Search for dissertations about: "photonics"

Showing result 21 - 25 of 201 swedish dissertations containing the word photonics.

  2. 21. Theoretical studies of microcavities and photonic crystals for lasing and waveguiding applications

    Author : Aliaksandr Rahachou; Igor Zozoulenko; Min Qiu; Linköpings universitet; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; photonic crystals; microcavities; microlasers; scattering matrix; Green s function; Photonics; Fotonik;

    Abstract : This Licentiate presents the main results of theoretical study of light propagation in photonic structures, namely lasing disk microcavities and photonic crystals. In the first two papers (Paper I and Paper II) we present the developed novel scattering matrix technique dedicated to calculation of resonant states in 2D disk microcavities with the imperfect surface or/and inhomogeneous refractive index. READ MORE

  4. 22. Dispersion Engineering : Negative Refraction and Designed Surface Plasmons in Periodic Structures

    Author : Zhichao Ruan; Min Qiu; Henri Benisty; KTH; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; photonic crystal; dispersion property; negative refraction; surface plasmon polariton; designed surface plasmon; negative index material; layer-KKR method; finite-difference time-domain method; plane wave method; subwavelength imaging; open cavity; enhanced transmission; slowing light; Photonics; Fotonik;

    Abstract : The dispersion property of periodic structures is a hot research topic in the last decade. By exploiting dispersion properties, one can manipulate the propagation of electromagnetic waves, and produce effects that do not exist in conventional materials. READ MORE

  5. 23. Design, Simulation and Characterization of Some Planar Lightwave Circuits

    Author : Yaocheng Shi; Anand Srinivasan; Sailing He; Daniel Erni; KTH; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; planar lightwave circuit; waveguide; coupler; multimode interference; photonic crystal waveguide; de multiplexer; triplexer; polarization beam splitter; dry etching; carrier life time.; Photonics; Fotonik;

    Abstract : Optical devices based on planar lightwave circuit (PLC) technology have the advantages of small size, high reliability, possibility for large scale production, and potential integration with electronics. These devices are widely employed in optical telecommunications, sensing, data storage, imaging, and signal processing. READ MORE

  6. 24. Simulation of Electro-Optic Modulators by a Time-Domain Beam-Propagation Method

    Author : Elin Solberg; Göteborgs universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; time-domain beam-propagation method; finite element method; tensor products; computational electromagnetics; photonics; electro-optic modulators; finite element method;

    Abstract : Electro-optic modulators (EOMs) are components which convert electric signals to optical ones. They are needed, e.g., at the transmitter end of fiber-optic communication systems and in time-stretch analog-to-digital converters. READ MORE

  7. 25. Electromagnetic simulation and design of etched diffraction grating demultiplexers

    Author : Jun Song; Sailing He; Dries Van Thourhout; KTH; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; etched diffraction grating; wavelength division multiplexing; passive devices; diffraction grating; planar waveguide devices; DWDM; optical communication.; Photonics; Fotonik;

    Abstract : Among various planar lightwave circuits for multiplexing/demultiplexing in an optical communication system, etched diffraction gratings (EDGs) have shown great potential due to their compactness and high spectral finesse. Conventional numerical methods for grating simulation cannot be used to simulate an EDG demultiplexer of large size (in terms of the wavelength). READ MORE