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采用电调制技术在室温下测量了 Cd S0 .1 Se0 .9纳米晶体的电吸收谱 ,并对电吸收谱线形进行了分析。纳米晶体与第一个吸收峰有关的电吸收谱结构具有吸收系数对能量的二阶微商特征 ,表明第一激发态在电场作用下以吸收谱线的宽化为主 ,而纳米晶体尺寸不单一是吸收谱线宽化的主要因素。共振电光响应信号的峰值位置、过零点位置以及电吸收谱的线形几乎不随外电场强度而变化 ,信号幅度随外电场强度的平方线性增加。 Cd S0 .1 Se0 .9纳米晶体的电光效应是Kerr效应 ,纳米晶体具有三阶非线性光学极化率 Χ( 3 )。
The electrosorption spectra of CdS0.1Se0.9 nanocrystals were measured by electric modulation at room temperature. The electrosorption spectra were also analyzed. The absorption spectra of the nanocrystals with the first absorption peak have the second-order derivative of the absorption coefficient to the energy, indicating that the first excited state is dominated by the broadening of the absorption line under the action of the electric field, whereas the nanocrystal size is not Single is the main factor to broaden the absorption spectrum. The peak position, zero-crossing position and the shape of the absorption spectrum of the resonant electro-optic response signal hardly change with the external electric field intensity, and the signal amplitude increases linearly with the square of the external electric field intensity. The electro-optic effect of CdS0.1Se0.9 nanocrystals is Kerr effect, and the nanocrystal has third-order nonlinear optical polarizability X (3).