Variable optofluidic slit aperture

Light, Science & Applications
Stefan SchuhladenHans Zappe

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.

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Citations

Jun 10, 2016·Micromachines·Kartikeya MishraFrieder Mugele
Jun 8, 2017·Advanced Materials·Hao ZengArri Priimagi
Sep 7, 2018·The Review of Scientific Instruments·Mohammad AbdoJan G Korvink
Oct 24, 2019·Physical Review. E·Mohsen TorabiYanbao Ma
Jan 18, 2020·Nature Communications·Aniruddha RayAydogan Ozcan
May 15, 2021·Optics Express·Pengpeng ZhaoHans Zappe
Mar 15, 2019·Langmuir : the ACS Journal of Surfaces and Colloids·Élfego Ruiz-Gutiérrez, Rodrigo Ledesma-Aguilar
Feb 13, 2020·ACS Applied Materials & Interfaces·Jia-Ji CaoQi-Dai Chen

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