کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
9786132 1512666 2005 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Third-order non-linear spectroscopy of CdSe and CdSe/ZnS core shell quantum dots
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد مواد الکترونیکی، نوری و مغناطیسی
پیش نمایش صفحه اول مقاله
Third-order non-linear spectroscopy of CdSe and CdSe/ZnS core shell quantum dots
چکیده انگلیسی
The third-order non-linear optical properties of CdSe and CdSe/ZnS core-shell quantum dots in solution with toluene were studied over a spectrum ranging from 450 to 680 nm using 225-fs pulses. The electronic and thermal contributions to the non-linearity, leading to positive or negative non-linear refractive indices, are investigated. Although the sign and magnitude of the non-linearity vary with wavelength, it was found to be of the same order of magnitude as that of bulk CdSe for the same photon energy-to-band gap ratio. However, because the absorption edge of CdSe quantum dots is blue-shifted relative to bulk, it permits fast optoelectronic applications in the visible spectrum by avoiding slow thermal effects normally associated with linear absorption.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Optics Communications - Volume 246, Issues 1–3, 1 February 2005, Pages 205-212
نویسندگان
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