Optical properties of a quantum well with Razavy confinement potential: Role of applied external fields
Date
29 july 20Metadata
Show full item recordAbstract
In this present work, the effect of applied external fields and well width on the optical absorption and
refractive index change coefficient of a GaAs quantum well with Razavy confinement potential is theoretically
presented. For this, firstly, the confined subband energy levels of the structure and the envelope wave functions
corresponding to these states have been computed using the diagonalization method within the framework of
effective mass and parabolic band approximation. Then, by using this information, the coefficients of total –
linear plus nonlinear – intersubband optical absorption (TOAC) and relative refractive index changes (RRIC)
of the structure are evaluated. The obtained numerical results show that the increase in the magnitude of the
applied external fields creates a blue shift in TOAC and RRIC. Also, contrarily to the applied external fields,
an increment of the quantum well width have induced a red shift in the TOAC and RRIC. We discuss in detail
the variation of the diagonal matrix elements and the energy difference (E2–E1) which are responsible for
the change of amplitudes of the calculated coefficients. We believe that the obtained numerical results can be
useful in the design and application of the next generation devices used in the optoelectronics field.