Hydrodynamically reconfigurable optofluidic microlens with continuous shape tuning from biconvex to biconcave

Chaolong Fang, Bo Dai, Qiao Xu, Ran Zhuo, Qi Wang, Xu Wang, Dawei Zhang

Research output: Contribution to journalArticle

7 Citations (Scopus)
71 Downloads (Pure)

Abstract

This paper presents an in-plane hydrodynamically reconfigurable optofluidic microlens, which is formed by the laminar flow of two streams of a low-refractive-index fluid and two streams of a high-refractive-index fluid in the two microchannels connecting to an expansion chamber where the microlens finally forms. In the expansion chamber, the stream of high-refractive-index fluid, acting as core, is sandwiched by the two streams of low-refractive-index fluid, acting as cladding. The interfaces between the streams can be flexibly manipulated by controlling the flow rate ratio between the two fluids in real time. Thus, the biconvex and biconcave microlens with different curvatures can be formed. By adjusting the microlens, the light beam can be continuously manipulated from focusing to collimation and then to divergence. In the experiment, a wide focus tuning range from 2.75 (focusing) to - 1.21 mm (diverging) via collimation is achieved.

Original languageEnglish
Pages (from-to)888-897
Number of pages10
JournalOptics Express
Volume25
Issue number2
Early online date11 Jan 2017
DOIs
Publication statusPublished - 23 Jan 2017

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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