Super strong wide TM Mie bandgaps tolerating disorders

Area of Science:

• Photonics and Metamaterials
• Optical Engineering
• Materials Science

Background:

• Metamaterials offer unique optical properties due to their subwavelength structures.
• Controlling light propagation through metamaterials is crucial for optical device development.
• Structural disorder can significantly impact the performance of optical metamaterials.

Purpose of the Study:

• To investigate the appearance and tolerance of Mie bandgaps in tellurium, germanium, and silicon metamaterials.
• To explore the impact of rod position and radius disorder on transverse magnetic (TM) polarized light.
• To design waveguides using robust Mie bandgap properties in germanium metamaterials.

Main Methods:

• Fabrication and characterization of metamaterials composed of tellurium, germanium, and silicon rods in air.
• Analysis of Mie bandgap modes under varying degrees of rod position and radius disorder.
• Numerical simulations to design ultra-narrow waveguides based on observed metamaterial properties.

Main Results:

• Tellurium and germanium metamaterials exhibit Mie bandgaps that tolerate significant rod position and radius disorder.
• Germanium metamaterials were used to design ultra-narrow straight, L-shaped, and crossing waveguides.
• Silicon metamaterials show broadband Mie bandgaps with high tolerance to disorder, unlike the disappearance of certain modes in higher refractive index materials.

Conclusions:

• The strong tolerance of TM modes to disorder in tellurium, germanium, and silicon metamaterials is demonstrated.
• These findings pave the way for designing compact, efficient, and manufacturable optical devices.
• The study highlights the potential for integrated optical circuits using these robust metamaterial designs.