Prof. Astrid Aksnes Profile

Prof. Astrid Aksnes

Professor at Norwegian Univ of Science and Technology

SPIE Involvement:

Conference Program Committee | Author | Editor

Publications (26)

Proceedings Article | 31 May 2023 Presentation

On-chip trace gas sensing down to ppb levels with mid-IR spectroscopy

Jana Jágerská, Marek Vlk, Henock Yallew, Jehona Salaj, Sebastián Alberti, Jens Høvik, Astrid Aksnes

Proceedings Volume PC12575, PC1257505 (2023) https://doi.org/10.1117/12.2669176

KEYWORDS: Mid-IR, Spectroscopy, Waveguides, Thin films, Sensors, Optical properties, Methane, Light absorption, Laser spectroscopy, Industrial applications

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Proceedings Article | 22 May 2023 Presentation

Free-standing thin-film waveguide for PIC-based mid-IR trace gas sensing (Conference Presentation)

Jehona Salaj, Marek Vlk, Jens Høvik, Astrid Aksnes, Jana Jágerská

Proceedings Volume 12327, 123270S (2023) https://doi.org/10.1117/12.2645124

KEYWORDS: Waveguides, Thin films, Mid-IR, Photonic integrated circuits, Reactive ion etching, Waveguide sensors, Ultraviolet radiation, Tunable diode lasers, Sensors, Scattering

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Proceedings Article | 4 February 2022 Open Access

Feasibility of supercontinuum sources for use in glucose sensing by absorption spectroscopy (Erratum)

Silje Skeide Fuglerud, Karolina Milenko, Reinhold Ellingsen, Astrid Aksnes, Dag Roar Hjelme

Proceedings Volume 11073, 1107323 (2022) https://doi.org/10.1117/12.2632461

KEYWORDS: Glucose, Supercontinuum sources, Absorption spectroscopy, Sensing systems, Optical diagnostics, Biomedical optics, Absorption, Absorbance

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Proceedings Article | 20 August 2020 Presentation

Beam-steering lens arrays and ètendue-squeezing: a pathway towards a new class of solar concentrators?

Håkon Jarand Dugstad Johnsen, Astrid Aksnes, Jan Torgersen

Proceedings Volume 11495, 1149509 (2020) https://doi.org/10.1117/12.2567359

KEYWORDS: Solar concentrators, Nonimaging optics, Receivers, Sun, Tolerancing, Optical design, Illumination engineering

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Proceedings Article | 1 April 2020 Presentation + Paper

Signal enhancement in microstructured silicon attenuated total reflection elements with quantum cascade laser-based spectroscopy

Ine Jernelv, Jens Høvik, Dag Roar Hjelme, Astrid Aksnes

Proceedings Volume 11359, 113590A (2020) https://doi.org/10.1117/12.2554528

KEYWORDS: Attenuated total reflectance, Silicon, Quantum cascade lasers, Spectrometers, Glucose, FT-IR spectroscopy, Absorption, Spectroscopy, Sensors, Semiconducting wafers

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Proceedings Article | 20 February 2020 Paper

Mid-infrared spectroscopy with a fiber-coupled tuneable quantum cascade laser for glucose sensing

Ine Jernelv, Karina Strøm, Dag Roar Hjelme, Astrid Aksnes

Proceedings Volume 11233, 1123311 (2020) https://doi.org/10.1117/12.2543984

KEYWORDS: Glucose, Sensors, Signal to noise ratio, Spectroscopy, Mid-IR, Absorption, Error analysis, Absorbance, Quantum cascade lasers, Convolutional neural networks, Neural networks

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Proceedings Article | 9 September 2019 Presentation + Paper

Pushing the limits of beam-steering lens arrays

Håkon J. Johnsen, Astrid Aksnes, Jan Torgersen

Proceedings Volume 11120, 111200B (2019) https://doi.org/10.1117/12.2528751

KEYWORDS: Solar energy, Sun, Optical tracking, Solar concentrators, Light sources and illumination, Optical simulations, Antireflective coatings, Grayscale lithography, Optical arrays, Optical design

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Proceedings Article | 19 July 2019 Paper

Feasibility of supercontinuum sources for use in glucose sensing by absorption spectroscopy

Silje Fuglerud, Karolina Milenko, Reinold Ellingsen, Astrid Aksnes, Dag Hjelme

Proceedings Volume 11073, 110730E (2019) https://doi.org/10.1117/12.2524005

KEYWORDS: Glucose, Signal to noise ratio, Sensors, Spectroscopy, Oscilloscopes, Absorption spectroscopy, Near infrared, Light sources

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Proceedings Article | 18 September 2018 Paper

Sensitivity enhanced biophotonic sensor utilizing sub-wavelength gratings

Mukesh Yadav, Jens Høvik, Dag Roar Hjelme, Astrid Aksnes

Proceedings Volume 10729, 107290N (2018) https://doi.org/10.1117/12.2321165

KEYWORDS: Waveguides, Sensors, Interferometers, Modulation, Mach-Zehnder interferometers, Refractive index, Biomedical optics, Phase modulation, Finite element methods, Silicon

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Proceedings Article | 17 September 2018 Paper

Experimental validation of a 2D approximation method for investigating photonic components: case study refractive index sensor

Jens Høvik, Astrid Aksnes

Proceedings Volume 10743, 107430V (2018) https://doi.org/10.1117/12.2321121

KEYWORDS: Refractive index, Resonators, Waveguides, Silicon, Sensors, Wave propagation, Device simulation, Finite element methods, Tunable lasers

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Proceedings Article | 14 September 2018 Presentation + Paper

Solar tracking using beam-steering lens arrays

Håkon J. Johnsen, Jan Torgersen, Astrid Aksnes

Proceedings Volume 10758, 1075805 (2018) https://doi.org/10.1117/12.2320046

KEYWORDS: Solar energy, Solar concentrators, Collimation, Optimization (mathematics), Sun, Optical phase space, Optical tracking, Microlens array

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Proceedings Article | 5 September 2018 Presentation + Paper

Lab-on-a-chip photonic biosensor for detection of antigens

Jens Høvik, Mukesh Yadav, Nina Bjørk Arnfinnsdottir, Astrid Aksnes

Proceedings Volume 10728, 1072806 (2018) https://doi.org/10.1117/12.2321128

KEYWORDS: Resonators, Transducers, Lab on a chip, Photonic crystals, Waveguides, Biosensors, Diagnostics, Microfluidics

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Proceedings Article | 30 November 2012 Paper

Sensitivity limits of guided modes in silicon integrated waveguide-based sensors

Oleg Żero, Astrid Aksnes

Proceedings Volume 8561, 85610P (2012) https://doi.org/10.1117/12.999904

KEYWORDS: Waveguides, 3D modeling, Refractive index, Brain-machine interfaces, Electroluminescent displays, Sensors, Finite element methods, Silicon, Multimode interference devices, Polarization

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Proceedings Article | 6 February 2012 Paper

Performance of correlated speckle patterns for speckle reduction in laser projectors

Sigbjørn Egge, Ulf Österberg, Astrid Aksnes

Proceedings Volume 8280, 82800D (2012) https://doi.org/10.1117/12.905898

KEYWORDS: Speckle pattern, Speckle, Projection systems, Diffraction, Diffusers, Display technology, Current controlled current source, Imaging systems, Lamps, Diffraction gratings

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Proceedings Article | 2 February 2012 Paper

Investigation of parallel coupling mechanisms in silicon integrated chip sensors

Oleg Zero, Astrid Aksnes

Proceedings Volume 8266, 826604 (2012) https://doi.org/10.1117/12.906650

KEYWORDS: Waveguides, Sensors, Silicon, Refractive index, Directional couplers, 3D modeling, Finite element methods, Metals, Switching, Integrated optics

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SPIE Journal Paper | 1 September 2011 Open Access

Errata: Sinusoidal rotating grating for speckle reduction in laser projectors: feasibility study

Sigbjørn Egge, Kristine Welde, Ulf Oesterberg, Astrid Aksnes, M. Nadeem Akram, Zhaomin Tong, Vladimir Kartashov

OE, Vol. 50, Issue 09, 099801, (September 2011) https://doi.org/10.1117/12.10.1117/1.3640737

KEYWORDS: Speckle, Projection systems, Electronics, Telecommunications, Optical engineering, Microsystems, Laser applications

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SPIE Journal Paper | 1 August 2011

Sinusoidal rotating grating for speckle reduction in laser projectors: feasibility study

Sigbjørn Egge, Kristine Welde, Ulf Oesterberg, Astrid Aksnes, Nadeem Akram, Vladimir Kartashov, Zhaomin Tong

OE, Vol. 50, Issue 08, 083202, (August 2011) https://doi.org/10.1117/12.10.1117/1.3613937

KEYWORDS: Speckle, Diffraction, Spatial light modulators, Diffraction gratings, Speckle pattern, Diffusers, Projection systems, Phase shift keying, Modulation, Modulators

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Proceedings Article | 27 May 2011 Paper

Optical vibration measurements of cross coupling effects in capacitive micromachined ultrasonic transducer arrays

Erlend Leirset, Astrid Aksnes

Proceedings Volume 8082, 80823N (2011) https://doi.org/10.1117/12.889835

KEYWORDS: Transducers, Interferometers, Interfaces, Phase velocity, Acoustics, Signal attenuation, Heterodyning, Silicon, Ultrasonics, Velocity measurements

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Proceedings Article | 27 May 2011 Paper

Inspection of processes during silicon wafer sawing using low coherence interferometry in the near infrared wavelength region

Kay Gastinger, Lars Johnsen, Ove Simonsen, Astrid Aksnes

Proceedings Volume 8082, 80820U (2011) https://doi.org/10.1117/12.889498

KEYWORDS: Silicon, Spatial resolution, Silicon carbide, Solids, Interferometry, Interferometers, Semiconducting wafers, Near infrared, Image resolution, Inspection

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SPIE Journal Paper | 1 February 2011 Open Access

Hyperspectral imaging of atherosclerotic plaques in vitro

Eivind Larsen, Lise Randeberg, Astrid Aksnes, Lars Svaasand, Elisabeth Olstad, Olav Haugen

JBO, Vol. 16, Issue 02, 026011, (February 2011) https://doi.org/10.1117/12.10.1117/1.3540657

KEYWORDS: Luminescence, Hyperspectral imaging, Absorption, Principal component analysis, Reflectivity, Tissues, In vitro testing, Image classification, Image analysis, Foam

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Proceedings Article | 8 July 2009 Paper

Hyperspectral characterization of atherosclerotic plaques

Lise Randeberg, Eivind Larsen, Astrid Aksnes, Olav Haugen, Lars Svaasand

Proceedings Volume 7368, 736808 (2009) https://doi.org/10.1117/12.831624

KEYWORDS: Luminescence, Image filtering, Image classification, Hyperspectral imaging, Reflectivity, Library classification systems, Biopsy, Visualization, Absorption, Cameras

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Proceedings Article | 11 August 2008 Paper

Modeling and optical characterization of vibrating micro- and nanostructures

Astrid Aksnes, Erlend Leirset, Hanne Martinussen, Helge Engan

Proceedings Volume 7063, 70630H (2008) https://doi.org/10.1117/12.795061

KEYWORDS: Heterodyning, Interferometers, Finite element methods, Electrodes, Bragg cells, Transducers, Signal detection, Nanostructures, Silicon, Interferometry

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Proceedings Article | 18 June 2007 Paper

Interferometric characterization of capacitor micromachined ultrasonic transducers and validation by electrical measurements

Hanne Martinussen, Astrid Aksnes, Helge Engan, Arne Rønnekleiv

Proceedings Volume 6616, 661634 (2007) https://doi.org/10.1117/12.725863

KEYWORDS: Interferometers, Network security, Heterodyning, Transducers, Capacitors, Optical testing, Interferometry, Ultrasonics, Silicon, Temperature metrology

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Proceedings Article | 14 August 2006 Paper

Heterodyne interferometry for high sensitivity absolute amplitude vibrational measurements

Hanne Martinussen, Astrid Aksnes, Helge Engan

Proceedings Volume 6292, 62920Z (2006) https://doi.org/10.1117/12.679376

KEYWORDS: Signal detection, Transducers, Signal generators, Phase measurement, Heterodyning, Bragg cells, Interferometry, Interferometers, Sensors, Ferroelectric materials

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Proceedings Article | 14 August 2006 Paper

Characterization of acoustic vibrations on micro- and nanostructures with picometer sensitivity

Astrid Aksnes, Hanne Martinussen, Helge Engan

Proceedings Volume 6293, 62930A (2006) https://doi.org/10.1117/12.679381

KEYWORDS: Signal detection, Transducers, Ultrasonography, Heterodyning, Acoustics, Silicon, Nanostructures, Interferometers, Phase measurement, Sensors

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Proceedings Article | 24 April 1996 Paper

Electronic speckle pattern interferometry: new applications in biophysics

Astrid Dyrseth

Proceedings Volume 2676, (1996) https://doi.org/10.1117/12.238811

KEYWORDS: Water, Interferometry, Temperature metrology, Refractive index, Speckle pattern, Video, Speckle, Cameras, Translucency, Holographic interferometry

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