Photo: Bjørn-Kåre Iversen
Olav Gaute Hellesø
Job description
Head of Department of Physics and Technology, member of the research group for Ultrasound, Microwaves and Optics, and professor in optics
Mathias Novik Jensen,
Eduarda Mazagao Guerreiro,
Agustin Enciso-Martinez,
Sergei G. Kruglik,
Cees Otto,
Omri Snir
et al.:
Identification of extracellular vesicles from their Raman spectra via self-supervised learning
Eduarda Mazagao Guerreiro,
Sergei G. Kruglik,
Samantha Swamy,
Nadezhda Latysheva,
Bjarne Østerud,
Jean-Michel Guigner
et al.:
Extracellular vesicles from activated platelets possess a phospholipid-rich biomolecular profile and enhance prothrombinase activity
Aaron Schäpers,
Olav Gaute Hellesø,
Jochen Fick
:
Optical trapping in air on a single interference fringe
Md Rabiul Hasan,
Olav Gaute Hellesø
:
Metasurface supporting quasi-BIC for optical trapping and Raman-spectroscopy of biological nanoparticles
Mathias Novik Jensen,
James C. Gates,
Alex I. Flint,
Olav Gaute Hellesø
:
Demonstrating low Raman background in UV-written SiO2 waveguides
Md Rabiul Hasan,
Olav Gaute Hellesø
:
Materials for Dielectric Nanotweezers in the Near-Visible Region
ACS applied optical materials 2023 DOI
Mathias Novik Jensen,
Olav Gaute Hellesø
:
Evaluation of crystalline structure quality of Czochralski-silicon using near-infrared tomography
Rabiul Hasan,
Olav Gaute Hellesø
:
Dielectric optical nanoantennas
Mathias Novik Jensen,
Olav Gaute Hellesø
:
Measuring the end-face of silicon boules using mid-infrared laser scanning
CrysteEngComm 09. June 2021 DOI
Mathias Novik Jensen,
Olav Gaute Hellesø
:
Measuring the end-face of silicon boules using mid-infrared laser scanning
CrysteEngComm 2021 DOI
Øystein Ivar Helle,
Firehun Tsige Dullo,
Marcel Lahrberg,
Jean-Claude Tinguely,
Olav Gaute Hellesø,
Balpreet Singh Ahluwalia
:
Structured illumination microscopy using a photonic chip
Olav Gaute Hellesø
:
Optical pressure and numerical simulation of optical forces
Applied Optics 2017 DOI
Balpreet Singh Ahluwalia,
Øystein Ivar Helle,
Olav Gaute Hellesø
:
Rib waveguides for trapping and transport of particles
Firehun Tsige Dullo,
Martin Ingvaldsen,
Jana Jágerská,
Svein Ketil Jacobsen,
Olav Gaute Hellesø
:
Temperature Sensitivity of a Waveguide Young Interferometer
IEEE Photonics Technology Letters 2016 DOI
Firehun Tsige Dullo,
Susan Lindecrantz,
Jana Jagerska,
Jørn H Hansen,
Stig Olov Magnus Engqvist,
Stian Solbø
et al.:
Sensitive on-chip methane detection with a cryptophane-A cladded Mach-Zehnder interferometer
Firehun Tsige Dullo,
Olav Gaute Hellesø
:
On-chip phase measurement for microparticles trapped on a waveguide
Lab on a Chip 2015 DOI
Susan Mariah Lindecrantz,
Jean-Claude Tinguely,
Balpreet Singh Ahluwalia,
Olav Gaute Hellesø
:
Characterization of a waveguide Mach-Zehnder interferometer using PDMS as a cover layer
Øystein Ivar Helle,
Balpreet Singh Ahluwalia,
Olav Gaute Hellesø
:
Optical transport, lifting and trapping of micro-particles by planar waveguides
Balpreet Singh Ahluwalia,
Peter Anthony McCourt,
Ana Oteiza,
James S. Wilkinson,
Thomas Rolf Huser,
Olav Gaute Hellesø
:
Squeezing red blood cells on an optical waveguide to monitor cell deformability during blood storage
The Analyst 2015 DOI
Firehun Tsige Dullo,
Jean-Claude Tinguely,
Stian Solbø,
Olav Gaute Hellesø
:
Single-mode limit and bending losses for shallow Rib Si3N4 waveguides
Balpreet Singh Ahluwalia,
Peter Anthony McCourt,
Ana Oteiza,
James S. Wilkinson,
Thomas Rolf Huser,
Olav Gaute Hellesø
:
Squeezing red blood cells with the evanescent field of an optical waveguide to monitor cell deformability during blood storage
The Analyst 2014 DOI
Susan Lindecrantz,
Olav Gaute Hellesø
:
Estimation of propagation losses for narrow strip and rib waveguides
IEEE Photonics Technology Letters 2014 DOI
Balpreet Singh Ahluwalia,
Petter Brox,
Øystein Ivar Helle,
Jean-Claude Tinguely,
Olav Gaute Hellesø
:
Near-field waveguide trapping and tracking of particles using fluorescence imaging
SPIE - The International Society for Optics and Photonics 2014 DOI
Susan Lindecrantz,
Firehun Tsige Dullo,
Balpreet Singh Ahluwalia,
Olav Gaute Hellesø
:
Sensitivity of Mach-Zehnder interferometer for dissolved gas monitoring
SPIE - The International Society for Optics and Photonics 2014 DOI
Balpreet Singh Ahluwalia,
Peter Anthony McCourt,
James S. Wilkinson,
Thomas Huser,
Olav Gaute Hellesø
:
Optical deformation of red blood cells trapped on a narrow waveguide
SPIE - The International Society for Optics and Photonics 2014 DOI
Jean-Claude Tinguely,
Ming Ding,
Gilberto Brambilla,
A Hohenau,
J. R. Krenn,
Olav Gaute Hellesø
:
Nanostructured fibre tip for trapping of nanoparticles
Proceedings of SPIE, the International Society for Optical Engineering 25. February 2014 DOI
Firehun Tsige Dullo,
Viktor Sokolov,
Chauvet Cyprien,
Susan Lindecrantz,
Stian Solbø,
Olav Gaute Hellesø
:
Temperature sensitivity of waveguide Mach-Zehnder interferometer
Proceedings of SPIE, the International Society for Optical Engineering 08. March 2014 DOI
Balpreet Singh Ahluwalia,
Olav Gaute Hellesø
:
Optical waveguide loop for planar trapping of blood cells and microspheres
Proceedings of SPIE, the International Society for Optical Engineering 2013 DOI
Pål Løvhaugen,
Balpreet Singh Ahluwalia,
Thomas Rolf Huser,
Olav Gaute Hellesø
:
Serial Raman spectroscopy of particles trapped on a waveguide
Olav Gaute Hellesø,
Pål Løvhaugen,
Ananth Z. Subramanian,
James S. Wilkinson,
Balpreet Singh Ahluwalia
:
Surface transport and stable trapping of particles and cells by an optical waveguide loop
Lab on a Chip 2012 DOI
Pål Løvhaugen,
Balpreet Singh Ahluwalia,
Thomas Rolf Huser,
Peter Anthony Mccourt,
Olav Gaute Hellesø
:
Optical trapping forces on biological cells on a waveguide surface
Proceedings of SPIE, the International Society for Optical Engineering 2011 DOI
Pål Løvhaugen,
Balpreet Singh Ahluwalia,
Olav Gaute Hellesø
:
Optical waveguide trapping forces on hollow glass spheres
Proceedings of SPIE, the International Society for Optical Engineering 2011 DOI
Balpreet Singh Ahluwalia,
Pål Løvhaugen,
Olav Gaute Hellesø
:
Waveguide trapping of hollow glass spheres
Optics Letters 2011 DOI
Pål Løvhaugen,
Balpreet Singh Ahluwalia,
Thomas Rolf Huser,
Peter Anthony McCourt,
Olav Gaute Hellesø
:
Optical trapping forces on biological cells on a waveguide surface
SPIE - The International Society for Optics and Photonics 2011 SAMMENDRAG
Mathias Novik Jensen,
Benjamin Ricaud,
Olav Gaute Hellesø
:
De-noising and differentiation of low-SNR Raman-spectra of EV's
2022
Mathias Novik Jensen,
Olav Gaute Hellesø
:
Raman characterisation of UV-written silica waveguides
2022
Marek Vlk,
Md Rabiul Hasan,
Olav Gaute Hellesø
:
Dielectric metasurface for optical trapping of nanoparticles
2022
Marek Vlk,
Md Rabiul Hasan,
Mathias Novik Jensen,
Olav Gaute Hellesø
:
Optical Metasurfaces and Waveguide Chips for Trapping and Raman Spectroscopy
2022
Md Rabiul Hasan,
Olav Gaute Hellesø
:
Trapping of biological nanoparticles by quasi-bound state in the continuum
2022
Md Rabiul Hasan,
Marek Vlk,
Olav Gaute Hellesø
:
Simulation of trapping by quasi-bound state in the continuum
2022
Øystein Ivar Helle,
Firehun Tsige Dullo,
Marcel Lahrberg,
Jean-Claude Tinguely,
Olav Gaute Hellesø,
Balpreet Singh Ahluwalia
:
Photonic chip-based optical nanoscopy
2021
Mukesh Yadav,
Jana Jágerská,
Jørn H Hansen,
Olav Gaute Hellesø
:
Sensitivity and response time of an on-chip methane sensor
2017
Jana Jágerská,
Firehun Tsige Dullo,
Susan M. Lindecrantz,
Jacqueline Boergers,
Jørn H Hansen,
Laura Gomez Lechuga
et al.:
Cryptophane-Cladded Interferometric Waveguide Sensor for Aqueous Methane Detection
2017
Martin Ingvaldsen,
Jana Jágerská,
Firehun Tsige Dullo,
Susan M. Lindecrantz,
Magnus Engqvist,
Jørn H Hansen
et al.:
Cryptophane-A doped polymers for methane sensing
2016
Jana Jágerská,
Firehun Tsige Dullo,
Martin Ingvaldsen,
Susan M. Lindecrantz,
Magnus Engqvist,
Jørn H Hansen
et al.:
On-chip methane sensors based on cryptophane-A cladded waveguide interferometers
2016
Jana Jágerská,
Firehun Tsige Dullo,
Martin Ingvaldsen,
Susan M. Lindecrantz,
Magnus Engqvist,
Jørn H Hansen
et al.:
On-Chip Methane Sensing with Cryptophane-A Cladded Waveguide Interferometers
2016
Jana Jágerská,
Firehun Tsige Dullo,
Martin Ingvaldsen,
Susan M. Lindecrantz,
Jørn H Hansen,
Stian Solbø
et al.:
On-chip methane sensing with a cryptophane-A cladded Mach-Zehnder interferometer
2016
Firehun Tsige Dullo,
Susan Lindecrantz,
Olav Gaute Hellesø,
Stian Solbø
:
Optical Waveguide Interferometer for Measuring Methane Concentration
2013
Susan Lindecrantz,
Olav Gaute Hellesø
:
Analysis of Homogeneous Sensitivity of Rib-waveguides of Mach-Zehnder Interferometer
2012
Susan Lindecrantz,
Olav Gaute Hellesø
:
Design of waveguide Mach-Zehnder Interferometer sensor for subsea detection of methane
2011
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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
Have been teaching FYS-1003 Experimental physics, FYS-2008 Measurement techniques and FYS-3009 Photonics. Not currently teaching because of duties as head of department.