Stretchable, flexible, rollable, and adherable polarization volume grating film

Area of Science:

• Optics and Photonics
• Materials Science
• Liquid Crystal Polymers

Background:

• Volume Bragg gratings (VBGs) are crucial optical components with applications in filters, wavelength multiplexing, and displays.
• Polarization volume gratings (PVGs) offer high efficiency, large deflection angles, and polarization selectivity, but lack tunability and flexibility.

Purpose of the Study:

• To develop a novel stretchable, flexible, and rollable PVG film.
• To investigate the tunability of PVG properties through mechanical stretching.
• To evaluate the potential of these PVGs for laser beam steering applications.

Main Methods:

• Fabrication of a flexible PVG film based on liquid crystal polymer.
• Mechanical stretching of the PVG film to induce tunable periodicity.
• Quantitative evaluation of Bragg reflection band shift and deflection angle changes.
• Assessment of mechanical robustness through stretch-release cycling.

Main Results:

• Demonstrated a stretchable, flexible, and rollable PVG film with high diffraction efficiency.
• Quantified the Bragg reflection band shift and deflection angle changes as a function of mechanical strain.
• Confirmed the mechanical robustness of the PVG film under repeated stretching and releasing.

Conclusions:

• The developed PVG film overcomes limitations of previous designs by offering flexibility and tunable periodicity.
• The tunable optical properties, particularly the deflection angle, show significant promise for laser beam steering.
• This flexible PVG technology opens new avenues for advanced, adaptable optical devices.