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.
• Achieving simultaneous flexibility and broad infrared transparency in hybrid materials presents a significant challenge.

Purpose of the Study:

• To develop a novel material overcoming the limitations of current flexible and transparent composites for infrared applications.
• To create a material platform combining glass-like optical properties with polymer-like mechanical characteristics.

Main Methods:

• Designed a S60Se40 chalcogenide glass with a dual-network architecture (chain-ring).
• Integrated a dynamic covalent network with heavy chalcogen elements (S, Se) to suppress multi-phonon absorption.
• Characterized optical transparency, mechanical properties (Young's modulus, tensile strain, elastic recovery), self-healing, and shape-memory behavior.

Main Results:

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

Conclusions:

• The S60Se40 chalcogenide glass overcomes the classic limitation of achieving both flexibility and broadband infrared transparency.
• The material's unique properties enable applications in IR deformable lenses for adaptive imaging and wavefront control.
• This versatile platform bridges the gap between optical glass performance and polymer mechanics, paving the way for soft infrared photonics.