Within the quasi-one-dimensional effective potential model and effective mass approximation,we obtain the wavefunctions and energy eigenvalues of the ground（j=1） and first 2 excited states（j=2 and 3） of a donor im...Within the quasi-one-dimensional effective potential model and effective mass approximation,we obtain the wavefunctions and energy eigenvalues of the ground（j=1） and first 2 excited states（j=2 and 3） of a donor impurity in a rectangular GaAs quantum dot in the presence of electric field.The donor impurity-related linear and nonlinear optical absorption as well as refractive index changes for the transitions j=1-2 and j =2-3 are investigated.The results show that the impurity position,incident optical intensity and electric field play important roles in the optical absorption coefficients and refractive index changes.We find that the impurity effect induces the blueshift for j=1-2 and redshift for j=3-2 in the absence of the electric field,but it leads to redshift for j = 1-2 and blueshift for j = 3-2 in the existence of the field.Also,the optical coefficient for the higher energy transitions j =2-3 is insensitive to variation of impurity positions,while that for the low energy transition j =1-2 depends significantly on the positions of impurity.In addition,the saturation and splitting phenomenon of the optical absorption are observed as the incident optical intensity increases.展开更多
The original mathematical treatment used in the analysis of the Fizeau experiment of 1851, which measured the relative speed of light in a moving medium, assumes that light travels through the water in a smooth contin...The original mathematical treatment used in the analysis of the Fizeau experiment of 1851, which measured the relative speed of light in a moving medium, assumes that light travels through the water in a smooth continuous flow, at a speed less than the speed of light in a vacuum (relative to the water). Thus, it assumes that the water’s velocity vector can simply be added to that of the light. However, light is transmitted through optical media, such as water, by a continuous process of charge excitation (semi-absorption) and re-emission by the water molecules;but travels between them at the full speed of light (in a vacuum). Thus, the mathematics describing the process of Fresnel dragging must be formulated differently and can then be explained by classical physics, allowing the entire process to be fully visualized.展开更多
基金Project supported by the Science and Technology Project of Education Department of Heilongjiang Province of China(No.12541070)
文摘Within the quasi-one-dimensional effective potential model and effective mass approximation,we obtain the wavefunctions and energy eigenvalues of the ground（j=1） and first 2 excited states（j=2 and 3） of a donor impurity in a rectangular GaAs quantum dot in the presence of electric field.The donor impurity-related linear and nonlinear optical absorption as well as refractive index changes for the transitions j=1-2 and j =2-3 are investigated.The results show that the impurity position,incident optical intensity and electric field play important roles in the optical absorption coefficients and refractive index changes.We find that the impurity effect induces the blueshift for j=1-2 and redshift for j=3-2 in the absence of the electric field,but it leads to redshift for j = 1-2 and blueshift for j = 3-2 in the existence of the field.Also,the optical coefficient for the higher energy transitions j =2-3 is insensitive to variation of impurity positions,while that for the low energy transition j =1-2 depends significantly on the positions of impurity.In addition,the saturation and splitting phenomenon of the optical absorption are observed as the incident optical intensity increases.
文摘The original mathematical treatment used in the analysis of the Fizeau experiment of 1851, which measured the relative speed of light in a moving medium, assumes that light travels through the water in a smooth continuous flow, at a speed less than the speed of light in a vacuum (relative to the water). Thus, it assumes that the water’s velocity vector can simply be added to that of the light. However, light is transmitted through optical media, such as water, by a continuous process of charge excitation (semi-absorption) and re-emission by the water molecules;but travels between them at the full speed of light (in a vacuum). Thus, the mathematics describing the process of Fresnel dragging must be formulated differently and can then be explained by classical physics, allowing the entire process to be fully visualized.
