Blar i NTNU Open på forfatter "Aksnes, Astrid"
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New approaches to solar tracking and concentration through numerical optimization of lens arrays
Johnsen, Håkon Jarand Dugstad (Doctoral theses at NTNU;2020:405, Doctoral thesis, 2020)Solar concentrators are essential for enabling several solar energy applications, including high-efficiency photovoltaic conversion and high-temperature solar thermal energy. These concentrators require accurate solar ... -
On-chip refractive index sensors for lab-on-a-chip applications
Yadav, Mukesh (Doctoral theses at NTNU;2023:436, Doctoral thesis, 2023)Optical waveguide-based refractive index sensing is an emerging technology for the sensitive monitoring of molecular interactions. This technology could fulfill the requirements for “on-chip” detection in lab-on-a-chip ... -
Optical Detection of Surface Acoustic Waves
Rostad, Torbjørn (Master thesis, 2006)This project was worked on during the autumn 2005 at the Norwegian University of Science and Technology, Department of Electronics and Telecommunications. The assignment was to write a new LabVIEW programme that is to run ... -
Optical Measurements of Picovibrations on Capacitive Micromachined Ultrasonic Transducers
Åldstedt, Mats Marhaug (Master thesis, 2010)A research group at the Norwegian University of Science and Technology plan to integrate Capacitive Micromachined Ultrasonic Transducers (CMUTs) in a probe which can be used to image human blood vessels from the inside. ... -
Optimization and fabrication of a fiber-to-waveguide silicon-on-insulator grating coupler
Skrebergene, Lars Olav (Master thesis, 2020)Utviklingen av miniatyriserte laboratoriesystemer har blitt et viktig forskningsområde innen integrert fotonikk de siste årene. Mange av disse systemene baserer seg på lysmodulerende strukturer som krever tilstrekkelig med ... -
Optimization and Fabrication of Free-Standing Waveguides for Sensing Applications
Wiker, Petter (Master thesis, 2023)Utvikling av nye sensorssystemer for måling av sporgasser er av stor interesse blant annet innen forskning på klimautslipp, innen arbeid med biomedisin og -teknologi, og i overvåking av utslipp i industrielle miljø. Spesielt ... -
Optimization and Fabrication of Multiplexed Mach-Zehnder Interferometer-Assisted Ring Resonator Configuration (MARC) Photonic Sensors
Hovland, Espen (Master thesis, 2022)Fotoniske enheter basert på silisium-på-isolator (SOI)-plattformen har sett en økt interesse de siste årene, grunnet deres anvendelighet i fotoniske integrerte kretser (PICer). PICer er et godt utgangspunkt for applikasjoner ... -
Optimization and Fabrication of Photonic Crystal Drop Filters for Optical Biosensing
Røer, Eivind Jülke (Master thesis, 2019)Fotoniske krystaller kan bli brukt til å lage kompakte fotoniske komponenter. Frekvensfiltre basert på fotoniske krystaller blir i denne studien undersøkt for bruk som brytningsindeksbaserte biosensorer. Filteret undersøkt ... -
Optimization Of Photonic Crystal Ring Resonators For Label-Free Biosensing Purposes
Halvor R. Fergestad (Master thesis, 2019)Photonic crystals (PC) are materials with sub-wavelength permittivity variations. They exhibit interesting optical properties in terms of dispersion characteristics and light con- finement. Their optical properties are ... -
Optimization of SERS Sensing With Micro-Lensed Optical Fibers and Au Nano-Film
Milenko, Karolina Barbara; Fuglerud, Silje Skeide; Aksnes, Astrid; Ellingsen, Reinold; Hjelme, Dag Roar (Peer reviewed; Journal article, 2020)We present the fabrication and characterization of optical fiber reflection probes based on surface-enhanced Raman scattering (SERS) and micro-lensed multimode fibers. For the SERS substrate, a nano-sphere lithography ... -
Performance improvement in a supercontinuum fiber-coupled system for near infrared absorption spectroscopy
Schwermer, Silje Fuglerud; Noh, Jong Wook; Aksnes, Astrid; Hjelme, Dag Roar (Peer reviewed; Journal article, 2022)Accurate, in-field-compatible, sensing based on near infrared spectroscopy (NIRS) requires development of instrumentation with low noise and long-term stability. Here, we present a fully fiber-optic spectroscopy setup using ... -
Photonic crystal light emitting diode
Leirset, Erlend (Master thesis, 2010)This master's thesis describe electromagnetic simulations of a gallium antimonide (GaSb) light emitting diode, LED. A problem for such devices is that most of the generated light is reflected from the surface due to total ... -
Photonic Crystal Structures: Design and Fabrication
Lorvik, Marius (Master thesis, 2013)This thesis is devoted to the study of photonic crystal (PhC) design and fabrication. The design of a trigonal PhC waveguide is evaluated using finite element method (FEM) simulation software, and some considerations ... -
Photonic Crystal Waveguide Fabrication
Høvik, Jens (Master thesis, 2012)This research is entirely devoted to the study and fabrication of structures with periodic dielectric constants, also known as photonic crystals (PhCs). These structures show interesting dispersion characteristics which ... -
Pushing the limits of beam-steering lens arrays
Johnsen, Håkon Jarand Dugstad; Aksnes, Astrid; Torgersen, Jan (Journal article; Peer reviewed, 2019)An essential part of a concentrated solar power system is the solar tracker. Tracking is usually implemented by rotating the entire optical system to follow the sun, adding to the bulk and complexity of the system. ... -
Quantum Cascade Laser for Spectroscopic Gas Detection
Sletbakk, Bjørn (Master thesis, 2007)In this project it has been focused on the use of a 7.42 um, 4 mW Quantum Cascade Laser in trace gas detection spectroscopy. Norsk Elektro Optikk (NEO) is in possession of a Nanoplus G2102/DFB2/5-12 QCL laser, that can be ... -
Reduction of speckle contrast in HDTV laser projection display.
Apeland, Knut Øyvind (Master thesis, 2008)Abstract In this thesis the focus has been on laser speckle. It is done in collaboration with poLight. They are developing a projector, where laser light is the source of illumination. In such projectors, laser speckle ... -
Reduction of speckle contrast in laser based HDTV projection displays
Lifjeld, Anders (Master thesis, 2007)In this assignment the theoretical background for the nature of speckle is presented and practical work was done to reduce the speckle effect in a display system based on a laser source. This was done without any picture ... -
Signal enhancement in microstructured silicon attenuated total reflection elements with quantum cascade laser-based spectroscopy
Jernelv, Ine Larsen; Høvik, Jens; Hjelme, Dag Roar; Aksnes, Astrid (Peer reviewed; Journal article, 2020)Sensors in mid-infrared spectroscopy based on attenuated total reflection (ATR) sensing with internal reflection elements (IREs) facilitate easier measurements of aqueous solutions or other opaque analytes. Micromachined ... -
Silicon Nitride Waveguide Mach-Zehnder Interferometer Biosensor - Processing of a Biosensor and Investigation of Biofunctionalization
Hage, Morten (Master thesis, 2016)The main part of the project is devoted to processing of a MZI waveguide structure using silicon on insulator technology which is carried out at the NTNU NanoLab. MZI is a common interferometry technique that suits bio-sensing ...