Programmed Self-Assembly of Single Colloidal Gyroids for Chiral Photonic Crystals

Area of Science:

• Materials Science
• Nanotechnology
• Photonics

Background:

• Gyroid structures are crucial for chiroptics and topological photonics.
• Self-assembly of single-network gyroids has been a significant challenge.
• Existing methods struggle with precise control over gyroid enantiomorphs.

Purpose of the Study:

• To demonstrate the programmed self-assembly of single colloidal gyroid enantiomorphs.
• To design and synthesize chiral colloidal patchy spheres for this purpose.
• To explore the photonic properties of the assembled single gyroid structures.

Main Methods:

• Rational design of chiral colloidal patchy spheres with specific patch geometries.
• In silico simulation of two distinct self-assembly routes.
• Characterization of the assembled single colloidal gyroid structures and their photonic properties.

Main Results:

• Successful programmed self-assembly of enantiomorphic single colloidal gyroids from designer patchy spheres.
• Demonstration of chiral spheres with either two staggered rectangular or four circular patches.
• Observation of a complete photonic bandgap and rich chiroptical properties in the single gyroid structures.

Conclusions:

• Single colloidal gyroids can be assembled using rationally designed chiral patchy spheres.
• These gyroids exhibit desirable photonic properties, including complete photonic bandgaps.
• Single colloidal gyroids present a viable alternative to colloidal diamond for photonic crystal applications.