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Volume 96, Issue 8, 22 February 2010
We presented a tunable optofluidic dye laser with integrated elastomeric air-gap etalon controlled by air pressure. The chip was fabricated with polydimethylsiloxane(PDMS) via replica molding. It comprises a liquid waveguide and microscale air-gap mirrors providing the feedback. The lasing wavelength is chosen by the interference between two parallel PDMS-air interfaces inside the internal tunable air-gap etalon, of which pneumatic tuning can be realized by inflating the air-gap etalon with compressed air. This dye laser exhibits a pumping threshold of /pulse, a lasing linewidth of 3 nm, and a tuning range of 14 nm.
- BIOPHYSICS AND BIO-INSPIRED SYSTEMS
96(2010); http://dx.doi.org/10.1063/1.3327522View Description Hide Description
This paper describes an analysis of advancing motions of micro-objects with two flagella separated from a unicellular alga, Chlamydomonas reinhardtii. We harnessed their flagella as actuators of the micro-objects. The isolated flagella can be attached to microbeads and propel them. We found that the biflagellate beads tend to advance, while the uniflagellate microbeads only rotate. Our model for the motion of the biflagellate beads led to conditions for generating an advancing motion. This approach is important since it provides general guidelines for designing micro-objects driven by flagellalike actuators.