Water-walled microfluidics for high-optical finesse cavities

Nature Communications
Shai MaayaniTal Carmon

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.

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Citations

Feb 6, 2017·Optics Express·Lucía Labrador-PáezLeopoldo L Martin
Dec 2, 2017·Scientific Reports·Mark L DouvidzonTal Carmon
May 15, 2020·Optics Express·Aram LeeSunghwan Jung
Jul 15, 2016·Optics Express·Sarah T AttarTal Carmon
Jun 20, 2017·Advanced Materials·Kevin D HeylmanRandall H Goldsmith
Mar 4, 2020·Optics Express·Qijing LuShusen Xie
Aug 10, 2017·Optics Express·Rafino M J MurphySíle Nic Chormaic
Aug 17, 2018·Optics Express·Daniel Bar-DavidTal Carmon
Feb 9, 2017·Scientific Reports·A GiorginiG Gagliardi
Oct 20, 2020·Advanced Materials Interfaces·Ryan M CamachoGregory P Nordin
Feb 28, 2021·Light, Science & Applications·Nikita ToropovFrank Vollmer
May 22, 2020·ACS Applied Materials & Interfaces·Han ZhangYuze Sun

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