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Professor

Olav Gaute Hellesø

Professor / Ultrasound, Microwaves and Optics
Department of Physics and Technology




Research interests

The research is focused on optical waveguides for trapping and sensing.

Waveguides can be used to trap, propel and detect nano- and microparticles. We have demonstrated that the waveguides can be used to squeeze red blood cells, which can be used to measure their elasticity. The elasticity of red blood cells is very important for their functions in the body and the measured elasticity was related to how long the cells had been stored. Regarding trapping of microparticles, a small gap (2um) in a waveguide loop can tightly trap a microparticle, while a wider gap (10um) can be used to levitate a particle above the surface of the chip. When a microparticle is trapped on a waveguide Mach-Zehnder interferometer, it induces a measureable phase change, which can be related to the size of the trapped particle.

Waveguides can be used to make highly sensitive interferometers. In order to detect methane, we cover the waveguide (sensing arm) by a polymer (SAN) doped with a cage-shaped molecule (cryptophane-A). Methane diffuses into the polymer and is trapped in the cage-molecule. This gives a change in the refractive index of the polymer, which gives a phase-change for the evanescent field of the guided mode. This is detected by the interferometer and can be related to the concentration of methane. We have used this method to measure the methane concentration down to 6 ppm.

Teaching

Teaching FYS-1003 Experimental physics, FYS-2008 Measurement techniques and FYS-3009 Photonics

Publications in CRIStin


  • Hellesø, Olav Gaute. Optical pressure and numerical simulation of optical forces. Applied Optics 2017; Volum 56 (12). ISSN 1559-128X.s 3354 - 3358.s doi: 10.1364/AO.56.003354.

  • Dullo, Firehun Tsige; Ingvaldsen, Martin; Jágerská, Jana; Jacobsen, Svein Ketil; Hellesø, Olav Gaute. Temperature Sensitivity of a Waveguide Young Interferometer. IEEE Photonics Technology Letters 2016; Volum 28 (11). ISSN 1041-1135.s 1205 - 1208.s doi: 10.1109/LPT.2016.2523064.

  • Ahluwalia, Balpreet Singh; Helle, Øystein Ivar; Hellesø, Olav Gaute. Rib waveguides for trapping and transport of particles. Optics Express 2016; Volum 24 (5). ISSN 1094-4087.s 4477 - 4487.s doi: 10.1364/OE.24.004477.

  • Dullo, Firehun Tsige; Tinguely, Jean-Claude; Solbø, Stian; Hellesø, Olav Gaute. Single-mode limit and bending losses for shallow Rib Si3N4 waveguides. IEEE Photonics Journal 2015; Volum 7 (1). ISSN 1943-0655.s doi: 10.1109/JPHOT.2014.2387252.

  • Ahluwalia, Balpreet Singh; McCourt, Peter Anthony; Oteiza, Ana; Wilkinson, James S.; Huser, Thomas Rolf; Hellesø, Olav Gaute. Squeezing red blood cells on an optical waveguide to monitor cell deformability during blood storage. The Analyst 2015; Volum 140 (1). ISSN 0003-2654.s 223 - 229.s doi: 10.1039/c4an01181c.

  • Helle, Øystein Ivar; Ahluwalia, Balpreet Singh; Hellesø, Olav Gaute. Optical transport, lifting and trapping of micro-particles by planar waveguides. Optics Express 2015; Volum 23 (15). ISSN 1094-4087.s 6601 - 6612.s doi: 10.1364/OE.23.006601.

  • Lindecrantz, Susan Mariah; Tinguely, Jean-Claude; Ahluwalia, Balpreet Singh; Hellesø, Olav Gaute. Characterization of a waveguide Mach-Zehnder interferometer using PDMS as a cover layer. Journal of the European Optical Society - Rapid Publications 2015; Volum 10 (15020). ISSN 1990-2573.s 1 - 7.s doi: 10.2971/jeos.2015.15020.

  • Dullo, Firehun Tsige; Hellesø, Olav Gaute. On-chip phase measurement for microparticles trapped on a waveguide. Lab on a Chip 2015; Volum 15 (19). ISSN 1473-0197.s 3918 - 3924.s doi: 10.1039/c5lc00794a.

  • Dullo, Firehun Tsige; Lindecrantz, Susan; Jagerska, Jana; Hansen, Jørn H; Engqvist, Stig Olov Magnus; Solbø, Stian; Hellesø, Olav Gaute. Sensitive on-chip methane detection with a cryptophane-A cladded Mach-Zehnder interferometer. (data) Optics Express 2015; Volum 23. ISSN 1094-4087.s 331564 - 31573.s doi: 10.1364/OE.23.031564.

  • Lindecrantz, Susan; Hellesø, Olav Gaute. Estimation of propagation losses for narrow strip and rib waveguides. IEEE Photonics Technology Letters 2014; Volum 26 (18). ISSN 1041-1135.s 1836 - 1839.s doi: 10.1109/LPT.2014.2337055.

  • Tinguely, Jean-Claude; Ding, Ming; Brambilla, Gilberto; Hohenau, A; Krenn, J. R.; Hellesø, Olav Gaute. Nanostructured fibre tip for trapping of nanoparticles. Proceedings of SPIE, the International Society for Optical Engineering 2014; Volum 8999. ISSN 0277-786X.s doi: 10.1117/12.2037240.

  • Dullo, Firehun Tsige; Sokolov, Viktor; Cyprien, Chauvet; Lindecrantz, Susan; Solbø, Stian; Hellesø, Olav Gaute. Temperature sensitivity of waveguide Mach-Zehnder interferometer. Proceedings of SPIE, the International Society for Optical Engineering 2014; Volum 8988:T. ISSN 0277-786X.s doi: 10.1117/12.2039556.

  • Ahluwalia, Balpreet Singh; McCourt, Peter Anthony; Wilkinson, James S.; Huser, Thomas; Hellesø, Olav Gaute. Optical deformation of red blood cells trapped on a narrow waveguide. SPIE - International Society for Optical Engineering 2014 ISBN 9781628411911.s doi: 10.1117/12.2062590.

  • Ahluwalia, Balpreet Singh; Brox, Petter; Helle, Øystein Ivar; Tinguely, Jean-Claude; Hellesø, Olav Gaute. Near-field waveguide trapping and tracking of particles using fluorescence imaging. SPIE - International Society for Optical Engineering 2014 ISBN 9780819499127.s doi: 10.1117/12.2039235.

  • Lindecrantz, Susan; Dullo, Firehun Tsige; Ahluwalia, Balpreet Singh; Hellesø, Olav Gaute. Sensitivity of Mach-Zehnder interferometer for dissolved gas monitoring. SPIE - International Society for Optical Engineering 2014 ISBN 9780819499011.s doi: 10.1117/12.2039431.

  • Ahluwalia, Balpreet Singh; McCourt, Peter Anthony; Oteiza, Ana; Wilkinson, James S.; Huser, Thomas Rolf; Hellesø, Olav Gaute. Squeezing red blood cells with the evanescent field of an optical waveguide to monitor cell deformability during blood storage. The Analyst 2014; Volum 140. ISSN 0003-2654.s 223 - 229.s doi: 10.1039/C4AN01181C.

  • Løvhaugen, Pål; Ahluwalia, Balpreet Singh; Huser, Thomas Rolf; Hellesø, Olav Gaute. Serial Raman spectroscopy of particles trapped on a waveguide. Optics Express 2013; Volum 21 (3). ISSN 1094-4087.s 2964 - 2970.s doi: 10.1364/OE.21.002964.

  • Ahluwalia, Balpreet Singh; Hellesø, Olav Gaute. Optical waveguide loop for planar trapping of blood cells and microspheres. Proceedings of SPIE, the International Society for Optical Engineering 2013; Volum 8810 (12). ISSN 0277-786X.s doi: 10.1117/12.2023945.

  • Hellesø, Olav Gaute; Løvhaugen, Pål; Subramanian, Ananth Z.; Wilkinson, James S.; Ahluwalia, Balpreet Singh. Surface transport and stable trapping of particles and cells by an optical waveguide loop. Lab on a Chip 2012; Volum 12 (18). ISSN 1473-0197.s 3436 - 3440.s doi: 10.1039/c2lc40375g.

  • Ahluwalia, Balpreet Singh; Løvhaugen, Pål; Hellesø, Olav Gaute. Waveguide trapping of hollow glass spheres. Optics Letters 2011; Volum 36 (17). ISSN 0146-9592.s 3347 - 3349.s doi: 10.1364/OL.36.003347.

  • Løvhaugen, Pål; Ahluwalia, Balpreet Singh; Huser, Thomas Rolf; Mccourt, Peter Anthony; Hellesø, Olav Gaute. Optical trapping forces on biological cells on a waveguide surface. Proceedings of SPIE, the International Society for Optical Engineering 2011; Volum 7902. ISSN 0277-786X.s doi: 10.1117/12.873779.

  • Løvhaugen, Pål; Ahluwalia, Balpreet Singh; Hellesø, Olav Gaute. Optical waveguide trapping forces on hollow glass spheres. Proceedings of SPIE, the International Society for Optical Engineering 2011; Volum 7950. ISSN 0277-786X.s doi: 10.1117/12.873772.

  • Ahluwalia, Balpreet Singh; Mccourt, Peter Anthony; Huser, Thomas Rolf; Hellesø, Olav Gaute. Optical trapping and propulsion of red blood cells on waveguide surfaces. Optics Express 2010; Volum 18 (20). ISSN 1094-4087.s 21053 - 21061.

  • Ahluwalia, Balpreet Singh; Hellesø, Olav Gaute; Subramanian, Ananth Z.; Wilkinson, James S.; Chen, Jie; Chen, Xuyuan. Integrated platform based on high refractive index contrast waveguide for optical guiding and sorting. (data) (omtale) (sammendrag) Proceedings of SPIE, the International Society for Optical Engineering 2010 (7613). ISSN 0277-786X.s 1 - 8.s doi: 10.1117/12.840632.

  • Ahluwalia, Balpreet Singh; Hellesø, Olav Gaute; Subramanian, Ananth Z.; Perney, N. M. B.; Sessions, N. P.; Wilkinson, James S.. Fabrication and optimization of Tantalum pentoxide waveguides for optical micro-propulsion. (data) SPIE - International Society for Optical Engineering 2010 ISBN 9780819480002.

  • Ahluwalia, Balpreet Singh; Subramanian, A. Z.; Hellesø, Olav Gaute; Perney, N. M. B.; Sessions, N. P.; Wilkinson, J. S.. Fabrication of Submicrometer High Refractive Index Tantalum Pentoxide Waveguides for Optical Propulsion of Microparticles. IEEE Photonics Technology Letters 2009; Volum 21 (19). ISSN 1041-1135.s 1408 - 1410.s doi: 10.1109/LPT.2009.2027025.

  • Néel, D.; Gétin, S.; Ferret, P.; Rosina, M.; Fedeli, J. M.; Hellesø, Olav Gaute. Optical transport of semiconductor nanowires on silicon nitride waveguides. Applied Physics Letters 2009; Volum 94 (25). ISSN 0003-6951.s doi: 10.1063/1.3148778.

  • Grujic, Katarina; Hellesø, Olav Gaute. Dielectric microsphere manipulation and chain assembly by counter-propagating waves in a channel waveguide. Optics Express 2007; Volum 15 (10). ISSN 1094-4087.s 6470 - 6477.

  • Grujic, Katarina; Hole, John Patrick; Hellesø, Olav Gaute; Wilkinson, James S.. Whispering gallery mode excitation in borosilicate glass microspheres by K+ ion-exchanged channel waveguide coupler. SPIE - International Society for Optical Engineering 2006 (6101) ISBN 9780819461438. ISSN 0277-786X.

  • Hellesø, Olav Gaute; Grujic, Katarina; Hole, John Patrick; Jaising, Hitesh Y; Wilkinson, James S.. Manipulation of microparticles with integrated optics. SPIE - International Society for Optical Engineering 2006 (6123) ISBN 9780819461650. ISSN 0277-786X.

  • Jaising, Hitesh Y; Grujic, Katarina; Hellesø, Olav Gaute. Simulations and velocity measurements for a microparticle in an evanescent field. Optical Review 2005; Volum 12. ISSN 1340-6000.

  • Grujic, Katarina; Hellesø, Olav Gaute; Hole, JP; Wilkinson, JS. Sorting of polystyrene microspheres using a Y-branched optical waveguide. Optics Express 2005; Volum 13 (1). ISSN 1094-4087.s 1 - 7.

  • Jaising, Hitesh Y; Hellesø, Olav Gaute. Radiation forces on a Mie particle in the evanescent field of an optical waveguide. Optics Communications 2005; Volum 246. ISSN 0030-4018.

  • Hole, JP; Wilkinson, JS; Grujic, Katarina; Hellesø, Olav Gaute. Velocity distribution of Gold nanoparticles trapped on an optical waveguide. Optics Express 2005; Volum 13. ISSN 1094-4087.s 3896 - 3901.

  • Grujic, Katarina; Hellesø, Olav Gaute; Wilkinson, JS; Hole, JP. Optical propulsion of microspheres along a channel waveguide produced by Cs+ ion-exchange in glass. Optics Communications 2004; Volum 239. ISSN 0030-4018.s 227 - 235.

  • Chen, Xuyuan; Pedersen, A.; Hellesø, Olav Gaute; Van Rheenen, Arthur D.. Electrical noise of laser diodes measured over a wide range of bias-currents. Microelectronics and reliability 2000; Volum 40. ISSN 0026-2714.s 1925 - 1928.

  • Hellesø, Olav Gaute. Michelson interferometer and reference mirrors integrated on glass. Measurement science and technology 1995 (6). ISSN 0957-0233.s 1362 - 1367.

  • Hellesø, Olav Gaute. Interferometric displacement sensor made by integrated optics on glass. Sensors and Actuators A-Physical 1995; Volum 47 (1-3). ISSN 0924-4247.s 478 - 481.

  • Hellesø, Olav Gaute. Propagation losses in poassium ion-exchanged waveguide with superstrate. Applied Optics 1995; Volum 34 (33). ISSN 0003-6935.s 7702 - 7704.

  • Hellesø, Olav Gaute. Low loss S-bends in K+ ion-exchanged waveguides. IEEE Photonics Technology Letters 1994; Volum 6 (10). ISSN 1041-1135.s 1241 - 1243.

  • Hellesø, Olav Gaute. Displacement sensor made by potassium diffusion on glass. Journal of Lightwave Technology 1994; Volum 12 (3). ISSN 0733-8724.s 568 - 572.

  • Hellesø, Olav Gaute. Single-mode potassium and silver ion-exchanged glass waveguides with low losses and high index increase. Applied Physics Letters 1992; Volum 61 (23). ISSN 0003-6951.s 2759 - 2760.

  • Hellesø, Olav Gaute. Diode laser butt coupling to K+ diffused waveguides in glass. IEEE Photonics Technology Letters 1992; Volum 4 (8). ISSN 1041-1135.s 900 - 902.

  • Løvhaugen, Pål; Ahluwalia, Balpreet Singh; Huser, Thomas Rolf; McCourt, Peter Anthony; Hellesø, Olav Gaute. Optical trapping forces on biological cells on a waveguide surface. (sammendrag) SPIE - International Society for Optical Engineering 2011 ISBN 9780819484390.

  • Yadav, Mukesh; Jágerská, Jana; Hansen, Jørn H; Hellesø, Olav Gaute. Sensitivity and response time of an on-chip methane sensor. The European Conference on Lasers and Electro-Optics (CLEO Europe) 2017-06-25 - 2017-06-29 2017.

  • Jágerská, Jana; Dullo, Firehun Tsige; Lindecrantz, Susan M.; Boergers, Jacqueline; Hansen, Jørn H; Lechuga, Laura Gomez; Hellesø, Olav Gaute. Cryptophane-Cladded Interferometric Waveguide Sensor for Aqueous Methane Detection. CLEO: Applications and Technology 2017-05-14 - 2017-05-19 2017.

  • Jágerská, Jana; Dullo, Firehun Tsige; Ingvaldsen, Martin; Lindecrantz, Susan M.; Hansen, Jørn H; Solbø, Stian; Hellesø, Olav Gaute. On-chip methane sensing with a cryptophane-A cladded Mach-Zehnder interferometer. Field Laser Applications in Industry and Research 2016 2016-09-12 - 2016-09-16 2016.

  • Jágerská, Jana; Dullo, Firehun Tsige; Ingvaldsen, Martin; Lindecrantz, Susan M.; Engqvist, Magnus; Hansen, Jørn H; Solbø, Stian; Hellesø, Olav Gaute. On-chip methane sensors based on cryptophane-A cladded waveguide interferometers. Norwegian electro-optics meeting 2016 2016-04-13 - 2016-04-15 2016.

  • Ingvaldsen, Martin; Jágerská, Jana; Dullo, Firehun Tsige; Lindecrantz, Susan M.; Engqvist, Magnus; Hansen, Jørn H; Solbø, Stian; Hellesø, Olav Gaute. Cryptophane-A doped polymers for methane sensing. Norwegian electro-optics meeting 2016 2016-04-13 - 2016-04-15 2016.

  • Jágerská, Jana; Dullo, Firehun Tsige; Ingvaldsen, Martin; Lindecrantz, Susan M.; Engqvist, Magnus; Hansen, Jørn H; Hellesø, Olav Gaute. On-Chip Methane Sensing with Cryptophane-A Cladded Waveguide Interferometers. CLEO: Science and Innovations 2016-06-05 - 2016-06-10 2016.

  • Dullo, Firehun Tsige; Lindecrantz, Susan; Hellesø, Olav Gaute; Solbø, Stian. Optical Waveguide Interferometer for Measuring Methane Concentration. Optoelectronics Technologies for oil and gas industry 2013-06-06 - 2013.

  • Lindecrantz, Susan; Hellesø, Olav Gaute. Analysis of Homogeneous Sensitivity of Rib-waveguides of Mach-Zehnder Interferometer. Proceedings of the 16th European Conference on Integrated Optics (ECIO) & The 20th International Workshop on Optical Waveguide Theory and Numerical l Modelling 2012-04-18 - 2012-04-21 2012.

  • Lindecrantz, Susan; Hellesø, Olav Gaute. Design of waveguide Mach-Zehnder Interferometer sensor for subsea detection of methane. Optoelectronic Technologies for the Oil and Gas Industry 2011-11-27 - 2011-11-27 2011.

  • Hellesø, Olav Gaute. MicroMove: Flytting, karakterisering og sorteringav mikro- og nanopartiklar med lys. Fredagsforedrag ved IFT, Univ. i Bergen 2009-05-08 - 2009.

  • Husabø, Bjarne J.; Ahluwalia, Balpreet Singh; Hellesø, Olav Gaute. Q-factor of high refractive index glass microspheres in air and water. Northern Optics 2009 2009-08-26 - 2009-08-28 2009.

  • Hellesø, Olav Gaute. MicroMove: Moving, characterising and sorting micro- and nanoparticles with light. Gjesteforelesing ved IET, NTNU 2009-11-19 - 2009.

  • Grujic, Katarina; Hellesø, Olav Gaute. Assembly of microsphere chains by counterpropagating, guided waves. European Conference on Integrated Optics 2007-04-25 - 2007-04-27 2007.

  • Hellesø, Olav Gaute. Urbane Tromsø søkjer sosiale sivilingeniørar. Nordlys 2007. ISSN 0805-5440.

  • Wilkinson, James S.; Hole, John Patrick; Grujic, Katarina; Hellesø, Olav Gaute. Propulsion and Sorting of Gold Nanospheres on Optical Waveguides. International Conference on Optics-photonics Design & Fabrication 2006-12-06 - 2006-12-08 2006.

  • Grujic, Katarina; Hole, John Patrick; Hellesø, Olav Gaute; Wilkinson, James S.. Morphology dependent resonances for a microparticle optically trapped on the surface of a waveguide. Northern Optics 2006-06-14 - 2006-06-16 2006.

  • Wilkinson, James S.; Hellesø, Olav Gaute; Hole, John Patrick; Grujic, Katarina. Optical Waveguide Manipulation of Micro- and Nanospheres. Progress in Electromagnetics Research Symposium 2006-03-26 - 2006-03-29 2006.

  • Grujic, Katarina; Hole, John Patrick; Hellesø, Olav Gaute; Wilkinson, James S.. Whispering gallery modes excitation in borosilicate glass microspheres by K+ ion-exchanged channel waveguide coupler. Photonics West 2006-01-21 - 2006-01-26 2006.

  • Hellesø, Olav Gaute; Grujic, Katarina; Hole, John Patrick; Jaising, Hitesh Y; Wilkinson, James S.. Manipulation of microparticles with integrated optics. Photonics West 2006-01-21 - 2006-01-26 2006.

  • Blad, Jakob; Hadzialic, Sanja; Solgaard, Olav; Sudbø, Aasmund Sveinung; Grujic, Katarina; Wilkinson, JS; Hellesø, Olav Gaute; Hole, JP. Nanostrukturar for optikk. Nanoteknologi - nye muligheter for norsk industri 2006-06-08 - 2006-06-08 2006.

  • Grujic, Katarina; Hellesø, Olav Gaute. Microsphere chain formation in the evanescent field of an optical waveguide. European Conference on Integrated Optics (ECIO) 2005-04-06 - 2005-04-08 2005.

  • Hellesø, Olav Gaute; Hanssen, Alfred; Fredriksen, Åshild. NSB-tog i Tromsø. Fra Fysikkens Verden 2005 (3). ISSN 0015-9247.s 71 - 73.

  • Grujic, Katarina; Hellesø, Olav Gaute. Guiding and Sorting of Micro- and Nano-Particles with Integrated Optics. CLEO/Europe 2005-06-12 - 2005-06-17 2005.

  • Hellesø, Olav Gaute; Grujic, Katarina. Manipulation of microspheres in the evanescent field of an optical waveguide. Fysikermøtet 2005-08-11 - 2005-08-14 2005.

  • Jaising, Hitesh Y; Grujic, Katarina; Hellesø, Olav Gaute. Simulations and velocity measurements for a microparticle in an evanescent field. 2004 ICO International Conference on Optics & Photonics in Technology Frontier 2004-07-12 - 2004-07-15 2004.

  • Grujic, Katarina; Hellesø, Olav Gaute. Guiding of polystyrene and glass microspheres along Cs+ ion-exchanged waveguides. The Norwegian Electro-optics meeting 2004 2004-05-02 - 2004-05-04 2004.

  • Hellesø, Olav Gaute. Bruk av lys til å manipulera, detektera og sortera mikro- og nanopartiklar. Internt seminar, Mat.nat.-fak, UiTø 2003-11-21 - 2003.

  • Jaising, Hitesh Y; Grujic, Katarina; Hellesø, Olav Gaute. Integrated Optics Structures for Trapping and Manipulation of Small Particles. Norwegian Electooptics Meeting 2002-01-01 - 2002-01-01 2001.

  • Grujic, Katarina; Jaising, Hitesh Y; Hellesø, Olav Gaute. Optimising Waveguide Structure for the Purpose of Particle Trapping. Norwegian Electro-Optics Meeting 2002-01-01 - 2002-01-01 2001.

  • Chen, Xuyuan; Pedersen, A.; Hellesø, Olav Gaute; Van Rheenen, Arthur D.. Electrical noise of laser diodes measured over a wide range of bias-currents. 15th Inter. Conf. on Noise in Phys. Systems and 1/¦ Fluctuations 1999-01-01 - 1999-01-01 1999.

  • Hellesø, Olav Gaute. Interferometric displacement sensor integrated on glass. Optical Fiber Sensors - 9 1993-05-04 - 1993-05-06 1993.

  • Member of research group