34 research outputs found
A Coupled Cavity Micro Fluidic Dye Ring Laser
We present a laterally emitting, coupled cavity micro fluidic dye ring laser,
suitable for integration into lab-on-a-chip micro systems. The micro-fluidic
laser has been successfully designed, fabricated, characterized and modelled.
The resonator is formed by a micro-fluidic channel bounded by two isosceles
triangle mirrors. The micro-fluidic laser structure is defined using photo
lithography in 10 microns thick SU-8 polymer on a glass substrate. The micro
fluidic channel is sealed by a glass lid, using PMMA adhesive bonding. The
laser is characterized using the laser dye Rhodamine 6G dissolved in ethanol or
ethylene glycol as the active gain medium, which is pumped through the
micro-fluidic channel and laser resonator. The dye laser is optically pumped
normal to the chip plane at 532 nm by a pulsed, frequency doubled Nd:YAG laser
and lasing is observed with a threshold pump pulse energy flux of around 55
micro-Joule/square-milimeter. The lasing is multi-mode, and the laser has
switchable output coupling into an integrated polymer planar waveguide. Tuning
of the lasing wavelength is feasible by changing the dye/solvent properties.Comment: Accepted for Microelectronic Engineerin
Organic dye doped microstructures for optically active functional devices fabricated via two-photon polymerization technique
Liquid-infiltrated photonic crystals - enhanced light-matter interactions for lab-on-a-chip applications
Optical techniques are finding widespread use in analytical chemistry for
chemical and bio-chemical analysis. During the past decade, there has been an
increasing emphasis on miniaturization of chemical analysis systems and
naturally this has stimulated a large effort in integrating microfluidics and
optics in lab-on-a-chip microsystems. This development is partly defining the
emerging field of optofluidics. Scaling analysis and experiments have
demonstrated the advantage of micro-scale devices over their macroscopic
counterparts for a number of chemical applications. However, from an optical
point of view, miniaturized devices suffer dramatically from the reduced
optical path compared to macroscale experiments, e.g. in a cuvette. Obviously,
the reduced optical path complicates the application of optical techniques in
lab-on-a-chip systems. In this paper we theoretically discuss how a strongly
dispersive photonic crystal environment may be used to enhance the light-matter
interactions, thus potentially compensating for the reduced optical path in
lab-on-a-chip systems. Combining electromagnetic perturbation theory with
full-wave electromagnetic simulations we address the prospects for achieving
slow-light enhancement of Beer-Lambert-Bouguer absorption, photonic band-gap
based refractometry, and high-Q cavity sensing.Comment: Invited paper accepted for the "Optofluidics" special issue to appear
in Microfluidics and Nanofluidics (ed. Prof. David Erickson). 11 pages
including 8 figure
A coupled cavity microfluidic dye ring laser. 2005 Microelectron. Eng
Abstract We present a laterally emitting, coupled cavity micro-fluidic dye ring laser, suitable for integration into lab-on-a-chip micro-systems. The micro-fluidic laser has been successfully designed, fabricated, characterized and modelled. The resonator is formed by a micro-fluidic channel bounded by two isosceles triangle mirrors. The micro-fluidic laser structure is defined using photo lithography in 10 lm thick SU-8 polymer on a glass substrate. The micro-fluidic channel is sealed by a glass lid, using PMMA adhesive bonding. The laser is characterized using the laser dye Rhodamine 6G dissolved in ethanol or ethylene glycol as the active gain medium, which is pumped through the micro-fluidic channel and laser resonator. The dye laser is optically pumped normal to the chip plane at 532 nm by a pulsed, frequency doubled Nd:YAG laser and lasing is observed with a threshold pump pulse energy flux of around 55 lJ/mm 2 . The lasing is multi-mode, and the laser has switchable output coupling into an integrated polymer planar waveguide. Tuning of the lasing wavelength is feasible by changing the dye/solvent properties
Topology optimization using the finite volume method
This papers addresses the use of the finite volume method (FVM) for topology optimization of a heat conduction problem. Issues pertaining to the sensitivity analysis and the application of the FVM to non-homogeneous material distribuions are considered in some detail and example test problems are used to illustrate the effect of applying the FVM as an analysis tool for design optimization
Efficiency enhancement in a microcavity solid-state dye laser with Bragg grating reflectors
Characterization of channel waveguides and tunable microlasers in SU8 doped with rhodamine B fabricated using proton beam writing
10.1088/0022-3727/41/19/192002Journal of Physics D: Applied Physics4119-JPAP