Related Experiment Video
Updated: May 10, 2026
10:21
Multicolor Fluorescence Detection for Droplet Microfluidics Using Optical Fibers
Published on: May 5, 2016
Optofluidic-tunable color filters and spectroscopy based on liquid-crystal microflows
J G Cuennet1, A E Vasdekis, D Psaltis
1Optics Laboratory, School of Engineering, École Polytechnique Fédérale de Lausanne (EPFL), Switzerland.
Lab on a Chip
|June 12, 2013
Summary
Researchers developed tunable optofluidic filters using liquid crystal microflows for on-chip spectroscopic analysis. These filters simplify integration and tuning for lab-on-a-chip applications.
Area of Science:
- Optofluidics
- Materials Science
- Spectroscopy
Background:
- Microfluidic systems are increasingly integrated with color filters for on-chip analysis.
- Existing methods face challenges in integration, actuation, and tuning of filters.
- Liquid crystals offer tunable optical properties relevant for microfluidic applications.
Purpose of the Study:
- To describe tunable optofluidic filters based on liquid crystal microflows.
- To explore their application in on-chip absorption spectroscopy.
- To demonstrate simplified integration and tuning for lab-on-a-chip devices.
Main Methods:
- Utilized wavelength-dependent liquid crystal birefringence tuned by flow velocity fields.
- Modified flow velocity temporally (inlet pressure) and spatially (channel geometry).
- Integrated distance-dependent color filters with dye-filled poly(dimethylsiloxane) microfluidic systems.
Main Results:
- Demonstrated tunable color filters based on liquid crystal microflows.
- Successfully measured the absorption spectrum of a dye using the integrated system.
- Showcased the feasibility of on-chip absorption spectroscopy.
Conclusions:
- Liquid crystal microflows provide a simplified approach for optofluidic integration.
- These filters offer tunable and spatially controllable optical properties.
- The developed system advances lab-on-a-chip spectroscopic applications.
