| 等离激元结构在不同参量下捕获粒子的性能研究 |
| 投稿时间：2024-12-02 修订日期：2024-12-11 点此下载全文 |
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| 基金项目:国防科技创新特区(02-ZT-008) |
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| 中文摘要:本文研究了双纳米孔（Double Nanohole，DNH）结构在不同激光功率下对纳米粒子捕获性能的影响，并分析了粒子的捕获回归特性。通过时域有限差分（Finite-Difference Time-Domain，FDTD）方法对DNH结构进行仿真，结果表明，在852 nm的入射波长下，结构的透射特性达到峰值，激发出较强的等离激元效应，从而使局域电场分布增强达到100倍以上。采用聚焦离子束技术制备了DNH结构，并在不同激光功率下对20 nm金粒子进行捕获。实验结果表明，粒子捕获的电压跳变信号差值与激光功率呈正相关，并找到最稳定的粒子捕获状态，灵敏度达到10-19 J。此外，通过对20 nm金粒子进行粒子回归特性分析，验证了DNH结构的高效捕获效率。综合仿真和实验结果，本研究为设计高效且低热损伤的光镊系统提供了理论和实验依据。 |
| 中文关键词:等离激元效应，双纳米孔，粒子捕获 |
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| Study of Nanoparticle Capture Performance in Plasmonic Structures under Varying Parameters |
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| Abstract:This study investigates the effect of laser power on the nanoparticle capture performance of the double nanohole (DNH) structure and analyzes the particle capture and rebound characteristics. The DNH structure was simulated using the Finite-Difference Time-Domain (FDTD) method, and the results show that at an incident wavelength of 852 nm, the structure exhibits peak transmission characteristics, exciting strong plasmonic effects that enhance the local electric field by over 100 times. The DNH structure was fabricated using Focused Ion Beam (FIB) technology, and the capture of 20 nm gold nanoparticles was studied under varying laser power. Experimental with the most stable particle capture state found at a sensitivity of 10?1? J. Additionally, particle rebound characteristics were analyzed to verify the high capture efficiency of the DNH structure for 20 nm gold particles. Combining both simulation and experimental results, this study provides theoretical and experimental insights for the design of efficient, low-thermal-damage optical tweezers systems. |
| keywords:Plasmonic effect, DNH, Particle capture. |
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