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Design and Characteristics of an Optofluidic Phase Modulator Based on Dielectrowetting.
Zhongcheng Liang1, Wenxuan Ding1, Rui Zhao1
1The Microfluidic Optical Technology Research Center, School of Electronic and Optical Engineering, Nanjing University of Posts and Telecommunications, Nanjing 210023, China.
Langmuir : the ACS Journal of Surfaces and Colloids
|January 6, 2021
Summary
This study presents an optofluidic phase modulator using dielectrowetting to control optical phase. The device achieves a 9.366π phase modulation range by adjusting applied voltage.
Area of Science:
- Optofluidics
- Dielectrowetting
- Optical Phase Modulation
Background:
- Traditional optical phase modulators face limitations in tunability and integration.
- Dielectrowetting offers a novel approach for microfluidic control and interface manipulation.
Purpose of the Study:
- To design and fabricate an optofluidic phase modulator utilizing dielectrowetting.
- To investigate the quantitative relationship between applied voltage and optical phase shift.
- To demonstrate continuous optical phase adjustment through voltage control.
Main Methods:
- Fabrication of an optofluidic device with two immiscible liquids and a transparent sheet.
- Application of varying voltages to induce dielectrowetting and alter the liquid interface position.
- Development of a theoretical model to predict optical phase shifts.
- Experimental validation of the phase modulation capabilities.
Main Results:
- The dielectrowetting-based optofluidic modulator successfully adjusts optical phase.
- A theoretical model accurately predicts the phase shift based on voltage.
- Continuous optical phase modulation was achieved by varying the applied voltage.
- A maximum phase modulation range of 9.366π was experimentally demonstrated at 150 V.
Conclusions:
- The designed optofluidic phase modulator offers a viable method for tunable optical phase control.
- Dielectrowetting provides an effective mechanism for precise interface manipulation in optofluidic devices.
- The device shows potential for applications requiring dynamic optical phase adjustment.
