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Lars Egil Helseth's picture

Lars Egil Helseth

Professor
Department of Physics and Technology
  • E-mailLars.Helseth@uib.no
  • Phone+47 55 58 83 07
  • Visitor Address
    Allegaten 55
    Bergen
    Room 
    206
  • Postal Address
    Postboks 7803
    5020 BERGEN

1) Electromagnetic fields.

2) Optical sensors and imaging systems.

3) Statistical physics of microstructures.

4) Renewable energy resources.

 

 

Journal articles
  • Frøvik, Nikolai; Greve, Martin Møller; Helseth, Lars Egil. 2019. Nanostructures and wetting properties controlled by reactive ion etching of fluorinated ethylene propylene. Colloids and Surfaces A: Physicochemical and Engineering Aspects. 574: 228-238. doi: 10.1016/j.colsurfa.2019.04.086
  • Helseth, Lars Egil. 2019. Modelling supercapacitors using a dynamic equivalent circuit with a distribution of relaxation times. Journal of Energy Storage. 25. 7 pages.
  • Helseth, Lars Egil. 2019. The influence of microscale surface roughness on water-droplet contact electrification. Langmuir. 35: 8268-8275. doi: 10.1021/acs.langmuir.9b00988
  • Helseth, Lars Egil. 2019. Superhydrofobe overflater. Naturen. 2. 66-69.
  • Helseth, Lars Egil. 2019. Kan vi energieffektivisere oss til en bedre fremtid? Forskning.no : nettavis med nyheter fra norsk og internasjonal forskning. Published 2019-01-29.
  • Helseth, Lars Egil. 2019. Triboelectric proximity and contact detection using soft planar spiral electrodes. Smart materials and structures (Print). 28: 1-9.
  • Helseth, Lars Egil. 2018. Electrical impedance spectroscopy of multiwall carbon nanotube–PDMS composites under compression. Materials Research Express. 5: 1-11. doi: 10.1088/2053-1591/aada3c
  • Helseth, Lars Egil. 2018. Simple fabrication of a multiwall carbon nanotube – elastomer composite with a rough surface and its application in force sensing. Microelectronic Engineering. 199: 106-113. doi: 10.1016/j.mee.2018.08.001
  • Helseth, Lars Egil. 2018. Flytende metalledninger for bøyelig elektronikk. Fra Fysikkens Verden. 80: 40-41.
  • Helseth, Lars Egil. 2018. Interdigitated electrodes based on liquid metal encapsulated in elastomer as capacitive sensors and triboelectric nanogenerators. Nano Energy. 50: 266-272. doi: 10.1016/j.nanoen.2018.05.047
  • Helseth, Lars Egil. 2017. How to make a soft, rough surface transparent. Physics Education. 52. doi: 10.1088/1361-6552/aa80a5
  • Helseth, Lars Egil. 2017. Optical force sensing principle based on transparent elastomer with a rough surface. Sensors and Actuators A-Physical. 263: 667-676. doi: 10.1016/j.sna.2017.07.033
  • Helseth, Lars Egil; Wen, Hanzhen. 2017. Corrigendum to "Evaluation of the energy generation potential of rain cells" [Energy 119 (2017) 472-482] (S0360544216319028) (10.1016/j.energy.2016.12.097). Energy. 127: 804-804. doi: 10.1016/j.energy.2017.04.054
  • Helseth, Lars Egil; Wen, Hanzhen. 2017. Visualisation of charge dynamics when water droplets move off a hydrophobic surface. European journal of physics. 38:055804: 1-8. doi: 10.1088/1361-6404/aa82f7
  • Helseth, Lars Egil; Wen, Hanzhen. 2017. Evaluation of the energy generation potential of rain cells. Energy. 119: 472-482. doi: 10.1016/j.energy.2016.12.097
  • Helseth, Lars Egil. 2016. Electrical energy harvesting from water droplets passing a hydrophobic polymer with a metal film on its back side. Journal of Electrostatics. 81: 64-70. doi: 10.1016/j.elstat.2016.03.006
  • Helseth, Lars Egil. 2016. Thomsons dråpegenerator og visualisering av ladningsoverføring. Fra Fysikkens Verden. 78: 84-87.
  • Helseth, Lars Egil; Guo, Xiaodong. 2016. Triboelectric motion sensor combined with electromagnetic induction energy harvester. Sensors and Actuators A-Physical. 246: 66-72. doi: 10.1016/j.sna.2016.05.020
  • Helseth, Lars Egil; Guo, Xiaodong. 2016. Hydrophobic polymer covered by a grating electrode for converting the mechanical energy of water droplets into electrical energy. Smart materials and structures (Print). 25:045007. 12 pages. doi: 10.1088/0964-1726/25/4/045007
  • Helseth, Lars Egil; Guo, Xiaodong. 2016. Fluorinated ethylene propylene thin film for water droplet energy harvesting. Renewable Energy. 99: 845-851. doi: 10.1016/j.renene.2016.07.077
  • Guo, Xiaodong; Dai, Ye; Gong, Mingjun; Qu, Yuangao; Helseth, Lars Egil. 2015. Changes in wetting and contact charge transfer by femtosecond laser-ablation of polyimide. Applied Surface Science. 349: 952-956. doi: 10.1016/j.apsusc.2015.05.089
  • Guo, Xiaodong; Helseth, Lars Egil. 2015. Optical and wetting properties of nanostructured fluorinated ethylene propylene changed by mechanical deformation and its application in triboelectric nanogenerators. Materials Research Express. 2. doi: doi:10.1088/2053-1591/2/1/015302
  • Guo, Xiaodong; Helseth, Lars Egil. 2015. Layer-by-layer polyelectrolyte films for contact electric energy harvesting. Journal of Physics D: Applied Physics. 48:075302: 1-10. doi: 10.1088/0022-3727/48/7/075302
  • Helseth, Lars Egil. 2015. Optisk overvåking av vann. Fra Fysikkens Verden. 77: 3-8.
  • Helseth, Lars Egil; Guo, Xiaodong. 2015. Contact electrification and energy harvesting using periodically contacted and squeezed water droplets. Langmuir. 31: 3269-3276. doi: 10.1021/la503494c
  • Helseth, Lars Egil. 2014. The descending helium balloon. Physics Education. 49: 380-382. doi: 10.1088/0031-9120/49/4/380
  • Helseth, Lars Egil. 2014. Excitation of energy harvesters using stick-slip motion. Smart materials and structures (Print). 23. doi: 10.1088/0964-1726/23/8/085024
  • Tengesdal, Øyvind Aasen; Hauge, Bjarte Lofnes; Helseth, Lars Egil. 2014. Electromagnetic and Optical Methods for Measurements of Salt Concentration of Water. Journal of Electromagnetic Analysis and Applications. 6: 130-139. doi: 10.4236/jemaa.2014.66013
  • Helseth, Lars Egil. 2013. Optical fibre spectrometer combined with a magnetic resonance sensor for multiple depth monitoring. Measurement science and technology. 24. 7 pages. doi: 10.1088/0957-0233/24/8/085605
  • Hauge, Bjørn; Helseth, Lars Egil. 2012. An electromagnetic resonance circuit for liquid level detection. European journal of physics. 33: 525-530. doi: 10.1088/0143-0807/33/3/525
  • Helseth, Lars Egil. 2012. Contactless hybrid sensor for simultaneous detection of light reflectance and eddy currents. Sensors and Actuators A-Physical. 173: 17-23. doi: 10.1016/j.sna.2011.10.002
  • Helseth, Lars Egil. 2012. Simultaneous measurements of absorption spectrum and refractive index in a microfluidic system. Optics Express. 20: 4653-4662. doi: 10.1364/OE.20.004653
  • Helseth, Lars Egil. 2012. Pyranine-induced self-assembly of colloidal structures using poly(allylamine-hydrochloride). Journal of Colloid and Interface Science. 375: 23-29. doi: 10.1016/j.jcis.2012.02.028
  • Helseth, Lars Egil. 2012. Fysikk og norsk oljeproduksjon. Fra Fysikkens Verden. 74: 77-80.
  • Helseth, Lars Egil. 2012. Comment on "Symmetry properties of three-dimensional magnetization distributions induced by focused circularly polarized lights". Optik (Stuttgart). 123: 657-657. doi: 10.1016/j.ijleo.2011.05.028
  • Miao, Yanhua; Liu, Yanhong; Hu, Lanying; Helseth, Lars Egil. 2012. Colloidal clustering of protein-coated microspheres in evaporating droplets. Soft Matter. 8: 2267-2273. doi: 10.1039/c2sm06777c
  • Helseth, Lars Egil. 2011. A simple experiment for visualizing diffusion. European journal of physics. 32: 1193-1197. doi: 10.1088/0143-0807/32/5/007
  • Helseth, Lars Egil. 2011. Light-induced magnetic vortices. Optics Letters. 36: 987-989.
  • Helseth, Lars Egil. 2010. A general method for focusing of waves using phase and amplitude compensation. Journal of Optics. 12. 4 pages. doi: 10.1088/2040-8978/12/3/035705
  • Helseth, Lars Egil. 2010. Under which conditions is quantum Brownian motion observable in a microscope? Physics Letters A. 374: 2801-2804. doi: 10.1016/j.physleta.2010.04.073
  • Helseth, Lars Egil. 2010. Focusing of evanescent vector waves. Optics Communications. 283: 29-33. doi: 10.1016/j.optcom.2009.09.053
  • Helseth, Lars Egil. 2009. Optical sensor for detecting colloidal phase transitions induced by magnetic fields. Journal of Physics D: Applied Physics. 42. doi: 10.1088/0022-3727/42/10/105005
  • Helseth, Lars Egil; Skodvin, Tore. 2009. Optical monitoring of low-field magnetophoretic separation of particles. Measurement science and technology. 20. 8 pages. doi: 10.1088/0957-0233/20/9/095202
  • Adrian, Michael; Helseth, Lars Egil. 2008. Magnetically tunable optical absorbance in a colloidal system. Physical Review E. Statistical, Nonlinear, and Soft Matter Physics. 77. 5 pages. doi: 10.1103/PhysRevE.77.021403
  • Helseth, Lars Egil. 2008. Elastic response of the resurrection fern Polypodium polypodioides during rehydration. Applied Physics Letters. 92. doi: 10.1063/1.2838357
  • Helseth, Lars Egil. 2008. Radiationless electromagnetic interference shaping of evanescent cylindrical vector waves. Physical Review A. Atomic, Molecular, and Optical Physics. 78. 4 pages. doi: 10.1103/PhysRevA.78.013819
  • Helseth, Lars Egil. 2008. Strongly focused electromagnetic waves in E x E* media. Optics Communications. 281: 5671-5673. doi: 10.1016/j.optcom.2008.09.003
  • Helseth, Lars Egil. 2008. The almost perfect lens and focusing of evanescent waves. Optics Communications. 281: 1981-1985. doi: 10.1016/j.optcom.2007.12.018
  • Helseth, Lars Egil; Johansen, Tom Henning; Fischer, Thomas M. 2008. Manipulation of paramagnetic particles using a nanoscale asymmetric magnetic potential. Applied Physics Letters. 93. 3 pages. doi: 10.1063/1.2967729
  • Helseth, Lars Egil; Kurniawan, Michael; Hansen, Runar Wattum; Johansen, Tom Henning. 2008. Large domain walls near crack lines in ferrimagnetic garnet films. Physical Review B. Condensed Matter and Materials Physics. 77. doi: 10.1103/PhysRevB.77.064433
  • Miao, YH; Helseth, Lars Egil. 2008. Adsorption of bovine serum albumin on polyelectrolyte-coated glass substrates: Applications to colloidal lithography. Colloids and Surfaces B: Biointerfaces. 66: 299-303. doi: 10.1016/j.colsurfb.2008.07.002
  • Helseth, Lars Egil; Backus, T.; Johansen, Tom Henning; Fischer, T. M. 2005. Colloidal crystallization and transport in stripes and mazes. Langmuir. 21: 7518-7523.
  • Helseth, Lars Egil; Johansen, Tom Henning; Fischer, T. M. 2005. Monolayer to bilayer transition in a dipolar system. Physical Review E. Statistical, Nonlinear, and Soft Matter Physics. 71. 8 pages.
  • Hansen, Runar Wattum; Helseth, Lars Egil; Solovyev, A; Il'Yashenko, E; Johansen, Tom Henning. 2004. Growth and characterization of (100) garnets for imaging. Journal of Magnetism and Magnetic Materials. 272-76: 2247-2249.
  • Hansteen, Fredrik; Helseth, Lars Egil; Johansen, Tom Henning; Hunderi, Ola; Kirilyuk, Andrei; Rasing, Theo. 2004. Optical and magnetooptical properties of bismuth and gallium stubstituted iron garnet films. Thin Solid Films. 455-56: 429-432.
  • Helseth, Lars Egil; Fischer, T. M.; Hansen, Runar Wattum; Johansen, Tom Henning. 2004. Microscopic magnetic squeezer. Applied Physics Letters. 85: 2556-2558.
  • Helseth, Lars Egil; Fischer, TM; Johansen, Tom Henning. 2004. Magnetic structuring and transport of colloids at interfaces. Journal of Magnetism and Magnetic Materials. 277: 245-250.
  • Helseth, Lars Egil; Fischer, T. M.; Johansen, Tom Henning. 2003. Paramagnetic Beads Surfing on Domain Walls. Physical Review E. Statistical, Nonlinear, and Soft Matter Physics. 67. 4 pages.
  • Helseth, Lars Egil; Fischer, T. M.; Johansen, Tom Henning. 2003. Domain Wall Tip for Manipulation of Magnetic Particles. Physical Review Letters. 91. 4 pages.
  • Helseth, Lars Egil; Wen, H. Z.; Fischer, T. M.; Johansen, Tom Henning. 2003. Adsorption and Diffusion in a 1D Potential Well. Physical Review E. Statistical, Nonlinear, and Soft Matter Physics. 68. 6 pages.
  • Helseth, Lars Egil. 2002. Model for imaging magnetic fields using a magnetooptic indicator. Journal of Magnetism and Magnetic Materials. 247: 230-236.
  • Helseth, Lars Egil. 2002. Interaction between superconducting films and magnetic nanostructures. Physical Review B. Condensed Matter and Materials Physics. 66: 104508.
  • Helseth, Lars Egil; Goa, Pål Erik; Hauglin, Harald; Baziljevich, Michael; Johansen, Tom Henning. 2002. Interaction between a Magnetic Domain Wall and a Superconductor. Virtual Journal of Applications of Superconductivity. 2.
  • Helseth, Lars Egil; Il'yashenko, Eugene; Baziljevich, Michael; Johansen, Tom Henning. 2002. Detection of magnetic data using a magnetooptic indicator. Journal of Applied Physics. 92. 6 pages.
  • Helseth, Lars Egil; Solovyev, A.G.; Hansen, Runar Wattum; Il'yashenko, Eugene; Baziljevich, Michael; Johansen, Tom Henning. 2002. Faraday rotation and sensitivity of (100) bismuth-substituted ferrite garnet films. Physical Review B. Condensed Matter and Materials Physics. 66: 064405.
  • Helseth, Lars Egil. 2001. Roles of polarization, phase and amplitude in solid immersion lens systems. Optics Communications. 191: 161-172.
  • Helseth, Lars Egil; Hansen, Runar Wattum; Baziljevich, Michael; Johansen, Tom Henning. 2001. Faraday rotation spectra of bismuth-substituted ferrite garnet films with in-plane magnetization. Physical Review B. Condensed Matter and Materials Physics. 64,174406.
  • Helseth, Lars Egil; Singstad, Ingar. 2001. Diffusers for holographic Stereography. Optics Communications. 193. 6 pages.

More information in national current research information system (CRIStin)

Academic education and positions:

2008 - : Professor, Department of Physics and Technology, University of Bergen, Norway.

2005 - 2008: Assistant Professor, Divison of Physics and Applied Physics, Nanyang Technological University, Singapore.

2003 - 2005: Postdoc/scientist at the Department of Chemistry and Biochemistry, Florida State University, Tallahassee (USA), 2003-2005.

2002 - 2003: Postdoc/scientist at Max Planck Institute of Colloids and Interfaces, Golm/Potsdam (Germany), 2002 - 2003

2000 - 2002: PhD-studies at the University of Oslo, Norway, obtained a Dr. Scient. degree (physics) in optics/magnetism.

1994 - 1999: Undergraduate studies at the University of Bergen, Norway, obtained a Master of Science (Cand. Sci.) degree in experimental physics.

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