Effects of External Electric and Magn etic Fields on the Linear and Non linear Op tical Pro perties in a Quantu m Pseudodot

Small solid state devices, such as quantum dots (Q Ds), can c onfine a few electrons in all spatial dimensions. The thre e-dimensional nanoscal e confineme nt of the electrons makes it possible to obse rve quantu m size effects on elec tronic and optical pr operties in these struct ures. Becau se of their importance i n the optic al propertie s, quantum dots have gained significant attenti on. One of t he most interesting properties of the quantum d ots is the possible occurrence of the intersubbands optical t ransitions. T he dipole m atrix elements of the optical transition betwee n the subba nds of the q uantum dots have significantly large value. A very large dipole mat rix element and small energy sep aration between subbands dramatically enhance the cont ribution of nonlinear parts of the dielectric constant and other optical prope rties. Thus, a great deal of works has been perf ormed on the linear and nonlinear optical absorp tion coeffic ient and index of the refraction of semiconductor nanostructures such as quant um dots [۱-۴].

کلیدواژه ها:

Quan tum Pseudo dot ، Optical Properties ، Electric and Magnetic Fields.