Ultra-wide frequency tuning range for optical properties in coaxial quantum well driven by intense laser field

Highlights: • Ultra-wide tuning range. The laser-dressing of CCQW exhibits great potential for ultra-wide frequency tuning range of the optical absorption coefficient and refractive index changes. • The anticrossing of energy levels. We propose a new physical explanation for the anticrossing of energy levels and prove that it is reasonable and can be used to explain the corresponding phenomenon. • Huge application. The dressing effects of an ILF on the confinement potential of CCQW may be significant for designing new ultra-wide tuning range of quantum well lasers, optical modulators and ultra-fast infrared detectors. A new approach for controlling intersubband transitions and optical properties of coaxial cylindrical quantum well is proposed. Considering the correct dressing effect for the confinement potential, the new ultra-wide tuning mechanism is based on the variation of quasibound states with the intensity of long-wavelength laser field. By means of the finite difference method, the results provide a new explanation for the anticrossing of energy levels and exhibit great potential for ultra-wide frequency tunability (ranging from terahertz to the mid-infrared region) of the optical absorption coefficient and refractive index changes by modulating the laser parameters and barrier thickness.