Sökning: "photonic bandgap"

Visar resultat 6 - 10 av 13 avhandlingar innehållade orden photonic bandgap.

1. 6. Optical studies of AlN and GaO based nanostructures using Mueller matrix spectroscopic ellipsometry

   Författare :Samiran Bairagi; Kenneth Järrendahl; Ching-Lien Hsiao; Bruno Gallas; Linköpings universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; GLAD; MMSE; PVD; III-nitrides; Oxides; Anisotropy; Bandgap;

   Sammanfattning : This thesis explores the diverse optical properties manifested when light interacts with various materials, with an emphasis on circular polarization- and bandgaprelated phenomena. The studies in this work are centered around Mueller matrix spectroscopic ellipsometry, with the objective of synthesizing and characterizing nanostructured and high-quality thin films to expand our understanding of the optical properties arising from their underlying structure and electronic transitions, respectively. LÄS MER

3. 7. Engineering Multicomponent Nanostructures for MOSFET, Photonic Detector and Hybrid Solar Cell Applications

   Författare :Asghar Jamshidi Zavaraki; Hans Ågren; Kevin J. Webb; KTH; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Epitaxial G rowth; Reduced Pressure Chemical Vapor Deposition; GeSnSiC; MOSFET; Photonic Detector; Resistivity; Phosp hor and Boron doping; Colloidal QDs Sensitized Solar Cell; Cd - free and Cd - based QDs; High Resolution Reciprocal Lattice Map; High Resolution X - Ray Diffraction; High Resolution Transmission Electron Microscopy; High resolution Scanning E lectron Microscopy .;

   Sammanfattning : Silicon technologyhas been seekingfor a monolithic solution for a chip where data processing and data communication is performed in the CMOS part and the photonic component, respectively. Traditionally, silicon has been widely considered for electronic applications but not for photonic applications due to its indirect bandgap nature. LÄS MER

4. 8. Photonic devices with MQW active material and waveguide gratings : modelling and characterisation

   Författare :Nadeem Akram; Lars Thylén; Hartmut Hillmer; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Method of Lines; Grating; ARROW Waveguide; Semiconductor laser; quantum well; Photonics; Fotonik;

   Sammanfattning : The research work presented in this thesis deals with modelling, design and characterisation of passive and active optical waveguide devices. The rst part of the thesis is related to algorithm development and numerical modelling of planar optical waveguides and gratings using the Method of Lines (MoL). LÄS MER

5. 9. Top-down Fabrication Technologies for High Quality III-V Nanostructures

   Författare :Shagufta Naureen; Srinivasan Anand; Clivia M. Sotomayor Torres; KTH; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; III-V nanostructures; colloidal lithography; top-down fabrication; dry etching; quantum well; multilayer structures; nanowires; nanopillars; nanodisks; mono-layer etching; surface passivation; photoluminescence; carrier life time; total reflectivity; photonic crystals; nanomesh;

   Sammanfattning : III-V nanostructures have attracted substantial research effort due to their interesting physical properties and their applications in new generation of ultrafast and high efficiency nanoscale electronic and photonic components. The advances in nanofabrication methods including growth/synthesis have opened up new possibilities of realizing one dimensional (1D) nanostructures as building blocks of future nanoscale devices. LÄS MER

7. 10. Reflective structural colors and their actuation using electroactive conducting polymers

   Författare :Stefano Rossi; Magnus Jonsson; Eleni Stavrinidou; Laura Na Liu; Linköpings universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Structural colors; Reflective displays; Optical nanocavities; Conducting polymers; Electrochemical tuning.;

   Sammanfattning : The integration of inorganic photonic nanostructures with organic materials opens new possibilities to dynamically modify the optical response of photonic devices. This thesis focuses on how to generate efficient reflective structural colors and tune them in combination with a conducting polymer (CP). LÄS MER