Transmission through chiral twist defects in anisotropic periodic structures

Area of Science:

• Physics
• Optics
• Materials Science

Background:

• Photonic states are crucial for light manipulation.
• Understanding localized states in complex structures is challenging.
• Anisotropic materials offer unique optical properties.

Purpose of the Study:

• To investigate the existence and properties of long-lived photonic states.
• To analyze microwave transmission through a specific helical structure with defects.
• To compare experimental observations with theoretical simulations.

Main Methods:

• Microwave transmission measurements.
• Fabrication of a helical stack of anisotropic transparencies with twist defects.
• Computer simulations of polarized localized states.

Main Results:

• Observation of a long-lived photonic state.
• Experimental measurements agree with computer simulations when accounting for absorption and angular spread.
• The intensity of the localized mode shows no wavelength-scale modulation, differing from isotropic bandgaps.

Conclusions:

• Helical anisotropic structures can support long-lived localized photonic states.
• Simulations provide a reliable method for predicting transmission properties.
• The spatial intensity behavior of these states is distinct from conventional photonic bandgaps.