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Electro-optical phenomena based on ionic liquids in an optofluidic waveguide.

Xiaodong He¹, Qunfeng Shao, Pengfei Cao

¹School of Information Science and Engineering, Lanzhou University, No. 222 Tianshui South Road, Lanzhou 730000, China. zxp@lzu.edu.cn.

|January 14, 2015

Summary

This summary is machine-generated.

Optofluidic waveguides using ionic liquids (ILs) demonstrate voltage-controlled optical modulation. This electro-optical effect, driven by ion redistribution, enhances near-infrared light absorption near electrodes.

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Area of Science:

Optoelectronics
Materials Science
Nanotechnology

Background:

Optofluidic devices offer tunable optical properties.
Ionic liquids (ILs) exhibit unique electrical and optical characteristics.
Electric field manipulation of ILs can alter optical transmission.

Purpose of the Study:

Investigate the electro-optical modulation of optical transmission in optofluidic waveguides filled with ionic liquids.
Explore the influence of electrode geometry, wavelength, and IL properties on modulation efficiency.
Determine the underlying physical mechanism of the observed electro-optical phenomenon.

Main Methods:

Fabrication of optofluidic waveguides with two-terminal electrodes.
Application of DC electric fields (0-4 V) to ionic liquid-filled waveguides.
Optical transmission measurements at 663, 1330, and 1530 nm.
Comparison of modulation performance across seven different ionic liquids.

Main Results:

Significant electro-optical modulation observed at NIR wavelengths (1330 and 1530 nm), but not at 663 nm.
Modulation strength is position-dependent, strongest near electrode terminals, and influenced by voltage polarity.
Modulation amplitude (up to 6.0 dB for [Emim][BF4] at ±3.5 V) and response speed increase with applied voltage and IL conductivity.
Electro-optical phenomenon attributed to voltage-induced ion redistribution and subsequent changes in NIR optical absorption.

Conclusions:

Optofluidic waveguides with ionic liquids enable low-voltage, room-temperature optical modulation.
The observed electro-optical effect is primarily driven by carrier concentration changes due to ion redistribution.
This phenomenon holds potential for developing novel optical modulators and switches.