“…Especially with the rapid advances in nanofabrication techniques such as molecular beam epitaxy and metal-organic chemical vapor deposition and their several variants such as chemical beam epitaxy and atomic layer epitaxy, it is possible to produce a variety of nano materials such as quantum wells, quantum wires, and quantum dots by controlling size, shape,chemical environment and composition, which further advances research on optical and electronic properties in nano materials. In the past few years linear and nonlinear optical properties associated with electronic transitions in nano materials such as quantum wells, quantum wires and quantum dots have been intensively investigated [1][2][3][4][5][6][7][8][9][10]. These properties have become the important physical foundation for many optoelectronic devices such as high-speed electro-optical modulators, far infrared photodetectors, semiconductor optical amplifiers [11][12][13].…”