Tunable Polarization Magnetooptical Effects at Scattering of Terahertz Radiation from Graphene Nanoribbon Gratings in a Magnetic Field.
Saved in:
| Title: | Tunable Polarization Magnetooptical Effects at Scattering of Terahertz Radiation from Graphene Nanoribbon Gratings in a Magnetic Field. |
|---|---|
| Authors: | Makeeva, G. S.1 (AUTHOR) radiotech@pnzgu.ru, Nikitin, M. S.1 (AUTHOR) |
| Source: | Journal of Experimental & Theoretical Physics. Jun2025, Vol. 140 Issue 4-6, p120-130. 11p. |
| Subjects: | Magnetooptics, Magnetic fields, Nanoribbons, Diffraction patterns, Plasmonics, Submillimeter waves, Numerical analysis, Linear polarization |
| Abstract: | The aim of the work is a numerical investigation of the features of resonant (due to the excitation and propagation of plasmonic excitations) polarization magnetooptical (MO) effects and methods for controlling the polarization of THz radiation upon scattering from graphene nanoribbon gratings in an external magnetic field. Graphene is a 2D material with unique optical and electronic properties. It serves as a platform for new THz applications and microminiature systems with new potentialities. The excitation of surface magnetoplasmon–polaritons with a dispersion relation changed due to applying external magnetic field significantly enhances MO effects in graphene structures. For the first time, a numerical study of polarization MO effects has been carried out by automated modeling methods using the CST MWS software package based on the solution (using the frequency domain finite element method) of the electrodynamic problem of diffraction of TEM wave on a graphene nanoribbon grating with the application of a perpendicular magnetic field and analysis of the diffracted field characteristics in the THz range. The results of modeling the 3D e‑Field scattering patterns of a normally incident p-polarized TEM wave on a unit cell of a graphene nanoribbon grating in a perpendicular external magnetic field at the plasmon resonance frequencies (at B0 = 0) and magnetoplasmon resonances for different values of B0 (2, 4, 7, and 10 T) have been obtained. Based on analysis of the results of calculating ratio Ex/Ey of the horizontal and vertical components of the diffracted field and the axial ratio (AR) at the cross section points (φ = 0°) of the main lobe of the 3D e-Field scattering patterns, the polarization type of the scattered THz radiation has been examined and the Faraday rotation angle of the polarization plane of the transmitted wave and the Kerr rotation angle describing the rotation of the polarization axis of the reflected wave have been calculated. It follows from the results of the numerical investigation that at the diffraction of a normally incident TEM wave with p-polarization on a cell of the graphene nanoribbon grating in an applied perpendicular external magnetic field at the frequencies of magnetoplasmon resonances, frequency-tunable MO-effects are observed: (1) rotation of the polarization plane of a linearly polarized wave transmitted through a magnetically biased graphene grating, when the wave vector of the incident wave is parallel to the vector of the external magnetic field (Faraday effect), while the Faraday rotation angle depends on the magnitude of the external magnetic field; (2) changes in the orientation of polarization and ellipticity of the reflected wave (polar MO Kerr effect); a linearly polarized THz wave reflected from magnetically biased graphene becomes elliptically polarized; in this case, the major axis of the polarization ellipse rotates through a certain angle with respect to the polarization plane of the incident THz radiation, which is proportional to the magnitude of the external magnetic field. [ABSTRACT FROM AUTHOR] |
| Copyright of Journal of Experimental & Theoretical Physics is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
|
Full text is not displayed to guests.
Login for full access.
|
|
| Abstract: | The aim of the work is a numerical investigation of the features of resonant (due to the excitation and propagation of plasmonic excitations) polarization magnetooptical (MO) effects and methods for controlling the polarization of THz radiation upon scattering from graphene nanoribbon gratings in an external magnetic field. Graphene is a 2D material with unique optical and electronic properties. It serves as a platform for new THz applications and microminiature systems with new potentialities. The excitation of surface magnetoplasmon–polaritons with a dispersion relation changed due to applying external magnetic field significantly enhances MO effects in graphene structures. For the first time, a numerical study of polarization MO effects has been carried out by automated modeling methods using the CST MWS software package based on the solution (using the frequency domain finite element method) of the electrodynamic problem of diffraction of TEM wave on a graphene nanoribbon grating with the application of a perpendicular magnetic field and analysis of the diffracted field characteristics in the THz range. The results of modeling the 3D e‑Field scattering patterns of a normally incident p-polarized TEM wave on a unit cell of a graphene nanoribbon grating in a perpendicular external magnetic field at the plasmon resonance frequencies (at B0 = 0) and magnetoplasmon resonances for different values of B0 (2, 4, 7, and 10 T) have been obtained. Based on analysis of the results of calculating ratio Ex/Ey of the horizontal and vertical components of the diffracted field and the axial ratio (AR) at the cross section points (φ = 0°) of the main lobe of the 3D e-Field scattering patterns, the polarization type of the scattered THz radiation has been examined and the Faraday rotation angle of the polarization plane of the transmitted wave and the Kerr rotation angle describing the rotation of the polarization axis of the reflected wave have been calculated. It follows from the results of the numerical investigation that at the diffraction of a normally incident TEM wave with p-polarization on a cell of the graphene nanoribbon grating in an applied perpendicular external magnetic field at the frequencies of magnetoplasmon resonances, frequency-tunable MO-effects are observed: (1) rotation of the polarization plane of a linearly polarized wave transmitted through a magnetically biased graphene grating, when the wave vector of the incident wave is parallel to the vector of the external magnetic field (Faraday effect), while the Faraday rotation angle depends on the magnitude of the external magnetic field; (2) changes in the orientation of polarization and ellipticity of the reflected wave (polar MO Kerr effect); a linearly polarized THz wave reflected from magnetically biased graphene becomes elliptically polarized; in this case, the major axis of the polarization ellipse rotates through a certain angle with respect to the polarization plane of the incident THz radiation, which is proportional to the magnitude of the external magnetic field. [ABSTRACT FROM AUTHOR] |
|---|---|
| ISSN: | 10637761 |
| DOI: | 10.1134/S1063776125700128 |
