Search results for "Kerr"
showing 10 items of 494 documents
Counter-propagating frequency mixing with Terahertz waves in diamond
2013
Frequency conversion by means of Kerr nonlinearity is one of the most common and exploited nonlinear optical processes in the UV, visible, IR, and mid-IR spectral regions. Here we show that wave mixing of an optical field and a terahertz wave can be achieved in diamond, resulting in the frequency conversion of the terahertz radiation either by sum- or difference-frequency generation. In the latter case, we show that this process is phase matched and most efficient in a counterpropagating geometry.
Itseyden konstituutio kehitysprosessina : näkökulmia itseyden muodostumiseen Erik H. Eriksonin psykoanalyyttisen kehitysteorian ja Charles Taylorin f…
2007
Tutkielma käsittelee itseyden ja identiteetin muodostumista ja siihen vaikuttavia keskeisiä tekijöitä. Identiteettiproblematiikkaa lähestytään Erik H. Eriksonin psykoanalyyttista ja psykososiaalista egon kehitysteoriaa sekä erityisesti ego-identiteetin muodostumista avaten. Toisena keskeisenä ajattelijana käytetään Charles Tayloria sekä hänen teoriaansa itseydestä ja moraalisesta ontologiasta. Työn yhtenä keskeisenä tarkoituksena on hahmottaa Eriksonin käyttämiä identiteetin, egon ja minuuden käsitteitä sekä Taylorin hermeneuttisen antropologian itseyden ja identiteetin käsitteitä. Toiseksi tutkielmassa pyritään tuomaan esille, että Taylorin ajattelu rinnastuu monin paikoin Eriksonin ajatte…
Theory of birefringence and spontaneous polarization in the tetragonal phase of PbTiO3 due to lattice deformation caused by the change of temperature
1995
The microscopic mechanism of birefringence in the tetragonal phase of PbTiO3 is discussed taking account of the dipole-dipole interaction (dipole-dipole effect) due to the ionic and electronic polarizations of the crystal and the spontaneous Kerr effect as a cause of the strong local field acting on the constituent ions, where the lattice deformation due to the change of temperature is also considered. For the spontaneous polarization we use only the first effect. It is found that the birefringence and the spontaneous polarization are in good agreement with the experimental data.
Hydrogen and Deuterium Incorporation in ZnO Films Grown by Atomic Layer Deposition
2021
Zinc oxide (ZnO) thin films were grown by atomic layer deposition using diethylzinc (DEZ) and water. In addition to depositions with normal water, heavy water (2H2O) was used in order to study the reaction mechanisms and the hydrogen incorporation at different deposition temperatures from 30 to 200 °C. The total hydrogen concentration in the films was found to increase as the deposition temperature decreased. When the deposition temperature decreased close to room temperature, the main source of impurity in hydrogen changed from 1H to 2H. A sufficiently long purging time changed the main hydrogen isotope incorporated in the film back to 1H. A multiple short pulse scheme was used to study th…
Low-Temperature Atomic Layer Deposition of High-k SbOx for Thin Film Transistors
2022
SbOx thin films are deposited by atomic layer deposition (ALD) using SbCl5 and Sb(NMe2)3 as antimony reactants and H2O and H2O2 as oxidizers at low temperatures. SbCl5 can react with both oxidizers, while no deposition is found to occur using Sb(NMe2)3 and H2O. For the first time, the reaction mechanism and dielectric properties of ALD-SbOx thin films are systematically studied, which exhibit a high breakdown field of ≈4 MV cm−1 and high areal capacitance ranging from 150 to 200 nF cm−2, corresponding to a dielectric constant ranging from 10 to 13. The ZnO semiconductor layer is integrated into a SbOx dielectric layer, and thin film transistors (TFTs) are successfully fabricated. A TFT with…
"Meilä on kaikila samanlaiset tarinat" : tarinankerrontatutkimus tornionlaaksolaisuudesta vanhimpien aapualaisten arjessa ja tulevaisuudessa
2010
Carving Out Other Narratives : Textual Treatment in Jonathan Safran Foer's Tree of Codes
2017
Sukupuoli ja kansallinen maisema Umurissa
2014
Jalkapalloa ja kuvataidetta : Pentti Veroma (1903-1979)
2015
Pentti Veroma (b. Weckman) was born in Turku, the old capital of Finland in 1903. He has become known to the next generations especially in his home town as a painter. In his youth, he practiced athletics in Paavo Nurmi’s own sport club Turun Urheiluliitto (Turku Sports Union). Later Veroma started to play football in the team of Turun Urheiluliitto. In the early 1920s, the language question was a significant factor in the football, also in Turku. Pentti Veroma was in 1922 one of the founders of Turun Palloseura (Turku Football Club). Later one of the most prominent football clubs in Finland. The team of Turun Palloseura was recruited from the players of the Turun Riento and Turun Urheiluli…