Rosdisham Endut
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Preferred name
Rosdisham Endut
Official Name
Rosdisham, Endut
Alternative Name
Endut, Rosdisham
Endut, R.
Main Affiliation
Scopus Author ID
57189347166
Researcher ID
ABC-3290-2020

Research Output
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Linear and nonlinear optical properties of symmetric and asymmetric double triangular quantum dots withinside the presence of magnetic field

2024-10 , Emre Bahadir AL , Norshamsuri Ali @ Hasim , Rosdisham Endut , Syed Alwee Aljunid Syed Junid , Norshah Rizal Ali , Nor Roshidah Yusof

Linear and third‐order nonlinear optical absorption coefficients and relative refractive index changes in symmetric and asymmetric double triangular quantum dots are examined theoretically. The dependence of these optical properties on the magnetic field is examined. After calculating energies and wave functions within the effective mass and parabolic band approaches, analytical expressions of linear and nonlinear optical properties are obtained using the compact density matrix approach and iterative method. Numerical calculations are presented for typical GaAs/AlGaAs material. The results show that the magnetic field causes different effects on the and transitions. Moreover, the calculated results also reveal that the resonance frequency and nonlinear contribution are different in symmetric and asymmetric structures. As a result, it is concluded that the magnetic field plays a vital and important role in the electronic and optical properties of the system and can be used to tune the inter‐subband transitions and change the corresponding optical sensitivities.

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Donor impurity related linear and nonlinear optical properties of symmetric and asymmetric double triangular quantum dots

2025 , Emre Bahadir Al , Norshamsuri Ali @ Hasim , Rosdisham Endut , Syed Alwee Aljunid Syed Junid , Nor Roshidah Yusof

Linear and third-order nonlinear optical absorption coefficients and relative refractive index changes in symmetric and asymmetric double triangular quantum dots are explored theoretically. The dependence of these optical properties on the presence and position of the impurity is explored. After the computation of energies and wave functions in the framework of the effective mass and parabolic band approaches, analytical formulas for linear and nonlinear optical properties are obtained using the compact density matrix technique and the iterative method. Numerical computations for a typical GaAs/AlGaAs material are presented. The results demonstrate that the donor binding energy substantially depends on the position of the impurity and the geometry of the quantum dot and the presence and position of the donor atom has various impacts on the π and σ± transitions. In addition, the estimated findings clearly reveal that the resonant frequency and the nonlinear contribution to the optical characteristics are different in symmetric and asymmetric systems. It can be inferred that the hydrogenic donor impurity plays a crucial and important function in the electrical and optical properties of the system and can be used to modify the inter-subband transitions and change the corresponding optical sensitivities.

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