Dr. Morten Gersborg Hansen Profile

Dr. Morten Gersborg Hansen

at Danmarks Tekniske Univ

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Publications (7)

Proceedings Article | 9 September 2008 Paper

Optofluidic evanescent sensing by polymer photonic crystal band edge lasers

Mads Brøkner Christiansen, Felipe Bernal Arango, Morten Gersborg-Hansen, Anders Kristensen

Proceedings Volume 7039, 70390F (2008) https://doi.org/10.1117/12.794723

KEYWORDS: Refractive index, Polymers, Photonic crystals, Cladding, Etching, Laser crystals, Waveguides, Reactive ion etching, Photorefractive polymers, Nanolithography

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Proceedings Article | 11 September 2007 Paper

Diffusive and convective dye replenishment in optofluidic light sources

Morten Gersborg-Hansen, Niels Asger Mortensen, Anders Kristensen

Proceedings Volume 6645, 66451E (2007) https://doi.org/10.1117/12.732411

KEYWORDS: Diffusion, Microfluidics, Dye lasers, Optical pumping, Molecules, Liquids, Light sources, Luminescence, Convection, Lab on a chip

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Optofluidic dye lasers have recently attracted much interest as potentially efficient light sources for integration on lab-on-a-chip micro-systems. However, dye bleaching resulting in limited life-time could limit the applications of such devices in lab-on-a-chip technology. Typically, the problem of dye bleaching is addressed by employing a continuous convective flow of liquid-dissolved dye molecules, compensating the bleaching caused by the external optical pump. In previously reported optofluidic light sources the required convective dye replenishing flow has been achieved by external fluid handling apparatus (syringe pumps), on-chip microfluidic pumps, or by means of capillary effect. We have investigated the bleaching dynamics that occur in optofluidic light sources where a liquid laser dye in a micro-fluidic channel is locally bleached due to optical pumping. A simple one-dimensional diffusion model is used to explore the characteristic evolution of the local un-bleached dye concentration in the optically pumped or bleached volume of the device. In the absence of convective flow, the decay of the local dye concentration in the optically pumped volume is governed by the diffusion rate and the resulting lifetime of the device is mainly limited by the capacity of the fluidic reservoirs. Generic microfluidic platforms typically allow for device layouts with a large volume ratio between the fluidic reservoir and the region being optically pumped. These conclusions drawn from the simple model are supported by basic experiments. Our investigations reveal the possibility that such optofluidic dye laser devices may potentially be operated for days by diffusion without the need for a convective flow. Relying on diffusion rather than convection to generate the necessary dye replenishment significantly simplifies optofluidic dye laser device layouts, omitting the need for cumbersome and costly external fluidic handling or on-chip microfluidic pumping devices.

Proceedings Article | 11 September 2007 Paper

Capillary driven tunable optofluidic DFB dye lasers

Morten Gersborg-Hansen, Anders Kristensen

Proceedings Volume 6645, 66451I (2007) https://doi.org/10.1117/12.733056

KEYWORDS: Dye lasers, Refractive index, Laser resonators, Polymers, Capillaries, Resonators, Reflection, Liquids, Pulsed laser operation, Microfluidics

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Proceedings Article | 22 January 2007 Paper

Diffusion dynamics in microfluidic dye lasers

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

Proceedings Volume 6465, 646506 (2007) https://doi.org/10.1117/12.700117

KEYWORDS: Diffusion, Dye lasers, Liquids, Molecules, Luminescence, Microfluidics, Optical pumping, Polymers, Rhodamine, Fluid dynamics

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Proceedings Article | 7 September 2006 Paper

Single-mode and tunable microfluidic dye lasers

A. Kristensen, S. Balslev, M. Gersborg-Hansen, B. Bilenberg, T. Rasmussen, D. Nilsson

Proceedings Volume 6329, 632901 (2006) https://doi.org/10.1117/12.680646

KEYWORDS: Microfluidics, Dye lasers, Mirrors, Refractive index, Bioalcohols, Rhodamine, Laser resonators, Resonators, Polymers, Waveguides

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Proceedings Article | 20 May 2005 Paper

Automatic video surveillance of outdoor scenes using track before detect

Morten Hansen, Helge Sorensen, Christian Birkemark, Bjarne Stage

Proceedings Volume 5778, (2005) https://doi.org/10.1117/12.601989

KEYWORDS: Video surveillance, Video, Surveillance, Surveillance systems, Binary data, Cameras, Automatic tracking, Homeland security, Denoising, Environmental monitoring

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Proceedings Article | 8 December 2004 Paper

Polymer-based lab-on-a-chip lasers

A. Kristensen, S. Balslev, B. Bilenberg, M. Gersborg-Hansen, D. Nilsson

Proceedings Volume 5591, (2004) https://doi.org/10.1117/12.577620

KEYWORDS: Dye lasers, Polymers, Microfluidics, Laser resonators, Lab on a chip, Polymer multimode waveguides, Polymer thin films, Microsystems, Planar waveguides, Waveguides

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Showing 5 of 7 publications

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