Sökning: "nonlinear-optical properties"

Visar resultat 16 - 20 av 36 avhandlingar innehållade orden nonlinear-optical properties.

1. 16. Birefringences and X-ray absorption from relativistic and nonrelativistic quantum chemical methods

   Författare :Ulf Ekström; Linköpings universitet; []
   Nyckelord :NATURAL SCIENCES; NATURVETENSKAP;

   Sammanfattning : Application of quantum chemical methods for the prediction and interpretation of optical and X-ray experiments have been performed. X-ray absorption and X-ray photo-electron spectroscopy of pentacene in the gas phase has been studied using the static exchange approximation. LÄS MER

3. 17. Synthesis and optical characterization of optical power limiting platinum(II) acetylides

   Författare :Marcus Carlsson; Bertil Eliasson; Jerker Mårtensson; Umeå universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Platinum acetylides; nonlinear absorption; optical power limiting; Sonogashira coupling; solution gels; thiophene; Organic chemistry; Organisk kemi;

   Sammanfattning : Interactions between light and a molecule can result in reversible or irreversible changes in properties of both the light and the molecule. Of the many known interactions, nonlinear absorption is a process in which an intense light signal, for instance from a laser, can be moderated. LÄS MER

4. 18. Applications of Chromophores and Multiphoton Techniques to Study Structure and Interactions of Bio-macromolecules in Assembled State

   Författare :Piotr Hanczyc; Chalmers tekniska högskola; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Z-scan; One-photon spectroscopy; oxazole yellow dyes; two-photon absorption.; non-linear spectroscopy; PVA DNA dyes films; linear dichroism; ruthenium complexes;

   Sammanfattning : The research presented in this thesis is concerned with the linear and nonlinear optical properties of biopolymers and the chromophores that bind to them. This thesis combines analyses of the interactions of biomolecules with technological improvements of already existing systems for bionanotechnology-related research. LÄS MER

5. 19. Theoretical Design of Molecular Photonic Materials

   Författare :Yanhua Wang; Yi Luo; David Beljonne; KTH; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Optical property; Molecular material; Solvent environment; Nuclear vibrations; Aggregation effect; Theoretical chemistry; Teoretisk kemi;

   Sammanfattning : This thesis presents a theoretical study on optical properties of molecular materials. Special emphasis has been put on the influence of solvent environment, nuclear vibrations, and aggregation effects on molecular properties like linear and nonlinear polarizabilities, one- and two-photon absorption probabilities. LÄS MER

7. 20. Organic and organometallic compounds for nonlinear absorption of light

   Författare :Per Lind; Bertil Eliasson; Adolf Gogoll; Umeå universitet; []
   Nyckelord :Organic chemistry; Nonlinear absorption; thiophene; platinum complexes; optical limiting; sonogashira coupling reactions; molecular orbital calculations; Organisk kemi; organisk kemi; Organic Chemistry;

   Sammanfattning : The demand for protection of eyes and various types of optical sensors from laser-beam pulses has resulted in the search for optical limiting devices that have the property of being transparent at low intensity of light (normal light), but non-transparent towards high intensity (laser) light. This type of protection may be obtained by using an organic material that displays nonlinear optical (NLO) properties. LÄS MER