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Area of Science:

  • Photonics
  • Condensed Matter Physics
  • Integrated Optics

Background:

  • Valley Hall photonic crystals (VPCs) are promising for topological waveguides in terahertz integrated circuits.
  • Traditional VPC designs are limited to specific bend angles (0°, 60°, 120°) due to crystalline symmetry, hindering arbitrary interconnects.
  • Lack of arbitrary bend interconnects is a key limitation for terahertz-scale integrated VPC devices.

Purpose of the Study:

  • To present an on-chip, all-silicon implementation of deformed VPCs enabling robust transmission along arbitrary shapes and bends.
  • To demonstrate the functionality of amorphous topological photonic crystals as frequency-dependent routers.
  • To showcase on-chip terahertz communication using these novel photonic structures.

Main Methods:

  • Implementation of deformed Valley Hall photonic crystals in an all-silicon platform.
  • Utilizing short-range order to sustain topological protection in amorphous lattices.
  • Demonstration of frequency-dependent routing and terahertz communication.

Main Results:

  • Robust light transmission achieved along arbitrary shapes and bends using deformed VPCs.
  • Amorphous topological photonic crystals function as frequency-dependent routers, splitting signals into perpendicular ports.
  • Successful on-chip terahertz communication demonstrated with data rates up to 72 Gbps.

Conclusions:

  • Amorphous topological photonic crystals enhance interconnect adaptability in terahertz integrated circuits.
  • Topological protection is maintained in amorphous lattices through short-range order.
  • The developed technology offers a promising pathway for advanced terahertz photonic integrated circuits with improved performance and flexibility.