Blar i NTNU Open på forfatter "Grepstad, Jon Olav"
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Detection of single nano-defects in photonic crystals between crossed polarizers
Grepstad, Jon Olav; Kaspar, Peter; Johansen, Ib-Rune; Solgaard, Olav; Sudbø, Aasmund (Peer reviewed; Journal article, 2013)We investigate, by simulations and experiments, the light scattering of small particles trapped in photonic crystal membranes supporting guided resonance modes. Our results show that, due to amplified Rayleigh small particle ... -
Finite-size limitations on quality factor of guided resonance modes in 2D photonic crystals
Grepstad, Jon Olav; Greve, Martin Møller; Holst, Bodil; Johansen, Ib-Rune; Solgaard, Olav; Sudbø, Aasmund (Journal article; Peer reviewed, 2013)High-Q guided resonance modes in two-dimensional photonic crystals, enable high field intensity in small volumes that can be exploited to realize high performance sensors. We show through simulations and experiments how ... -
Patterned Dielectric Membranes Designed for Optical Sensing of Nano-Particles
Grepstad, Jon Olav (Doktoravhandlinger ved NTNU, 1503-8181; 2014:108, Doctoral thesis, 2014)Preventive action by early detection of disease has been identified as one of the best means of improving health care. This has created a demand for high-sensitivity biosensors. By detecting low levels of disease specific ... -
Photonic-crystal membranes for optical detection of single nano-particles, designed for biosensor application
Grepstad, Jon Olav; Kaspar, Peter; Solgaard, Olav; Johansen, Ib-Rune; Sudbø, Aasmund (Peer reviewed; Journal article, 2012)A sensor designed to detect bio-molecules is presented. The sensor exploits a planar 2D photonic crystal (PC) membrane with sub-micron thickness and through holes, to induce high optical fields that allow detection of ... -
Total internal reflection and evanescent gain
Grepstad, Jon Olav; Skaar, Johannes (Journal article; Peer reviewed, 2011)Total internal reflection occurs for large angles of incidence, when light is incident from a high-refractive-index medium onto a low-index medium. We consider the situation where the low-index medium is active. By invoking ... -
Tynnfilmepitaksi ved pulset laserdeponering av SrRuO3: En vekstparameterstudie
Grepstad, Jon Olav (Master thesis, 2007)Tynnfilmepitaksi ved pulset laserdeponering av SrRuO3 på TiO2-terminert (001)-orientert SrTiO3-substrat, er i dette arbeidet undersøkt over et stort spekter av deponeringssystemets vekstparametere. Veksten er overvåket ved ...