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A tunable flat terahertz lens using Dirac semimetals: a simulation study.
P Panahianfar1, B Rezaei2, A Darafsheh3
1Department of Condensed Matter Physics, Faculty of Physics, University of Tabriz, Tabriz, Iran.
Scientific Reports
|March 2, 2024
Summary
We designed a tunable terahertz lens using a photonic crystal made of Dirac semimetal rods. This flat lens offers adjustable refractive index for advanced terahertz applications.
Area of Science:
- Photonics
- Materials Science
- Electromagnetism
Background:
- Terahertz (THz) technology requires efficient and tunable optical components.
- Photonic crystals offer unique light manipulation capabilities.
- Dirac semimetals exhibit tunable electronic and optical properties.
Purpose of the Study:
- To propose and design a flat and tunable terahertz lens.
- To utilize a two-dimensional photonic crystal composed of Dirac semimetal rods.
- To achieve tunability through variations in the Dirac semimetal's Fermi energy level.
Main Methods:
- Designing a graded index photonic crystal with varying rod radii.
- Employing Dirac semimetals for their tunable refractive index properties.
- Simulating electromagnetic wave interaction using the 2D finite-difference time-domain (FDTD) method.
Main Results:
- Demonstration of a flat lens design for terahertz frequencies.
- Achieved tunability of the lens by altering the Dirac semimetal's Fermi energy.
- Investigated electromagnetic wave propagation for both transverse magnetic (TM) and transverse electric (TE) polarizations.
Conclusions:
- The proposed Dirac semimetal photonic crystal lens is flat and tunable.
- This design offers a novel approach for terahertz optical component development.
- The tunable refractive index of Dirac semimetals is key to the lens's functionality.
