Arrayed dual-mode integrated liquid crystal microlens driven jointly by both independent signal voltages

Area of Science:

• Optics and Photonics
• Materials Science
• Electrical Engineering

Background:

• Traditional liquid crystal microlens arrays (LCMLAs) have limitations in light control flexibility and tunable range.
• Existing LCMLAs often require complex structures or multiple layers for advanced optical functions.

Purpose of the Study:

• To propose and investigate a new dual-mode integrated liquid crystal microlens array (LCMLA) using a single-layered LC material.
• To demonstrate enhanced light control capabilities, including flexible adjustment between beam convergence and divergence modes.
• To improve the tunable voltage range, focal length, and beam quality compared to traditional LCMLAs.

Main Methods:

• Fabrication of a dual-mode integrated LC microlens featuring a concentric microhole electrode and a central plate electrode.
• Electrical driving of the LC microlens by independently tuning signal voltages applied to the microhole and central plate electrodes.
• Characterization of optical properties, including focal length, beam convergence/divergence, and focal spot reduction.

Main Results:

• The dual-mode integrated LC microlens achieved flexible adjustment between convergence and divergence modes.
• Enlarged tunable voltage range and focal length were observed, along with reduced focal spot size.
• The electric-field filling factor of the LCMLA was significantly increased through joint voltage tuning.

Conclusions:

• The proposed single-layered, dual-mode integrated LCMLA offers superior light control and optical performance.
• This technology provides a robust foundation for the continuous development of advanced LCMLA devices.
• The ability to tune convergence and divergence modes opens new possibilities for optical system design.