Search for dissertations about: "Photonic Devices"

Showing result 21 - 25 of 87 swedish dissertations containing the words Photonic Devices.

  2. 21. Optical Parametric Devices in Periodically Poled LiTaO3

    Author : Martin Levenius; Katia Gallo; Valdas Pasiskevicius; Giuseppe Leo; KTH; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; nonlinear optics; parametric processes; frequency downconver-sion; quasi-phase matching; LiTaO3; broadband downconversion; quadratic cascading; nonlinear photonic crystals; twin-beam generation;

    Abstract : Optical parametric frequency conversion based on quasi phase matching (QPM) in nonlinear optical crystals is a powerful technique for generating coherent radiation in wavelength ranges spanning from the mid-infrared (mid-IR) to the blue, displaying low thermal load and high efficiency.This thesis shows how QPM in one- (1D) or two-dimensional (2D) lattices can be employed to engineer novel devices for parametric downconversion in the IR, af-fording freedom in designing both spectral and angular properties of the parametric output. READ MORE

  4. 22. Light manipulation in micro and nano photonic materials and structures

    Author : Zhihui Chen; Ying Fu; E. L. Ivchenko; KTH; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Photonic crystal; quantum dot; light-matter interaction;

    Abstract : Light manipulation is an important method to enhance the light-matter interactions in micro and nano photonic materials and structures by generating usefulelectric field components and increasing time and pathways of light propagationthrough the micro and nano materials and structures. For example, quantum wellinfrared photodetector (QWIP) cannot absorb normal incident radiation so thatthe generation of an electric field component which is parallel to the original incident direction is a necessity for the function of QWIP. READ MORE

  5. 23. Silicon photonic MEMS building blocks for low-power programmable circuits

    Author : Pierre Edinger; Kristinn Gylfason; Frank Niklaus; Sangyoon Han; KTH; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Photonics; silicon photonics; MEMS; photonic MEMS; 3D printing; liquid crystals; programmable photonics; phase shifters; optical switches; ring resonators; Electrical Engineering; Elektro- och systemteknik;

    Abstract : Silicon photonics, or the confinement and control of light in integrated silicon waveguides, has rapidly grown from research labs to high-end chips for telecommunications. With the associated improvements in waveguide performance, the technology is promising for a wide range of new applications, from computing to sensing. READ MORE

  6. 24. All-Fiber System for Photonic States Carrying Orbital Angular Momentum : A Platform for Classical and Quantum Information Processing

    Author : Alvaro Alarcón; Guilherme B. Xavier; Sebastião de Pádua; Linköpings universitet; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Quantum Communication; Optical communication; Orbital Angular Momentum; Photonic Lantern; Few-mode-fibers;

    Abstract : The protection of confidential data is a fundamental need in the society in which we live. This task becomes more relevant when observing that every day, data traffic increases exponentially, as well as the number of attacks on the telecommunication infra-structure. READ MORE

  7. 25. Photonic wavelength selective devices based on multi-mode interference waveguides

    Author : Torsten Augustsson; KTH; []
    Keywords : add drop-multiplexing; bragg gratings; de multiplexing; multimode interference waveguides; planar lightwave circuits; silica on silicon;

    Abstract : .... READ MORE