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$Fabrication of Refractive-index-matched Devices for Biomedical Microfluidics$

Fabrication of Refractive-index-matched Devices for Biomedical Microfluidics

Published on: September 10, 2018

Tunable optofluidic birefringent lens.

D Wee¹, S H Hwang, Y S Song

¹Research Institute of Advanced Materials (RIAM), Department of Materials Science and Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul, 08826, Republic of Korea. jaeryoun@snu.ac.kr.

|April 2, 2016

Summary

This study demonstrates an optofluidic lens using liquid crystal interfaces. The lens

Area of Science:

Optofluidics
Liquid Crystal Physics
Microfluidics

Background:

Optofluidic devices offer tunable optical properties.
Liquid-liquid interfaces can be engineered for optical applications.
Nematic liquid crystals (NLCs) exhibit anisotropic optical behavior.

Purpose of the Study:

To demonstrate an optofluidic birefringent lens using hydrodynamic liquid-liquid (L(2)) interfaces.
To investigate the optical characteristics of the L(2) lens under electric field control.
To evaluate the lens' performance using experimental and numerical methods.

Main Methods:

Fabrication of an optofluidic microchannel device.
Utilizing nematic liquid crystal (NLC) and an optically isotropic fluid.

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Applying an electric field perpendicular to the flow direction.

Experimental characterization and numerical simulations (hydrodynamic theory of NLCs, ray-tracing model).

Main Results:

The L(2) interface acts as a tunable birefringent lens.
Electric field reorients NLCs, overcoming viscous stress.
Polarization of incident light (s- vs. p-polarized) affects focal length.
Successful evaluation of lens curvatures and focal lengths.

Conclusions:

Optofluidic birefringent lenses can be realized using L(2) interfaces.
Tunable optical properties are achieved through electric field control of NLC orientation.
The developed model accurately predicts the lens' optical behavior.