An infrared-transparent flexible glass for adaptive optics

Area of Science:

• Materials Science
• Optics
• Photonics

Background:

• Transparent, flexible composites are crucial for adaptive optics, bio-integrated sensing, and reconfigurable photonics.
• A key challenge is creating materials that are both flexible and transparent across the infrared spectrum.

Purpose of the Study:

• To develop a novel material overcoming the limitations of current flexible and transparent composites.
• To achieve broadband infrared transparency combined with polymer-like mechanical properties.

Main Methods:

• Designed a S60Se40 chalcogenide glass with a unique chain-ring dual-network architecture.
• Integrated a dynamic covalent network with heavy chalcogen elements (sulfur and selenium).
• Investigated optical properties, mechanical characteristics (Young's modulus, tensile strain, elastic recovery), self-healing, and shape-memory behavior.

Main Results:

• Achieved broadband transparency up to 21 μm by suppressing multi-phonon absorption.
• Demonstrated ultralow Young's modulus (≈0.0037 GPa), extreme tensile strain (~650%), and high elastic recovery (~80%).
• Observed autonomous self-healing and shape-memory behavior at room temperature.

Conclusions:

• The S60Se40 glass offers a versatile platform bridging glass-like optical performance with polymer-like mechanics.
• Applications include IR deformable lenses for adaptive imaging and wavefront control.
• Opens new avenues for soft infrared photonics and reconfigurable optical systems.