The Second Order Nonlinear Susceptibility of Quantum Confined Semiconductors鈥擜 Single Dot Study

详细信息    查看全文

• 作者：Shoshana Winter ; Marcin Zielinski ; Dominique Chauvat ; Joseph Zyss ; Dan Oron
• 刊名：Journal of Physical Chemistry C
• 出版年：2011
• 出版时间：March 24, 2011
• 年：2011
• 卷：115
• 期：11
• 页码：4558-4563
• 全文大小：810K
• 年卷期：v.115,no.11(March 24, 2011)
• ISSN：1932-7455

文摘

Detection of the second harmonic generation from single CdTe quantum dots of 11.5 nm diameter enables us to obtain an absolute value for the nonlinear susceptibility 蠂⁽²⁾ of these nanoparticles as well as their dispersion properties. These measurements, complemented by ensemble hyper-Rayleigh scattering characterization, elucidate the role of quantum confinement in the second harmonic generation process. We show that, under similar excitation conditions, the 蠂⁽²⁾ of quantum dots can significantly exceed that of the corresponding bulk material. The results indicate that by careful choice of excitation wavelength and material, kilo-counts per second rates of second harmonic generation photons can be obtained from quantum dots with <10 nm diameters, making second harmonic scattering quantum dots a promising option for use as biolabels.