| 等离激元结构在不同参量下的粒子捕获性能研究 |
| 投稿时间：2024-12-02 修订日期：2024-12-11 点此下载全文 |
| 引用本文：董程涛,武京治,安玉,王艳红.等离激元结构在不同参量下的粒子捕获性能研究[J].红外,2025,46(4):42~48 |
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| 基金项目:国防科技创新特区项目(02-ZT-008) |
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| 中文摘要: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结构进行了仿真。结果表明，在852 nm的入射波长下，该结构的透射特性达到峰值，激发出较强的等离激元效应，使局域电场分布增强150倍左右。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，且入射功率为6 mW时粒子的捕获状态最稳定。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 on Particle Capture Performance of Plasmonic Structures Under Different Parameters |
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| Abstract:The effect of the double nanohole (DNH) structure on the nanoparticle capture performance under different laser powers is studied, and the capture and rebound characteristics of the particles are analyzed. The DNH structure is simulated by the finite-difference time-domain (FDTD) method. The results show that at an incident wavelength of 852 nm, the transmission characteristics of the structure reach a peak, stimulating strong plasmonic effects, which enhanced the local electric field distribution by about 150 times. The DNH structure is prepared by focused ion beam technology, and 20 nm gold particles are captured under different laser powers. The experimental results demonstrate a positive correlation between the voltage jump signal difference (indicative of particle trapping) and laser power, with the most stable trapping state achieved at 6 mW incident power. In addition, the high capture efficiency of the DNH structure is verified by analyzing the particle rebound characteristics of 20 nm gold particles. Combining the simulation and experimental results, this study provides a theoretical and experimental basis for the design of efficient and low-thermal-damage optical tweezers systems. |
| keywords:plasmonic effect double nanohole particle capture |
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