanfattning : .... LÄS MER

4. 13. Novel tantalate-niobate films for microwaves

   Författare :Jang-Yong Kim; Alex Grishin; Andrey B. Kozyrev; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; ferroelectrics; sodium potassium niobates; silver tantalate niobate; barium stronitium titanate; Electronics; Elektronik;

   Sammanfattning : Microwave materials have been widely used in a variety of applications ranging from communication devices to military satellite services, and the study of materials properties at microwave frequencies and the development of functional microwave materials have always been among the most active areas in solid-state physics, materials science, and electrical and electronic engineering. In recent years, the increasing requirements for the development of high speed, high frequency circuits and systems require complete understanding of the properties of materials function at microwave frequencies. LÄS MER

5. 14. Advanced nano- and microdomain engineering of Rb-doped KTiOPO4 for nonlinear optical applications

   Författare :Charlotte Liljestrand; Carlota Canalias; Sunao Kurimura; KTH; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; KTiOPO4; nonlinear optics; MOPO; quasi-phase matching; SHG; ferroelectrics; domain structuring; periodic poling; Fysik; Physics;

   Sammanfattning : Fine-pitch ferroelectric domain gratings are extensively used for generation of light in the visible and near-infrared spectral regions through quasi-phase matched (QPM) frequency conversion. Sub-μm QPM devices enables demonstration of nonlinear optics with counterpropagating waves, a field of nonlinear optics which remains sparsely explored due to the difficulty of fabricatinghigh quality gratings. LÄS MER

7. 15. Non-Linear Optical Titanyl Arsenates Crystal Growth and Properties

   Författare :Jenni Nordborg; Chalmers tekniska högskola; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; top seeded solution growth; titanyl arsenates; ferroelectrics; KTP isomorphs; charge density; non-linear optical crystals;

   Sammanfattning : Crystals are appreciated not only for their appearance, but also for their unique physical properties which are utilized by the photonic industry in appliances that we come across every day. An important part of enabling the technical use of optical devices is the manufacture of crystals. LÄS MER