Variable optofluidic slit aperture

Stefan Schuhladen; Kaustubh Banerjee; Moritz Stürmer; Philipp Müller; Ulrike Wallrabe; Hans Zappe

doi:10.1038/lsa.2016.5

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Variable optofluidic slit aperture

Original Articles

- Variable optofluidic slit aperture
- Light: Science & Applications Vol. 5, Issue 1, (2016)
- Affiliations：
  
  1.Gisela and Erwin Sick Chair of Micro-optics, Department of Microsystems Engineering, University of Freiburg, Georges-Köhler-Allee 102, 79110 Freiburg, Germany
  2.Laboratory for Microactuators, Department of Microsystems Engineering, University of Freiburg, Georges-Köhler-Allee 102, 79110 Freiburg, Germany
- Author bio：
  
  H Zappe, Email: zappe@imtek.uni-freiburg.de
- Funds：
- DOI：10.1038/lsa.2016.5
  CLC：
- Published：2016-03，
  
  Published Online：23 August 2015，
  
  Received：08 April 2015，
  
  Revised：13 July 2015，
  
  Accepted：23 July 2015
- Accepted：
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Schuhladen, S. et al. Variable optofluidic slit aperture. Light: Science & Applications, 5, e16005 (2016).
DOI：

Schuhladen, S. et al. Variable optofluidic slit aperture. Light: Science & Applications, 5, e16005 (2016). DOI： 10.1038/lsa.2016.5.

摘要

Abstract

The shape of liquid interfaces can be precisely controlled using electrowetting

an actuation mechanism which has been widely used for tunable optofluidic micro-optical components such as lenses or irises. We have expanded the considerable flexibility inherent in electrowetting actuation to realize a variable optofluidic slit

a tunable and reconfigurable two-dimensional aperture with no mechanically moving parts. This optofluidic slit is formed by precisely controlled movement of the liquid interfaces of two highly opaque ink droplets. The 1.5 mm long slit aperture

with controllably variable discrete widths down to 45 µm

may be scanned across a length of 1.5 mm with switching times between adjacent slit positions of less than 120 ms. In addition

for a fixed slit aperture position

the width may be tuned to a minimum of 3 µm with high uniformity and linearity over the entire slit length. This compact

purely fluidic device offers an electrically controlled aperture tuning range not achievable with extant mechanical alternatives of a similar size.

关键词

Keywords

electrowetting on dielectrics (EWOD)optofluidicsscanning slit aperturetunable

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