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Scattering-Free and Fast Response Polymer Brush-Stabilized Liquid Crystals Beam Steering Using Surface-Initiated
Zhenyao Bian1, Zi Wang1, Hongbo Lu1
1Academy of Opto-Electric Technology, Special Display and Imaging Technology, Innovation Center of Anhui Province, National Engineering Laboratory of Special Display Technology, Anhui Province Key Laboratory of Measuring Theory and Precision Instrument, School of Instrument Science and Optoelectronics Engineering, Hefei University of Technology, Hefei 230009, China.
This study introduces a new polymer brush stabilized liquid crystal (PBSLC) technology for scattering-free optical beam steering. This innovation offers fast response times and tunable beam deflection, crucial for advanced optical systems.
Area of Science:
- Optoelectronics
- Materials Science
Background:
- Nonmechanical optical beam steering is vital for telecommunications, imaging, sensing, displays, and military applications.
- Polymer network liquid crystal (PNLC) beam steering offers fast response but suffers from scattering due to refractive index mismatch.
- Existing methods often require complex fabrication and expensive equipment.
Purpose of the Study:
- To develop a scattering-free, fast-response liquid crystal (LC) beam steering technology.
- To overcome the limitations of traditional PNLC beam steering devices.
- To demonstrate a cost-effective and industrially viable beam steering solution.
Main Methods:
- Utilized surface-initiated polymerization (SIP) to grow polymer brushes on the substrate's surface.
- Confined polymer network growth within the LC bulk to minimize interfacial scattering.
- Fabricated polymer brush stabilized liquid crystal (PBSLC) devices with specific period and cell gap dimensions.
Main Results:
- Achieved an average transmission rate of 88% with a low haze value of 6.91 in the visible spectrum.
- Demonstrated a steering angle of 0.16 and a diffraction efficiency of 80.3%.
- Obtained a fast response time close to 1 ms with tunable beam energy to the zeroth order at 35 Vrms.
Conclusions:
- The developed PBSLC technology provides scattering-free, fast-response optical beam steering.
- The method is cost-effective, requiring only basic equipment and enabling easy control over steering angles and diffraction efficiency.
- PBSLC beam steering shows significant potential for industrial production and advanced optical applications.
