Robust helix photo-transforming in soft matter.

Area of Science:

• Soft Condensed Matter Physics
• Organic Chemistry
• Materials Science

Background:

• Helical structures are fundamental in various soft materials, including DNA and liquid crystals.
• Controlling helicity dynamically with light in soft matter remains a significant challenge.

Purpose of the Study:

• To report a novel method for photo-transformation of helicity in soft matter.
• To achieve robust manipulation of helical pitch and chirality inversion using light.

Main Methods:

• Molecular design incorporating a multi-branched dendron-like chiral photoswitch.
• Balancing long-range order and short-range disorder states.
• Utilizing resonance coupling and inherent luminescence for stimulated circularly polarized luminescence (CPL).

Main Results:

• Achieved ultra-large helical twisting power (HTP) and a broad dynamic spectral range (400-3000 nm).
• Demonstrated robust manipulation of helical pitch and chirality inversion.
• Generated stimulated CPL with a dissymmetric factor of 1.97, near the theoretical limit.

Conclusions:

• The developed chiral photoswitch offers precise dynamic control over soft matter helicity.
• This approach enables photo-tailorable infrared beams and high-dimensional coding.
• Presents a robust strategy for advancements in dynamic soft matter, chiro-optics, and information processing.