Enhanced absorption and electro-optic Pockels effect of electrostatically self-assembled CdSe quantum dots |
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Authors: | Zhang Fajian Zhang Liangmin Wang You-Xiong Claus Richard |
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Affiliation: | Fiber & Electro-Optics Research Center, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061, USA. roclaus@vt.edu |
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Abstract: | The spectrum and electro-optic properties of CdSe quantum dots are studied. Spectrum wavelength shifts that are due to the quantum size effect and to the electro-optic Stark effect are investigated. It is found that CdSe quantum dot-polymer composites formed by an electrostatic self-assembly (ESA) technique exhibit high internal electric fields. Using the second-order perturbation theory of the 1s-1s energy shift (Stark effect), we estimate the internal field of the ESA film to be as high as 2.6 x 10(8) V/m. This value results in a much higher absorption coefficient and electro-optic coefficients for ESA films than for their bulk crystal counterparts or for spin-coated film samples. The relationships among unusual spectra, film structure, and high electro-optic response are analyzed. These results are useful both for understanding the physical mechanisms of semiconductor quantum dots and for developing high-performance photonic devices. |
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