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Updated: Jun 22, 2026

Multicolor Fluorescence Detection for Droplet Microfluidics Using Optical Fibers

Multicolor Fluorescence Detection for Droplet Microfluidics Using Optical Fibers

Published on: May 5, 2016

Mechanically tunable optofluidic distributed feedback dye laser.

Zhenyu Li¹, Zhaoyu Zhang, Axel Scherer

¹Department of Electrical Engineering, California Institute of Technology, Pasadena, California 91125, USA. zhenyu@caltech.edu

|June 17, 2009

Summary

This summary is machine-generated.

This study demonstrates a tunable optofluidic distributed feedback (DFB) dye laser on a PDMS chip. Mechanical stretching tunes the laser frequency, achieving a 60 nm range for spectroscopy applications.

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Area of Science:

Optofluidics
Laser Technology
Materials Science

Background:

Optofluidic distributed feedback (DFB) dye lasers offer tunable light sources.
Poly(dimethylsiloxane) (PDMS) is a suitable material for microfluidic devices due to its elastomeric properties.

Purpose of the Study:

To demonstrate a continuously tunable optofluidic DFB dye laser on a monolithic PDMS chip.
To explore the potential of mechanical tuning for laser frequency adjustment.

Main Methods:

Fabrication of a DFB dye laser on a PDMS chip using replica molding.
Incorporation of a phase-shifted higher order Bragg grating within a single-mode buried channel waveguide.
Mechanical stretching of the PDMS chip to tune the grating period and laser frequency.

Main Results:

Achieved a continuous tuning range of nearly 60 nm using Rhodamine 6G and Rhodamine 101 dyes.
Maintained single-mode operation with a linewidth below 0.1 nm.
Demonstrated an array of five DFB dye lasers with varying grating periods on a single chip.

Conclusions:

The demonstrated optofluidic DFB dye laser offers a wide, tunable output spectrum from near UV to near IR.
The tunable integrated laser arrays are promising for inexpensive, advanced spectroscopy chips.