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 × 108 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.
© 2005 Optical Society of America
Original Manuscript: April 9, 2004
Revised Manuscript: February 14, 2005
Manuscript Accepted: February 17, 2005
Published: July 1, 2005
Fajian Zhang, Liangmin Zhang, You-Xiong Wang, and Richard Claus, "Enhanced absorption and electro-optic Pockels effect of electrostatically self-assembled CdSe quantum dots," Appl. Opt. 44, 3969-3976 (2005)