Browsing Institutt for fysikk by Title
Now showing items 1024-1043 of 2707
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Graphene mode-locked Cr:ZnS laser with 44 fs pulse duration
(Chapter, 2013)The first Cr:ZnS laser mode-locked by graphene-based saturable absorber mirror generates the shortest reported so far mid-IR pulses of only 5.5 optical cycles (44 fs) at 2.35 μm with 139 nm spectral bandwidth. -
Graphene Saturable Absorber Mirrors for 2-3 μm Lasers
(Master thesis, 2018)This thesis is devoted to the development of graphene saturable absorber mirrors for ultrafast applications in the mid-infrared. It covers from the fabrication of the graphene saturable absorber mirrors via graphene transfer ... -
Graphene-based extremely wide-angle tunable metamaterial absorber
(Journal article; Peer reviewed, 2016)We investigate the absorption properties of graphene-based anisotropic metamaterial structures where the metamaterial layer possesses an electromagnetic response corresponding to a near-zero permittivity. We find that ... -
Graphene-Based Transparent Conducting Substrates for GaN/AlGaN Nanocolumn Flip-Chip Ultraviolet Light-Emitting Diodes
(Journal article; Peer reviewed, 2021)Flip-chip ultraviolet light-emitting diodes based on self-assembled GaN/AlGaN nanocolumns have been fabricated, exploiting single-layer graphene not only as a growth substrate but also as a transparent conducting electrode. ... -
Graphene-mode-locked Holmium Fiber Laser Operating Beyond 2.1 µm
(Chapter, 2015) -
Gravitational waves
(Master thesis, 2022)I denne oppgaven vil vi først se den svake feltgrensen til Einsteins feltligninger og den grunnleggende formalismen for gravitasjonelle bølger i den lineariserte teorien. Videre vil vi ta et skritt utenfor den lineariserte ... -
Gravity Wave Climatology for Trondheim using a Meteor Radar.
(Master thesis, 2013)In this thesis, a gravity wave climatology for the altitude range of the airglow (hydroxyl) layer of 83 to 91km have been made using data from a meteor radar located at Dragvoll (64,4$^{o}$N, 10,5$^{o}$E) in Trondheim. The ... -
Gravity Wave Refraction in the Atmosphere:: Ray tracing versus Geometric Location from a Single Image
(Master thesis, 2013)This thesis presents two methods of finding the sources of gravity waves observed in the night-time hydroxyl airglow; ray-tracing and geometric localisation by fitting concentric circles onto the curvature of the gravity ... -
Green’s Function Approach to Quantum Phenomena in Heterostructures with Spin- Polarization and Coherence
(Doctoral theses at NTNU;2023:238, Doctoral thesis, 2023)Kvantemekanikken som muliggjør fremtidens informasjonsteknologi Moderne datamaskiner produserer en mengde varme som er sammenlignbart med varmen fra panelovner. Denne varmeproduksjonen, sammen med utfordringer relatert ... -
Ground-Based UV Measurements, Aerosol Effects on UV Radiation
(Doktoravhandlinger ved NTNU, 1503-8181; 2009:39, Doctoral thesis, 2009) -
Growth and Characterization of Germanium Quantum Dots and Crystalline Silicon
(Master thesis, 2011)Germanium quantum dots in a silicon matrix can be used in so-called intermediate band solar cells. Such solar cells have efficiency limits exceeding that of the conventional single junction solar cells. In this master ... -
Growth and characterization of ZnO thin films to be utilized inorganic/inorganic solar cells
(Master thesis, 2009) -
Growth kinetics and structure of a colloidal silica-based network: in situ RheoSAXS investigations
(Journal article; Peer reviewed, 2024)Silica gels have a multitude of applications ranging from cosmetics and food science to oil and gas recovery. For proper design and application, it is important to have a thorough understanding of the underlying mechanisms ... -
Growth study of self-assembled GaN nanocolumns on silica glass by plasma assisted molecular beam epitaxy
(Journal article; Peer reviewed, 2017)We demonstrate GaN nanocolumn growth on fused silica glass by plasma-assisted molecular beam epitaxy. The effect of the substrate temperature, Ga flux and N2 flow rate on the structural and optical properties are studied. ... -
Grunnleggende elektrisitetsforståelse blant førsteårs-studentene ved studieprogrammene elektronisk systemdesign og innovasjon og kybernetikk og robotikk ved NTNU
(Master thesis, 2021)I denne studien er det forsøkt å besvare problemstillingen: Hva kjennetegner den grunnleggende elektrisitetsforståelsen til førsteårsstudenter ved studieprogrammene elektronisk systemdesign og innovasjon og kybernetikk og ... -
HAADF-STEM and DFT investigations of the Zn-containing β'' phase in Al-Mg-Si alloys
(Journal article, 2014)The Zn-containing β″ phase in Al–Mg–Si alloys was investigated by aberration corrected high angle annular dark-field scanning transmission electron microscopy (HAADF-STEM), combined with density functional theory (DFT) ... -
Handling Discontinuities in Numerical ODE Methods
(Master thesis, 2021)Et vanlig ønske i mange typer arbeid er å finne den fremgangsmåten som gir best resultat uten å kreve for mye innsats. For eksempel så krever modellering av hvordan forurensende stoffer sprer seg i havet at man beregner ... -
Hardness and Microstructure for Ge-Containing Al-Mg-Si-Cu alloys
(Master thesis, 2012)Four different Al-Mg-Si-Cu-Ge alloys with 0.002--0.037 at.\% germanium were heat treated to the T6 condition and over-aged at 250$^{\circ}$C for up to 100 hours. The hardness was tested during the over-ageing and there ... -
Harnessing thermoelectric power from transient heat sources: Waste heat recovery from silicon production
(Journal article; Peer reviewed, 2017)Thermoelectric generators (TEGs) are compact and robust devices for converting heat into electrical power. In this work, we investigate the response of a bismuth-telluride based TEG to the transient environment of a silicon ...