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37 results on '"Balslev, Søren"'

1. Real-time tunability of chip-based light source enabled by microfluidic mixing.

Author

Bilenberg, Brian, Rasmussen, Torben, Balslev, Søren, and Kristensen, Anders

Subjects
MICROFLUIDICS, RESONATORS, REACTION time, LIGHT sources, FLUID dynamics, FLUID mechanics, LASERS
Abstract

We demonstrate real-time tunability of a chip-based liquid light source enabled by microfluidic mixing. The mixer and light source are fabricated in SU-8 which is suitable for integration in SU-8-based laboratory-on-a-chip microsystems. The tunability of the light source is achieved by changing the concentration of rhodamine 6G dye inside two integrated vertical resonators, since both the refractive index and the gain profile are influenced by the dye concentration. The effect on the refractive index and the gain profile of rhodamine 6G in ethanol is investigated and the continuous tuning of the laser output wavelength is demonstrated using an ethanolic rhodamine 6G solution of 2×10-2 mol/l mixed with pure ethanol. This yields rhodamine 6G concentrations from 5×10-3 to 1.5×10-2 mol/l inside the laser resonators and a wavelength change of 10 nm with a response time of 110 s. [ABSTRACT FROM AUTHOR]

Published
2006
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2. Polymer dye lasers

Author

Balslev, Søren

Abstract

Formålet med dette Ph.D. arbejde har været at udvikle miniaturiserede polymer farvestoflasere, egnet til at blive integreret i mikrochips som også indeholder andre polymerstrukturer – som for eksempel kan findes i ”Laboratorie-på-en-chip” kredsløb. Lasernes funktion skal være at levere lys til meget følsomme sensorformål, og at undgå at skulle opliniere eksterne lyskilder til sensorer på polymerchips. En enkelt type gennemsigtig ”resist” (SU-8) er blevet brugt til at udvikle en række laserresonatorer i polymer. ”Resisten” er blevet formgivet via en række lithografiske teknikker: UV lithografi, elektronstrålelithografi og Röntgenstrålelithografi. Andre polymerer er også blevet formgivet via ”nanoimprint” lithografi for at skabe laserresonatorer. En række lasere, både baseret på et flydende forstærkningsmedium og et faststof forstærkningsrmedium er blevet udviklet. Laserne giver både lys i flere ”modes” og i een enkelt optisk ”mode”. Laserne er baseret på en mængde forskellige optiske egenskaber af polymer tyndfilm og vædsker. De praktiske muligheder for at integrere polymer farvestoflaserne demonstreres ved at integrere en mængde optiske og væske- komponenter på en enkelt chip sammen med en miniaturiseret farvestoflaser. The purpose of this project has been to develop miniaturized polymer dye lasers that can be integrated on microchips containing other polymer ”laboratory on a chip” circuitry. The envisioned function of the polymer dye lasers has been to deliver light for sensing purposes, either for wavelength dependent absorption or for interference based sensing, for example with integrated Mach-Zehnder interferometers.In order to develop this kind of lasers, the project has focused on using a single transparent type of resist (SU-8) that can be patterned via several methods. The methods that have been tried on this resist are UV lithography, electron beam lithography and X-ray lithography. Apart from SU-8, a few alternative polymer types have also been used for forming laser structures via nanoimprint lithography.Throughout the work, several laser resonator types have been fabricated in polymer materials. The resonators range from simple parallel mirror types to first order Bragg grating distributed feedback resonators. Through the optical characterization of the laser type range, the possibilities for forming such miniaturized polymer dye lasers are revealed.Some techniques for modelling micro-optical structures are presented as a suggestion of how to predict the behavior of miniaturized polymer dye lasers and micro-optical structures in general.Both lasers operating in multi-mode and single polarization lasers operating on pre-determined single mode wavelengths are demonstrated. The mode structure of the lasers are controlled by the design of the laser resonators. Integration of a miniaturized polymer dye laser is demonstrated in two examples where the laser delivers light to an absorption cell, which makes it possible to measure the wavelength selective absorption of the fluid in the cell.The findings presented in the thesis forms a basis for selection of laser design for new applications both with respect to integration and to further development of polymer dye laser light sources.

Published
2006

3. High order Bragg grating microfluidic dye laser

Author

Balslev, Søren and Kristensen, Anders

Subjects
Condensed Matter::Soft Condensed Matter, Physics::Optics, Physics::Atomic Physics
Abstract

We demonstrate a single mode distributed feedback liquid dye laser, based on a short 133 'rd order Bragg grating defined in a single polymer layer between two glass substrates.

Published
2004
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4. Balslev, Søren

Author

Balslev, Søren and Balslev, Søren

Published
2012

6. Moralske dilemmaer i Prime Time

Author

Nielsen, Morten Ebbe Juul, Balslev, Søren Staal, Nielsen, Morten Ebbe Juul, and Balslev, Søren Staal

Published
2011

7. Kosmopolittens genkomst

Author

Balslev, Søren Staal and Balslev, Søren Staal

Abstract

Udgivelsesdato: 2009

Published
2009

9. Dommedag er nær!

Author

Balslev, Søren Staal and Balslev, Søren Staal

Published
2009

10. Bleaching and diffusion dynamics in optofluidic dye lasers

Author

Gersborg-Hansen, Morten, Balslev, Søren, Mortensen, Asger, Kristensen, Anders, Gersborg-Hansen, Morten, Balslev, Søren, Mortensen, Asger, and Kristensen, Anders

Abstract

The authors have investigated the bleaching dynamics that occur in optofluidic dye lasers where the liquid laser dye in a microfluidic channel is locally bleached due to optical pumping. They find that for microfluidic devices, the dye bleaching may be compensated through diffusion of dye molecules alone. By relying on diffusion rather than convection to generate the necessary dye replenishment, their observation potentially allows for a significant simplification of optofluidic dye laser device layouts, omitting the need for cumbersome and costly external fluidic handling or on-chip microfluidic pumping devices. ©2007 American Institute of Physics.

Published
2007

11. Diffusion dynamics in microfluidic dye lasers

Author

Gersborg-Hansen, Morten, Balslev, Søren, Mortensen, Niels Asger, Kristensen, Anders, Gersborg-Hansen, Morten, Balslev, Søren, Mortensen, Niels Asger, and Kristensen, Anders

Abstract

We have investigated the bleaching dynamics that occur in opto-fluidic dye lasers, where the liquid laser dye in a channel is locally bleached due to optical pumping. Our studies suggest that for micro-fluidic devices, the dye bleaching may be compensated through diffusion of dye molecules alone. By relying on diffusion rather than convection to generate the necessary dye replenishment, our observation potentially allows for a significant simplification of opto-fluidic dye laser device layouts, omitting the need for cumbersome and costly external fluidic handling or on-chip micro-fluidic pumping devices.

Published
2007

13. Real-time tunability of chip-based light source enabled by microfluidic mixing

Author

Olsen, Brian Bilenberg, Rasmussen, Torben, Balslev, Søren, Kristensen, Anders, Olsen, Brian Bilenberg, Rasmussen, Torben, Balslev, Søren, and Kristensen, Anders

Abstract

We demonstrate real-time tunability of a chip-based liquid light source enabled by microfluidic mixing. The mixer and light source are fabricated in SU-8 which is suitable for integration in SU-8-based laboratory-on-a-chip microsystems. The tunability of the light source is achieved by changing the concentration of rhodamine 6G dye inside two integrated vertical resonators, since both the refractive index and the gain profile are influenced by the dye concentration. The effect on the refractive index and the gain profile of rhodamine 6G in ethanol is investigated and the continuous tuning of the laser output wavelength is demonstrated using an ethanolic rhodamine 6G solution of 2×10–2 mol/l mixed with pure ethanol. This yields rhodamine 6G concentrations from 5×10–3 to 1.5×10–2 mol/l inside the laser resonators and a wavelength change of 10 nm with a response time of 110 s. ©2006 American Institute of Physics

Published
2006

14. Levitated droplet dye laser

Author

Azzouz, H., Alkafadiji, L., Balslev, Søren, Johansson, J., Mortensen, Niels Asger, Nilsson, S., Kristensen, Anders, Azzouz, H., Alkafadiji, L., Balslev, Søren, Johansson, J., Mortensen, Niels Asger, Nilsson, S., and Kristensen, Anders

Abstract

We present the first observation, to our knowledge, of lasing from a levitated, dye droplet. The levitated droplets are created by computer controlled pico-liter dispensing into one of the nodes of a standing ultrasonic wave (100 kHz), where the droplet is trapped. The free hanging droplet forms a high quality optical resonator. Our 750 nL lasing droplets consist of Rhodamine 6G dissolved in ethylene glycol, at a concentration of 0.02 M. The droplets are optically pumped at 532 nm light from a pulsed, frequency doubled Nd:YAG laser, and the dye laser emission is analyzed by a fixed grating spectrometer. With this setup we have achieved reproducible lasing spectra in the visible wavelength range from 610 nm to 650 nm. The levitated droplet technique has previously successfully been applied for a variety of bio-analytical applications at single cell level. In combination with the lasing droplets, the capability of this high precision setup has potential applications within highly sensitive intra-cavity absorbance detection. © 2006 Optical Society of America

Published
2006

15. Micro-Fluidic Dye Ring Laser - Experimental Tuning of the Wavelength and Numerical Simulation of the Cavity Modes

Author

Gersborg-Hansen, Morten, Balslev, Søren, Mortensen, Niels Asger, Kristensen, Anders, Gersborg-Hansen, Morten, Balslev, Søren, Mortensen, Niels Asger, and Kristensen, Anders

Abstract

We demonstrate wavelength tuning of a micro-fluidic dye ring laser. Wavelength tunability is obtained by controlling the liquid dye concentration. The device performance is modelled by FEM simulations supporting a ray-tracing view.

Published
2006

16. Single-mode solid-state polymer dye laser fabricated with standard I-line UV lithography

Author

Balslev, Søren, Mironov, Andrej, Nilsson, Daniel, Balslev, Søren, Mironov, Andrej, and Nilsson, Daniel

Abstract

We present single-mode solid-state polymer dye lasers fabricated with standard UV lithography. The lasers use a high-order Bragg grating and rely on index-tuning of a photosensitive polymer for waveguiding. The gain medium is Rhodamine 6G.

Published
2005

17. Fully integrated optical system for lab-on-a-chip applications

Author

Balslev, Søren, Olsen, Brian Bilenberg, Geschke, Oliver, Jørgensen, Anders Michael, Kristensen, Anders, Kutter, Jörg Peter, Mogensen, Klaus Bo, Snakenborg, Detlef, Balslev, Søren, Olsen, Brian Bilenberg, Geschke, Oliver, Jørgensen, Anders Michael, Kristensen, Anders, Kutter, Jörg Peter, Mogensen, Klaus Bo, and Snakenborg, Detlef

Abstract

We present a lab-on-a-chip device featuring a microfluidic dye laser, wave-guides, microfluidic components and photo-detectors integrated on the chip. The microsystem is designed for wavelength selective absorption measurements in the visible range on a fluidic sample, which can be prepared/mixed on-chip. The laser structures, wave-guides and micro-fluidic handling system are defined in a single UV-lithography step on a 10 μm thick SU-8 layer on top of the substrate. The SU-8 structures are sealed by a Borofloat glass lid, using polymethylmethacrylate (PMMA) adhesive bonding.

Published
2004

18. Microtas with integrated optical transducers

Author

Laurell, T., Nilsson, J., Jensen, K., Harrison, D.J., Kutter, Jörg Peter, Balslev, Søren, Olsen, Brian Bilenberg, Geschke, Oliver, Jørgensen, Anders Michael, Kristensen, Anders, Mogensen, Klaus Bo, Snakenborg, Detlef, Laurell, T., Nilsson, J., Jensen, K., Harrison, D.J., Kutter, Jörg Peter, Balslev, Søren, Olsen, Brian Bilenberg, Geschke, Oliver, Jørgensen, Anders Michael, Kristensen, Anders, Mogensen, Klaus Bo, and Snakenborg, Detlef

Published
2004

20. Integration of optics and microfluidics for a lab-on-a-chip system

Author

Jørgensen, Anders Michael, Balslev, Søren, Olsen, Brian Bilenberg, Geschke, Oliver, Kristensen, Anders, Kutter, Jörg Peter, Mogensen, Klaus Bo, Snakenborg, Detlef, Jørgensen, Anders Michael, Balslev, Søren, Olsen, Brian Bilenberg, Geschke, Oliver, Kristensen, Anders, Kutter, Jörg Peter, Mogensen, Klaus Bo, and Snakenborg, Detlef

Published
2004

21. Solid Polymer Dye Laser Based on a Single Mode SU-8 Planar Waveguide

Author

Laurell, T., Nilsson, J., Jensen, K., Harrison, D.J., Kutter, Jörg Peter, Nilsson, Daniel, Balslev, Søren, Kristensen, Anders, Laurell, T., Nilsson, J., Jensen, K., Harrison, D.J., Kutter, Jörg Peter, Nilsson, Daniel, Balslev, Søren, and Kristensen, Anders

Published
2004

22. Liquid droplet dye laser

Author

Laurell, T., Nilsson, J., Jensen, K., Harrison, D.J., Kutter, Jörg Peter, Azzouz, Hatim, Balslev, Søren, Kristensen, Anders, Laurell, T., Nilsson, J., Jensen, K., Harrison, D.J., Kutter, Jörg Peter, Azzouz, Hatim, Balslev, Søren, and Kristensen, Anders

Published
2004

24. A nanoimprinted microfluidic dye laser

Author

Nilsson, Daniel, Balslev, Søren, Nielsen, Theodor, Kristensen, Anders, Nilsson, Daniel, Balslev, Søren, Nielsen, Theodor, and Kristensen, Anders

Published
2004

25. 'Polymer based lab-on-a-chip lasers'

Author

Kristensen, Anders, Balslev, Søren, Olsen, Brian Bilenberg, Gersborg-Hansen, M., Nilsson, Daniel, Kristensen, Anders, Balslev, Søren, Olsen, Brian Bilenberg, Gersborg-Hansen, M., and Nilsson, Daniel

Published
2004

26. A Coupled Cavity Micro Fluidic Dye Ring Laser

Author

Gersborg-Hansen, M., Balslev, Søren, Mortensen, Niels Asger, Kristensen, Anders, Gersborg-Hansen, M., Balslev, Søren, Mortensen, Niels Asger, and Kristensen, Anders

Published
2004

27. Microfluidic dye laser with compact, low-cost liquid dye dispenser

Author

Laurell, T., Nilsson, J., Jensen, K., Harrison, D.J., Kutter, Jörg Peter, Balslev, Søren, Roxhed, N., Griss, P., Stemme, G., Kristensen, Anders, Laurell, T., Nilsson, J., Jensen, K., Harrison, D.J., Kutter, Jörg Peter, Balslev, Søren, Roxhed, N., Griss, P., Stemme, G., and Kristensen, Anders

Published
2004

28. µTAS with integrated optical transducers

Author

Balslev, Søren, Olsen, Brian Bilenberg, Geschke, Oliver, Jørgensen, Anders Michael, Kristensen, Anders, Kutter, Jörg Peter, Mogensen, Klaus Bo, Snakenborg, Detlef, Balslev, Søren, Olsen, Brian Bilenberg, Geschke, Oliver, Jørgensen, Anders Michael, Kristensen, Anders, Kutter, Jörg Peter, Mogensen, Klaus Bo, and Snakenborg, Detlef

Published
2004

29. Tunability of Microfluidic Dye Lasers

Author

Balslev, Søren, Azzouz, H., Olsen, Brian Bilenberg, Kristensen, Anders, Balslev, Søren, Azzouz, H., Olsen, Brian Bilenberg, and Kristensen, Anders

Published
2003

37. Microfluidic single-mode laser using high-order Bragg grating and antiguiding segments.

Author

Balslev S and Kristensen A

Abstract

We present a single-mode, single-polarization, distributed feedback liquid dye laser, based on a short high-order Bragg grating defined in a single polymer layer between two glass substrates. In this device we obtain single-mode operation in a multimode structure by means of transverse-mode discrimination with antiguiding segments. The laser is fabricated using microfabrication technology, is pumped by a pulsed frequency-doubled Nd:YAG laser, and emits narrow-line-width light in the chip plane at 577 nm. The output from the laser is coupled into integrated planar waveguides defined in the same polymer _lm. The laser device is thus well suited for integration, for example, into polymer based lab-on-a-chip microsystems.

Published
2005
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