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Water-walled microfluidics for high-optical finesse cavities

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  • Shai Maayani

    (Technion—Israel Institute of Technology)

  • Leopoldo L. Martin

    (Technion—Israel Institute of Technology)

  • Tal Carmon

    (Technion—Israel Institute of Technology)

Abstract

In submerged microcavities there is a tradeoff between resonant enhancement for spatial water and light overlap. Why not transform the continuously resonating optical mode to be fully contained in a water microdroplet per se? Here we demonstrate a sustainable 30-μm-pure water device, bounded almost completely by free surfaces, enabling >1,000,000 re-circulations of light. The droplets survive for >16 h using a technique that is based on a nano-water bridge from the droplet to a distant reservoir to compensate for evaporation. More than enabling a nearly-perfect optical overlap with water, atomic-level surface smoothness that minimizes scattering loss, and ∼99% coupling efficiency from a standard fibre. Surface tension in our droplet is 8,000 times stronger than gravity, suggesting a new class of devices with water-made walls, for new fields of study including opto-capillaries.

Suggested Citation

  • Shai Maayani & Leopoldo L. Martin & Tal Carmon, 2016. "Water-walled microfluidics for high-optical finesse cavities," Nature Communications, Nature, vol. 7(1), pages 1-4, April.
    • Handle: RePEc:nat:natcom:v:7:y:2016:i:1:d:10.1038_ncomms10435
    DOI: 10.1038/ncomms10435
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