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A Liquid Optical Phase Shifter with an Embedded Electrowetting Actuator.

Alireza Ousati Ashtiani1, Hongrui Jiang2

  • 1Department of Electrical and Computer Engineering, University of Wisconsin-Madison, Madison, WI 53706 USA.

Journal of Microelectromechanical Systems : a Joint IEEE and ASME Publication on Microstructures, Microactuators, Microsensors, and Microsystems
|October 18, 2017
PubMed
Summary
This summary is machine-generated.

We developed an electrowetting liquid optical phase shifter using immiscible liquids and a movable membrane. This device achieved a 171° phase shift, demonstrating its potential for optical applications.

Keywords:
Optical modulationelectrooptic modulatorselectrowettingphase shifter

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Area of Science:

  • Optoelectronics
  • Microfluidics
  • Materials Science

Background:

  • Optical phase shifters are crucial components in various photonic systems.
  • Existing phase shifter technologies often face limitations in tunability, size, or power consumption.
  • Electrowetting offers a promising mechanism for microscale fluid manipulation and tunable optical devices.

Purpose of the Study:

  • To demonstrate a novel electrowetting-based liquid optical phase shifter.
  • To investigate the phase shifting capabilities of a device utilizing immiscible liquid layers and a movable membrane.
  • To integrate a miniaturized electrowetting actuator for precise control of hydraulic pressure.

Main Methods:

  • Fabrication of a device comprising two immiscible liquid layers with differing refractive indices, separated by a movable rigid membrane.
  • Utilizing a miniaturized electrowetting-based actuator to generate hydraulic pressure, altering the liquid layer thicknesses.
  • Integration of the fabricated device into a Mach-Zehnder interferometer for optical characterization.

Main Results:

  • The electrowetting device successfully induced a difference in optical path by changing liquid layer thicknesses.
  • A significant phase shift of 171° was observed when the device was operated at 100 V.
  • The device demonstrated effective optical phase modulation through controlled hydraulic pressure.

Conclusions:

  • Electrowetting provides an effective method for creating tunable liquid optical phase shifters.
  • The demonstrated device shows potential for integration into advanced optical systems requiring precise phase control.
  • Further development could lead to compact and efficient optical modulation components.