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      Photothermal generation of programmable microbubble array on nanoporous gold disks.

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          Abstract

          We present a novel technique to generate microbubbles photothermally by continuous-wave laser irradiation of nanoporous gold disk (NPGD) array covered microfluidic channels. When a single laser spot is focused on the NPGDs, a microbubble can be generated with controlled size by adjusting the laser power. The dynamics of both bubble growth and shrinkage are studied. Using computer-generated holography on a spatial light modulator (SLM), simultaneous generation of multiple microbubbles at arbitrary locations with independent control is demonstrated. A potential application of flow manipulation is demonstrated using a microfluidic X-shaped junction. The advantages of this technique are flexible bubble generation locations, long bubble lifetimes, no need for light-adsorbing dyes, high controllability over bubble size, and relatively lower power consumption.

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          Author and article information

          Journal
          Opt Express
          Optics express
          Optica Publishing Group
          1094-4087
          1094-4087
          Jun 25 2018
          : 26
          : 13
          Article
          390666
          10.1364/OE.26.016893
          30119508
          f484eb09-e0ce-4ff1-b202-f9037e0582e1
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