کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5352377 1388149 2013 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Tuning the plasmon shift and local electric field distribution of gold nanodumbbell: The effect of surface curvature transition from positive to negative
ترجمه فارسی عنوان
تنظیم تغییر پلاسمون و توزیع الکتریکی میدان الکتریکی نانولوله های طلای طلایی: اثر گذار از انحنای سطح از مثبت تا منفی
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی تئوریک و عملی
چکیده انگلیسی
The localized surface plasmon resonance (LSPR) properties and local electric field distributions of the gold nanodumbbell are theoretically studied by using the finite-difference time-domain (FDTD) calculation. The decrease of both positive curvature radius in the spherical end and the negative curvature radius in the midsection results in the absorption peak corresponding to longitudinal plasmon mode red shifts distinctly. However, the transverse plasmonic absorption peak is not sensitive to the change of the curvature radii. The physical mechanism has been illuminated by studying the shape transformation dependent local field distribution between nanorod and nanodimer. It has been found that the decrease of the radii of curvature leads to the dumbbell-shaped particle transforming to a dimer-like structure, while the change in inter-particle plasmon coupling results in the “hot spots” of the local field migrating from the spherical ends to the midsection of the particle. There is an associated red shift of longitudinal LSPR. These results indicate that the transition of surface curvature between positive and negative greatly affects the surface charge distribution, local field enhancement and plasmon coupling.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Applied Surface Science - Volume 285, Part B, 15 November 2013, Pages 649-656
نویسندگان
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