Blar i NTNU Open på forfatter "Aksnes, Astrid"
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Silicon Photonic Components: Characterization and Optimization of Fabrication
Martinussen, Simen Mikalsen (Master thesis, 2015)Photonics is the science of manipulating photons, and silicon photonics is the application of silicon as the optical medium. It leverages the vast body of knowledge about semiconductor manufacturing and the established use ... -
Silisium Racetrack Resonator: Design og Fabrikasjon
Vigen, Leidulv (Master thesis, 2014)Microfotonikk er en undergren av fotonikk rettet mot integrerte systemer på en enkelt halvlederbrikke. Det innebærer utforming, fabrikasjon og testing av optiske komponenter som skal fabrikkeres på mikro-eller nanonivå. ... -
Simulation and Characterization of Mesoporous Optical Rib Waveguides for use in Near Infrared Liquid Sensing
Thiis, Selma Tofte (Master thesis, 2023)Den økende etterspørselen etter effektive biomedisinske sensorer har ført til utvikling av lab-on-a-chip (LOC) fotoniske måleenheter. Dermed har optiske bølgeledere, tradisjonelt brukt til signaloverføring, i økende grad ... -
Simulation and Fabrication of a Photonic Crystal Mach-Zehnder Interferometer
Holmen, Lars Grønmark (Master thesis, 2016)Photonic crystals (PhC) are materials with extraordinary optical properties in terms of dispersion characteristics and light confinement, which make them a promising platform for photonic integrated circuits. This study ... -
Simulation and Fabrication of a Photonic Crystal Transmission Filter for Biosensing Applications
Lien, Størk (Master thesis, 2018)Photonic crystals are artificial materials with periodicity in the dielectric function on the sub-micron scale. They can exhibit extraordinary light confining properties superior to other known materials, making them ... -
Simulation and Fabrication of Mach-Zehnder\newline Interferometer-Assisted Ring\newline Resonator Configuration (MARC) Photonic Sensors
Moe, Steffen Emil Snippen (Master thesis, 2023)Fotoniske enheter basert på silisium-på-isolator (SPI) teknologi har blitt grundig studert de siste årene på grunn av deres bruk i fotoniske integrerte kretser (FIK). Denne teknologien kan benyttes innen biosensorer for å ... -
Simulation and fabrication of two-dimensional photonic crystal drop filters for biosensing
Hellen, Ingerid Gjeitnes (Master thesis, 2018)The main goal of this master thesis was to design and fabricate a biosensor consisting of a 2D photonic crystal. Its periodicity was made by etching a hexagonal hole pattern in a silicon slab, and a few linear defects were ... -
Simulations and Fabrication of Photonic Crystal Waveguides and a Computational Study of Two-Dimensional Photonic Crystal Cavity Resonators
Stein, Mia Othelie (Master thesis, 2018)Photonics crystals are artificially made materials with a periodic dielectric constant where the size of the periodicity is comparable to the wavelength of light. These structures have a huge potential for on-chip applications ... -
Solar tracking using beam-steering lens arrays
Johnsen, Håkon Jarand Dugstad; Torgersen, Jan; Aksnes, Astrid (Chapter, 2018)Conventional tracking solar concentrators track sunlight by rotating the concentrator optics to face the sun, which adds to the cost and bulk of the system. Beam-steering lens arrays, in contrast, allow solar tracking ... -
Spectral shaping of ring resonator transmission response
Yadav, Mukesh; Noh, Jong Wook; Hjelme, Dag Roar; Aksnes, Astrid (Peer reviewed; Journal article, 2021)We present a Mach-Zehnder interferometer assisted ring resonator configuration (MARC) to realize resonator transmission spectra with unique spectral signatures and significantly large effective free spectral ranges. ... -
Sub-ppm Methane Detection with Mid-Infrared Slot Waveguides
Yallew, Henock Demessie; Vlk, Marek; Datta, Anurup; Alberti, Sebastian; Zakoldaev, Roman A.; Høvik, Jens; Aksnes, Astrid; Jagerska, Jana (Journal article; Peer reviewed, 2023)Hybrid integration of photonic chips with electronic and micromechanical circuits is projected to bring about miniature, but still highly accurate and reliable, laser spectroscopic sensors for both climate research and ... -
Surface-Enhanced Absorption Spectroscopy for Optical Fiber Sensing
Fuglerud, Silje Skeide; Milenko, Karolina Barbara; Aksnes, Astrid; Hjelme, Dag Roar (Peer reviewed; Journal article, 2020)Visible and near-infrared spectroscopy are widely used for sensing applications but suffer from poor signal-to-noise ratios for the detection of compounds with low concentrations. Enhancement by surface plasmon resonance ... -
Surface-Enhanced Raman Scattering for Biosensor Probes
Kjeldby, Snorre Braathen (Master thesis, 2018)In this work, several possible configurations of a glucose biosensor based on surface-enhanced Raman scattering (SERS) were investigated. The glucose biosensor is intended for measurements of blood glucose levels in ... -
Towards Fiber-Optic Raman Spectroscopy for Glucose Sensing
Milenko, Karolina Barbara; Larsen Jernelv, Ine; Fuglerud, Silje Skeide; Aksnes, Astrid; Ellingsen, Reinold; Hjelme, Dag Roar (Chapter, 2018)We demonstrate a multimode optical fiber sensor for spectroscopic Raman measurements of glucose concentration for the application in intraperitoneal glucose detection in diabetic patients. A regression model with a RMSEC ... -
Tuneable Diode Laser Absorption Spectroscopy with Optical Fiber: Noise Analysis and Noise Reduction
Dang, Dung Do (Master thesis, 2006)A prototype of a fiber based absorptionspectroscopy instrument is built. A single mode fiber pigtailDistributed Feedback laser (DFB) is used to scan a known$mbox{NH}_3$ absorption line near $1512nm$ ($6614cm^{-1}$). ... -
Vernier enhanced Mach Zehnder interferometer for dissolved methane detection
Mariero, Magnus (Master thesis, 2016)In this thesis the theory describing a vernier enhanced Mach Zehnder interferometer for detecting dissolved methane is discussed. A method for effectively simulating photonic components, with features ranging from centimeter ... -
Waveguide asymmetric long-period grating couplers as refractive index sensors
Høvik, Jens; Yadav, Mukesh; Noh, Jong Wook; Aksnes, Astrid (Peer reviewed; Journal article, 2020)A highly sensitive integrated photonic transducer is designed by utilizing asymmetric long-period gratings on a silicon waveguide. These gratings are formed by periodic perturbation of the waveguide width, leading to ... -
Wide frequency range measurements of absolute phase and amplitude of vibrations in micro- and nanostructures by optical interferometry
Martinussen, Hanne; Aksnes, Astrid; Engan, Helge Emil (Journal article; Peer reviewed, 2007)A heterodyne interferometer has been built in order to characterize vibrations on micro- and nanostructures. The interferometer offers the possibility of both absolute phase and high resolution absolute amplitude vibrational ... -
Wireless MEMS Accelerometer with Nanoampere Current Consumption for the Internet of Things
Gjertsen, Jonathan Reichelt (Master thesis, 2018)Sensors are a key part of the Internet of Things (IoT). Accelerometers are particularly versatile, since knowledge about the motion of an object can be used for a large number of applications. Nearly all commercially ...