Biophotonics: Towards Nondestructive Optical Analysis of Nanostructures Using Photonic Nanojets

生物光子学：利用光子纳米喷射对纳米结构进行无损光学分析

• 批准号: 0522639
• 负责人: Vadim Backman
• 金额: $ 19.94万
• 依托单位: Northwestern University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2005
• 资助国家: 美国
• 起止时间: 2005-07-01 至 2008-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0522639&HistoricalAwards=false
• 关键词: Biophotonics; Towards; Nondestructive; Optical; Analysis

Backman0522639This proposal seeks to experimentally demonstrate and characterize photonic nanojets. Nanojets are created through the local field enhancement of micro-spheres or micro-cylinders and greatly enhance the backscattering of small nanoparticles that are located within their extent. Rigorous FDTD calculations by the investigators have shown that the intensity and angular distribution of backscattered nanoparticles in the nanojets are highly dependent upon the particle size. A unique feature of the nanojets lies in the fact that they are neither diffracting nor evanescent. The investigators propose to use the nanojets as a new sorting method for nanoshells in order to obtain a uniform size distribution to obtain better spectral selectivity in imaging applications. Applications of the nanojets to sorting intracellular macromolecules are also proposed.

Backman0522639该提案旨在通过实验证明和表征光子纳米喷射。纳米喷射是通过微球体或微圆柱体的局部场增强而产生的，并且极大地增强了位于其范围内的小纳米颗粒的反向散射。研究人员进行的严格时域有限差分 (FDTD) 计算表明，纳米喷射中反向散射纳米颗粒的强度和角度分布高度依赖于颗粒尺寸。纳米喷射的一个独特之处在于它们既不衍射也不消失。研究人员建议使用纳米喷射作为纳米壳的新分选方法，以获得均匀的尺寸分布，从而在成像应用中获得更好的光谱选择性。还提出了纳米喷射在细胞内大分子分选中的应用。