Optical Near Field Study of Ag Nanowires by the Differential Method

• 作者: Ahmed Taalbi Aziz Zenati Ghaouti Bassou Hanifi Bendaoud Laurent Salomon Mohamed Zoheir Chekroun Mohammed Ameri
• 来源期刊: 现代物理(英文)
• 学科: 医学
• 关键词: NEAR-FIELD DIFFERENTIAL METHOD NANOWIRES PLASMONS SILVER
• 年，卷（期）: 2012,（1）
• 页码范围: 102-109
• 页数: 8页
• 分类号: R73

摘要

The optical response of subwavelength silver nanowires arranged periodically on silica has been analyzed numerically by the differential method improved by the S matrix algorithm. Our results improve the capacity of this rigorous method to give a description of various phenomena occurring in near and far field around the periodic grating. This renders pos- sible to determine the positions of plasmon’s resonance according to the choice of materials used and the geometrical properties. We study the behavior of the diffracted light by the nano-structure in both single nanowire case and grating nanowires case. The influence of the exact grating period and the induced modification of the spacer nanowire depend- ence are then discussed. Moreover, we present mappings of the electromagnetic field located at 50 nm above the nanowires.