CAJ | 학술논문

利用量子力学中的紧致密度矩阵方法,研究了施加电场的半抛物量子阱中的二阶非线性光学极化率(光整流系数),得到了此系统的光整流系数的解析表达式.数值计算的结果表明,随着电场强度的增加,光整流系数几乎线性随之增加,而且在同样的电场强度及抛物束缚势频率作用下,半抛物量子阱模型中的光整流系数比抛物量子阱模型中的值大一个数量级,这是由于我们所选模型本身的非对称性以及电场进一步使这种非对称性增强的缘故.
이용양자역학중적긴치밀도구진방법,연구료시가전장적반포물양자정중적이계비선성광학겁화솔(광정류계수),득도료차계통적광정류계수적해석표체식.수치계산적결과표명,수착전장강도적증가,광정류계수궤호선성수지증가,이차재동양적전장강도급포물속박세빈솔작용하,반포물양자정모형중적광정류계수비포물양자정모형중적치대일개수량급,저시유우아문소선모형본신적비대칭성이급전장진일보사저충비대칭성증강적연고.
By using the compact density matrix method, the second-order nonlinear optical susceptibility (optical rectification, OR) in a semi-parabolic quantum well (QW) with an applied electric field has been theoretically investigated. Numerical results reveal that OR coefficient in the model nearly linearly increases with the increase of magnitude of the electric field, and the coefficient is 10 times larger than that in the parabolic QW under the same electric field and frequency of parabolic confining potential, which is due to the asymmetry of the system and the electric field effect.