Browsing by Subject "Light"

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  • 3D geometry measurement of hot cylindric specimen using structured light 
    Quentin, Lorenz; Beermann, Rüdiger; Pösch, Andreas; Reithmeier, Eduard; Kästner, Markus (Bellingham, Wash. : SPIE, 2017)
    We present a fringe projection system to measure glowing hot hybrid components in between production processes. For this a high power green light projector, based on TI DLP technology, is used to create the highest possible ...
  • Additive manufacturing of reflective optics: Evaluating finishing methods 
    Leuteritz, Georg; Lachmayer, Roland (Bellingham, WA : SPIE - International Society for Optical Engineering, 2018)
    Individually shaped light distributions become more and more important in lighting technologies and thus the importance of additively manufactured reflectors increases significantly. The vast field of applications ranges ...
  • Biofunctional quantum dots as fluorescence probe for cell-specific targeting 
    Ag, Didem; Bongartz, Rebecca; Dogan, Leyla Eral; Seleci, Muharrem; Walter, Johanna-Gabriela; Demirkol, Dilek Odaci; Stahl, Frank; Ozcelik, Serdar; Timur, Suna; Scheper, Thomas (Amsterdam : Elsevier, 2014)
    We describe here the synthesis, characterization, bioconjugation, and application of water-soluble thioglycolic acid TGA-capped CdTe/CdS quantum dots (TGA-QDs) for targeted cellular imaging. Anti-human epidermal growth ...
  • Calculation comparison of an additive and subtractive light modulator for high-resolution pixellight headlamps 
    Held, Marcel Philipp; Ley, Peer-Phillip; Lachmayer, Roland (Bellingham, Wash. : SPIE, 2018)
    High-resolution vehicle headlamps represent a future-oriented technology that increases traffic safety and driving comfort in the dark. A further development to current matrix beam headlamps are LED-based pixellight systems ...
  • Cell differentiation based on absorption and scattering 
    Eisert, Wolfgang G. (London : SAGE Publications Ltd., 1979)
    Improvements of the flow system allow calibrated cell length measurements down to less than 2 μm at a very high rate. An optical index match to plane viewing windows perpendicular to the optical axis in the flow system ...
  • Characterization of a time-resolved non-contact scanning diffuse optical imaging system exploiting fast-gated single-photon avalanche diode detection 
    Di Sieno, Laura; Wabnitz, Heidrun; Pifferi, Antonio; Mazurenka, Mikhail; Hoshi, Yoko; Dalla Mora, Alberto; Contini, Davide; Boso, Gianluca; Becker, Wolfgang; Martelli, Fabrizio; Tosi, Alberto; Macdonald, Rainer (College Park : American Institute of Physics, 2016)
    We present a system for non-contact time-resolved diffuse reflectance imaging, based on small source-detector distance and high dynamic range measurements utilizing a fast-gated single-photon avalanche diode. The system ...
  • A common histone modification code on C4 genes in maize and its conservation in sorghum and setaria Italica 
    Heimann, Louisa; Horst, Ina; Perduns, Renke; Dreesen, Björn; Offermann, Sascha; Peterhansel, Christoph (Oxford : Oxford University Press, 2013)
    C4 photosynthesis evolvedmore than 60 times independently in different plant lineages. Each time,multiple genes were recruited into C4 metabolism. The corresponding promoters acquired new regulatory features such as high ...
  • Compensation of adverse growing media effects on plant growth and morphology by supplemental LED lighting 
    Solbach, Jan Andreas; Fricke, Andreas; Stützel, Hartmut (San Francisco, California, US : PLOS, 2023)
    There is an increasing interest in alternatives to peat in growing media due to environmental constraints. However, plants grown in peat substitutes often show impaired growth compared to plants grown in peat-based media. ...
  • Determination of the collection diffusion length by electroluminescence imaging 
    Schinke, Carsten; Hinken, David; Bothe, Karsten; Ulzhöfer, Christian; Milsted, Ashley; Schmidt, Jan; Brendel, Rolf (Amsterdam : Elsevier BV, 2011)
    The electroluminescence emission of crystalline silicon solar cells at near-bandgap wavelengths is investigated. We show that the intensity of the emitted luminescence at near-bandgap wavelengths is directly proportional ...
  • Efficient conceptual design for LED-based pixel light vehicle headlamps 
    Held, Marcel Philipp; Lachmayer, Roland (Bellingham, Wash. : SPIE, 2017)
    High-resolution vehicle headlamps represent a future-oriented technology that can be used to increase traffic safety and driving comfort. As a further development to the current Matrix Beam headlamps, LED-based pixel light ...
  • Evaluating carbon dots as electron mediators in photochemical and photocatalytic processes of NiFe2O4 
    Ombaka, Lucy M.; Dillert, Ralf; Robben, Lars; Bahnemann, Detlef W. (College Park : American Institute of Physics, 2020)
    Spinel ferrites such as nickel ferrite are promising energy conversion photocatalysts as they are visible-light absorbers, chemically stable, earth abundant, and inexpensive. Nickel ferrite shows poor photocatalytic activity ...
  • Experimental setup for camera-based measurements of electrically and optically stimulated luminescence of silicon solar cells and wafers 
    Hinken, David; Schinke, Carsten; Herlufsen, Sandra; Schmidt, Arne; Bothe, Karsten; Brendel, Rolf (College Park, MD : American Institute of Physics, 2011)
    We report in detail on the luminescence imaging setup developed within the last years in our laboratory. In this setup, the luminescence emission of silicon solar cells or silicon wafers is analyzed quantitatively. Charge ...
  • Interspecific variation in leaf traits, photosynthetic light response, and whole-plant productivity in amaranths (Amaranthus spp. L.) 
    Osei-Kwarteng, Mildred; Moualeu-Ngangue, Dany; Buck-Sorlin, Gerhard; Stützel, Hartmut (San Francisco, California, US : PLOS, 2022)
    Photosynthetic light response curve parameters help us understand the interspecific variation in photosynthetic traits, leaf acclimation status, carbon uptake, and plant productivity in specific environments. These parameters ...
  • Light section measurement to quantify the accuracy loss induced by laser light deflection in an inhomogeneous refractive index field 
    Beermann, Rüdiger; Quentin, Lorenz; Pösch, Andreas; Reithmeier, Eduard; Kästner, Markus (Bellingham, Wash. : SPIE, 2017)
    In the manufacturing process of Tailored Forming components, the inline inspection of the joining zone directly after each single process step can yield advantages - such as early error detection and real-time process ...
  • Lightweight metasurface mirror of silicon nanospheres [Invited] 
    Evlyukhin, A.B.; Matiushechkina, M.; Zenin, V.A.; Heurs, Michèle; Chichko, B.N. (Washington, DC : The Optical Society, 2020)
    Many experiments in modern quantum optics require the implementation of lightweight and near-perfect reflectors for noise reduction and high sensitivity. Another important application of low mass and high reflectivity ...
  • Low-cost fabrication of optical waveguides, interconnects and sensing structures on all-polymer-based thin foils 
    Rezem, Maher; Kelb, Christian; Günther, Axel; Rahlves, Maik; Reithmeier, Eduard; Roth, Bernhard (Bellingham, Wash. : SPIE, 2016)
    Micro-optical sensors based on optical waveguides are widely used to measure temperature, force and strain but also to detect biological and chemical substances such as explosives or toxins. While optical micro-sensors ...
  • Luminescence emission from forward- and reverse-biased multicrystalline silicon solar cells 
    Bothe, Karsten; Ramspeck, K.; Hinken, D.; Schinke, Carsten; Schmidt, J.; Herlufsen, S.; Brendel, Rolf; Bauer, J.; Wagner, J.-M.; Zakharov, N.; Breitenstein, O. (College Park, MD : American Institute of Physics, 2009)
    We study the emission of light from industrial multicrystalline silicon solar cells under forward and reverse biases. Camera-based luminescence imaging techniques and dark lock-in thermography are used to gain information ...
  • Matrix heater in the gravitational wave observatory GEO 600 
    Wittel, H.; Affeldt, Christoph; Bisht, A.; Doravari, S.; Grote, Hartmut; Lough, J.; Lück, Harald; Schreiber, E.; Strain, K.A.; Danzmann, Karsten (Washington, DC : Optical Society of America, 2018)
    Large scale laser interferometric gravitational wave detectors (GWDs), such as GEO 600 require high quality optics to reach their design sensitivity. The inevitable surface imperfections, inhomogeneities, and light-absorption ...
  • Mechanistic insights into plasmonic photocatalysts in utilizing visible light 
    Leong, Kah Hon; Aziz, Azrina Abd; Sim, Lan Ching; Saravanan, Pichiah; Jang, Min; Bahnemann, Detlef W. (Frankfurt am Main : Beilstein-Institut zur Förderung der Chemischen Wissenschaften, 2018)
    The utilisation of sunlight as an abundant and renewable resource has motivated the development of sustainable photocatalysts that can collectively harvest visible light. However, the bottleneck in utilising the low energy ...
  • Modeling of photoluminescence in laser-based lighting systems 
    Chatzizyrli, Elisavet; Tinne, Nadine; Lachmayer, Roland; Neumann, Jörg; Kracht, Dietmar (Bellingham, Wash. : SPIE, 2017)
    The development of laser-based lighting systems has been the latest step towards a revolution in illumination technology brought about by solid-state lighting. Laser-activated remote phosphor systems produce white light ...