Design, fabrication, and characterization of an optofluidic phase modulator array based on the piezoelectric effect

Current optofluidic systems often rely on external actuators for phase modulation, limiting integration and response speed. Prior research has shown that piezoelectric materials can induce structural deformation under electric fields. However, no prior work had resolved how to integrate piezoelectric ceramics into a compact optofluidic array. This gap motivated the development of a self-contained modulator using piezoelectric effects. Traditional phase modulators require complex setups, but this paper's approach proposes a novel design. The inverse piezoelectric effect is known to alter material dimensions, but its application in optofluidic arrays remains unexplored. This study introduces a triangular ceramic arrangement that may offer new modulation capabilities. The transparent liquid's deformation under voltage is a key innovation. This paper's contribution lies in combining piezoelectric deformation with optofluidic modulation.

The aim of this study is to develop an optofluidic phase modulator array that leverages the inverse piezoelectric effect. The specific problem addressed is the need for compact and efficient phase modulation in optofluidic systems. The motivation stems from limitations in current modulator designs that require external actuators. This paper proposes a self-contained modulator using piezoelectric ceramics arranged in a triangular configuration. The design allows for voltage-driven deformation of a transparent liquid. The study's goal is to demonstrate continuous optical phase adjustment through this setup. The authors test whether the proposed array can achieve significant phase modulation. The study also evaluates the modulation range and voltage dependence of the system.

The optofluidic phase modulator array is designed with three piezoelectric ceramics arranged in an equilateral triangle. Transparent liquid is introduced into the ceramic cavity to enable optical interaction. The inverse piezoelectric effect is utilized to induce length changes in the liquid. Voltage is applied to the ceramics to observe deformation. The setup includes a transparent liquid that responds to electric fields. The ceramics are fabricated using standard piezoelectric material processing. The array is tested under varying voltages from 0 to 135 V. Optical phase modulation is measured using interferometric techniques.

The modulator array demonstrates continuous optical phase adjustment when voltage is applied. At 135 V, the transparent liquid's length increases by 9.286 µm. This deformation corresponds to a phase modulation of approximately 9.685 π. The system's response is linear with applied voltage, indicating controllability. The maximum phase shift is achieved at the highest voltage tested. The transparent liquid's deformation is directly linked to the inverse piezoelectric effect. The array's performance is consistent across multiple trials. These results suggest the array's potential for optofluidic applications.

The authors conclude that the optofluidic phase modulator array successfully utilizes the inverse piezoelectric effect. The triangular ceramic arrangement allows for precise voltage-driven deformation. The transparent liquid's length change is directly proportional to the applied voltage. The system's ability to achieve up to 9.685 π phase modulation is a key finding. The results suggest that this design may offer advantages over traditional modulators. The study's findings are limited to the tested voltage range and material setup. Future work may explore different ceramic configurations or liquids. The authors propose that this modulator could be integrated into compact optofluidic systems.