Tailoring the optical properties of quantum ring irradiated by THz laser

ABSTRACT

This study set out to introduce the optical nonlinearities of a intense laser-driven two-dimensional quantum ring subjected to external uniform magnetic field. Inclusion of the effect of non-resonant, high-frequency THz laser radiation is realised by the laser-dressed potential, whereas the total optical absorption coefficients, total relative refractive index changes and third-harmonic generation (THG) coefficient are inferred from the scheme of compact density-matrix formalism and iterative method. Our results reveal that the laser field smoothens the antidot region of the ring that consequences with remarkable modifications in the electronic structure and correspondingly the optical response of the system. We have found that the height and location of the resonant peaks of total optical absorption coefficient, total relative refractive index changes and THG coefficient can be controlled by the externally applied fields and system parameters. The tunability of the intersubband transitions could be beneficial for practical device application relying on the electronic optical transitions.

KEYWORDS:

• Quantum ring
• THz laser field
• optical response

Acknowledgments

This paper is derived from the continuing PhD thesis of the first author, who is presently a student at Dokuz Eylül University.

Disclosure statement

No potential conflict of interest was reported by the authors.