Tunable multichannel Fibonacci one-dimensional terahertz photonic crystal filter

Area of Science:

• Condensed Matter Physics
• Photonics and Optics
• Materials Science

Background:

• Terahertz (THz) optical filters are crucial for various spectroscopic and communication applications.
• Photonic crystals offer unique light manipulation capabilities, while Dirac semimetals exhibit exotic electronic properties.
• Integrating these materials presents opportunities for novel optical device functionalities.

Purpose of the Study:

• To propose and theoretically investigate a multichannel terahertz optical filter.
• To explore the tunability of optical properties using a bulk Dirac semimetal within a Fibonacci photonic crystal.
• To analyze the influence of structural parameters and incident light on filter performance.

Main Methods:

• Theoretical modeling of a one-dimensional photonic crystal incorporating a third-order Fibonacci structure and a bulk Dirac semimetal.
• Numerical simulation to study the optical transmission and frequency characteristics.
• Parametric analysis varying Fermi energy, periodic number, and incident angle of light.

Main Results:

• The proposed structure exhibits multichannel filtering properties in the terahertz regime.
• Optical channel frequency and transmission are significantly influenced by the Dirac semimetal's Fermi energy and the light's incident angle.
• Increasing the periodic number of the Fibonacci structure leads to an increase in the number of optical channels.

Conclusions:

• A tunable multichannel terahertz optical filter based on a Fibonacci photonic crystal with a Dirac semimetal is theoretically demonstrated.
• The filter's performance can be precisely controlled by adjusting the Fermi energy and incident angle, offering design flexibility.
• This work provides a pathway for developing advanced THz optical devices with tailored spectral responses.