Lars Egil Helseth
professor
Elektronikk og målevitenskap
Institutt for fysikk og teknologi
1) Electromagnetiske felter.
2) Optiske sensorer og avbildningssystemer.
3) Statistisk fysikk og mikrostrukturer.
4) Fornybare energikilder.
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 degree in optics and magnetism.
1994 - 1999: Undergraduate studies at the University of Bergen, Norway, obtained a Master of Science (Cand. Sci.) degree in experimental physics.
Selected publications in peer reviewed journals:
1) "Optical fiber spectrometer combined with a magnetic resonance sensor for multiple depth monitoring", L.E. Helseth, Measurement Science and Technology, Vol. 24, 085605 (2013).
2) "Pyranine-induced self-assembly of colloidal structures
using poly(allylamine-hydrochloride)", L.E. Helseth, Journal of Colloid and Interface Science, Vol. 375, 23 (2012).
3) “Electromagnetic resonance circuit for liquid level detection”, B.L. Hauge, L.E. Helseth, Eur. J. Phys, Vol. 33, 525 (2012).
4) “Simultaneous measurements of absorption spectrum and refractive index in a microfluidic system”, L.E. Helseth, Optics Express, Vol. 20, Iss. 4, pp. 4653–4662 (2012)
5) “Colloidal clustering of protein-coated microspheres in evaporating droplets”, Y.H. Miao, Y. Liu, L. Hu and L.E. Helseth, Soft Matter, Vol. 8, 2267 (2012).
6) “Contactless hybrid sensor for simultaneous detection of light reflectance and eddy currents”, L.E. Helseth, Sensors and Actuators A, Vol. 173, 17 (2012).
7) "Light-induced magnetic vortices", Optics Letters, Vol. 36, 987 (2011).
8) "Under which conditions is quantum Brownian motion observable
in a microscope?" Physics Letters A, Vol. 374, 2801 (2010).
9) "A general method for focusing of waves using phase and amplitude compensation", L.E. Helseth, J. Opt., Vol. 12, 035705 (2010).
10) "Focusing of evanescent waves", L.E. Helseth, Opt. Commun., Vol. 283, 29 (2010).
11) "Optical monitoring of low-field magnetophoretic
separation of particles", L.E. Helseth and T. Skodvin, Meas. Science Tech., Vol. 20, 095202 (2009).
12) "Optical sensor for detecting colloidal phase transitions induced
by magnetic fields", L.E. Helseth, J. Phys. D, 42, 105005 (2009).
13) "Strongly focused electromagnetic waves in ExE* media", L.E. Helseth, Opt. Commun., 281, 5671 (2008).
14) "Adsorption of bovine serum albumin on polyelectrolyte-coated glass substrates: Applications to colloidal lithography", Y. Miao and L.E. Helseth, Coll. Surf. B, 66, 299 (2008).
15) 'Radiationless electromagnetic interference shaping of evanescent cylindrical vector waves', L. E. Helseth, Phys. Rev. A 78, 013819 (2008).
16) 'Almost perfect lens and focusing of evanescent waves', Opt. Commun., L.E. Helseth, 281, 1981 (2008).
17) 'Manipulation of paramagnetic particles using a nanoscale asymmetric magnetic potential', L. E. Helseth, T. H. Johansen, and T. M. Fischer, Appl. Phys. Lett. 93, 042516 (2008). See also August 18, 2008 issue of Virtual Journal of Nanoscale Science & Technology.
18) 'Large domain walls near crack lines in ferrimagnetic garnet films', L.E. Helseth, M. Kurniawan, R.W. Hansen and T.H. Johansen, Phys. Rev. B, 77, 064433 (2008).
19) ‘Elastic response of the resurrection fern Polypodium Polypodioides during rehydration', L.E. Helseth, Appl. Phys. Lett., 92, 043902 (2008).
20) 'Paramagnetic colloids as sensitive force detectors in liquids', L.E. Helseth, Journal of Physics D: Appl. Phys., Vol. 40, 3030 (2007).
21) 'Spectral density of polychromatic electromagnetic waves', L.E. Helseth, Phys. Rev. E, Vol. 73, 026602 (2006).
22) 'Particle diffusion in a field-guided microfluidic channel', L.E. Helseth, H.Z. Wen and T.M. Fischer, Journal of Applied Physics, Vol.99, 024909 (2006).
23) 'Self-assembly of colloidal pyramids in magnetic fields', L.E. Helseth, Langmuir, Vol. 21, 7276 (2005).
24) 'Colloidal crystallization and transport in stripes and mazes', L.E. Helseth, T. Backus, T.H. Johansen and T.M. Fischer, Langmuir, Vol. 21, 7518 (2005).
25) Physical mechanisms of rehydration in Polypodium Polypodioides, a resurrection plant', L.E. Helseth and T.M. Fischer, Phys. Rev. E, Vol. 71, 061903 (2005). Also selected for Virtual Journal of Biological Physics Research, Vol.9 Issue 12, June 15 (2005).
26) ‘Assembling and manipulating a two-dimensional colloidal crystals with movable nanomagnets', L.E. Helseth, H.Z. Wen, R.W. Hansen, T.H. Johansen and T.M. Fischer, Langmuir, Vol. 20, 7323 (2004).
27) ‘Cooperative microlenses', L.E. Helseth and T.M. Fischer, Opt. Express, Vol. 12, 3428 (2004).
28) ‘Optical vortices in focal regions', L.E. Helseth, Opt. Commun. 229, pp. 85-91 (2004).
29) ‘Domain wall tip for manipulation of magnetic particles', L.E. Helseth, T.M. Fischer and T.H. Johansen, Phys. Rev. Lett., Vol.91, Number 20, 208302 (2003). See also Virtual Journal of Nanoscale Science and Technology, Vol.8 Issue 21, November 24 (2003).
30) 'Focusing of atoms with strongly confined light potentials', L.E. Helseth, Opt. Commun., 212 (4-6), 343 (2002).
31) 'Faraday rotation and sensitivity of (100) bismuth-substituted ferrite garnet films ', L.E. Helseth, A.G. Solovyev, E.I. Il'yashenko, R.W. Hansen, M. Baziljevich and T.H. Johansen, Phys. Rev. B, 66, 064405 (2002).
32) 'Roles of polarization, phase and amplitude in solid immersion lens systems', L.E. Helseth, Opt. Commun., 191, 161 (2001).