构建多模式全光谱暗场显微镜用于纳米单颗粒局域表面等离子共振实时动力学研究

doi:10.3866/PKU.WHXB201805022

物理化学学报 >> 2019, Vol. 35 >> Issue (4): 371-377.doi: 10.3866/PKU.WHXB201805022

构建多模式全光谱暗场显微镜用于纳米单颗粒局域表面等离子共振实时动力学研究

刘磊^1,²,郝亚亚¹,邓素辉¹,王坤¹,李江¹,王丽华¹,樊春海¹,李嘉隽^1,*(),柳华杰^1,*()

¹ 中国科学院上海应用物理研究所，上海 201800
² 中国科学院大学，北京 100049

收稿日期:2018-03-12 发布日期:2018-09-13
通讯作者: 李嘉隽,柳华杰 E-mail:jiajunli@sinap.ac.cn;liuhuajie@sinap.ac.cn
基金资助:
国家自然科学基金项目(21775157);国家自然科学基金项目(21722310);国家自然科学基金项目(U1532119);国家自然科学基金项目(61378062);国家自然科学基金项目(61665006);中国科学院科研装备研制项目资助

Multi-Mode Full Spectrum Dark Field Microscope for Single Nanoparticle Localized Surface Plasmon Resonance Dynamics Study

Lei LIU^1,²,Yaya HAO¹,Suhui DENG¹,Kun WANG¹,Jiang LI¹,Lihua WANG¹,Chunhai FAN¹,Jiajun LI^1,*(),Huajie LIU^1,*()

¹ Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, P. R. China
² University of Chinese Academy of Sciences, Beijing 100049, P. R. China

Received:2018-03-12 Published:2018-09-13
Contact: Jiajun LI,Huajie LIU E-mail:jiajunli@sinap.ac.cn;liuhuajie@sinap.ac.cn
Supported by:
the National Natural Science Foundation of China(21775157);the National Natural Science Foundation of China(21722310);the National Natural Science Foundation of China(U1532119);the National Natural Science Foundation of China(61378062);the National Natural Science Foundation of China(61665006);the Instrument Developing Project of the Chinese Academy of Sciences

摘要/Abstract

摘要：

金属纳米颗粒由于其局域表面等离子共振(LSPR)，能显示出独特的光吸收和散射特性，常被应用于物理、化学和生物领域的分析检测。这类探针具有高强度、高稳定性，以及可以长时间成像观察等优势。对于单个金属纳米颗粒的LSPR光谱研究通常采用暗场显微镜(DFM)与光谱仪来观察。但是，现有的暗场显微镜-光谱仪联用装置受限于自带照明光源的强度与光谱范围等原因，造成对散射信号较弱的样品光谱采集时间长、采集范围窄，例如，无法做到对粒径在30 nm以下的小颗粒纳米金进行实时观察。本文针对这一问题使用超连续激光器作为光源，使对单个金属纳米颗粒的光谱采集时间可以缩短至1 ms。此外，针对细胞功能成像的需求，增加了光片成像模式，通过切换滤块，能够实现荧光成像与暗场成像的共定位。

关键词: 暗场显微镜, 宽场显微镜, 聚焦激光暗场显微镜, 纳米探针, 快速光谱分析

Abstract:

In the last few decades, noble metal nanoparticles (MNP) have been widely used as imaging probes, in the field of bio-imaging, due to their localized surface plasmon resonance (LSPR) phenomenon. Compared to fluorescent probes, MNP imaging exhibits high sensitivity and outstanding signal-to-noise ratio, while the particle itself has good photostability; this makes the MNP probe the perfect candidate for long-term imaging. Currently the most popular MNP imaging and analysis method employs a dark-field microscope with a spectroscope. Since most dark-field microscopes use halogen lamp or mercury lamp as their illumination source, the illumination intensity and wavelength spectrum are limited. Both camera and spectroscopy require longer exposure time to collect sufficient scattering signal to generate a reasonable quality image and scattering spectrum. The narrow illumination spectrum also limits the size of the MNP that can be used (larger-diameter MNP tend to scatter in the near-infrared region). Therefore, a high-intensity and wide-spectrum illumination source is urgently needed in MNP imaging. In this study, we custom-designed a multi-mode dark field microscope by using a supercontinuum laser, comprising of a lightsheet illumination mode for wide-field imaging and a back focus mode for live spectrum analysis, as its illumination source. The total output of the supercontinuum laser was 2 W. Since it was a coherent illumination source it could be focused by the microscope objective to a near diffraction limit area for sufficient intensity. Moreover, since its wavelength spectrum was between 450 nm and 2200 nm, which covered most of the visible and near infrared region, it made the detection of the large-diameter MNP single particle possible. In the back-focus mode, the supercontinuum laser first passed through an annular filter and then entered the objective from the microscope back port. In the lightsheet illumination mode, the laser was focused by a 400-mm cylindrical concave mirror to create a "sheet" and illuminate the sample from its side. In both the illumination modes, the illumination radiation was blocked from the camera to obtain the dark field illumination effect. By using a multi-mode dark field microscope, we could observe a 30-nm-diameter MNP single particle with a color CCD camera in its lightsheet illumination mode and a spectrum time resolution of 1 ms in its back-focus illumination mode. This custom-designed microscope could not only be used to study the MNP single particle in living cells, but more importantly, its application could also be potentially extended to all the MNP-probe-based cell imaging.

Key words: Dark field spectroscopy, Wide field spectroscopy, Focus laser dark field spectroscopy, Nano probe, Rapid spectrum analysis

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刘磊, 郝亚亚, 邓素辉, 王坤, 李江, 王丽华, 樊春海, 李嘉隽, 柳华杰. 构建多模式全光谱暗场显微镜用于纳米单颗粒局域表面等离子共振实时动力学研究[J]. 物理化学学报, 2019, 35(4): 371-377.

Lei LIU, Yaya HAO, Suhui DENG, Kun WANG, Jiang LI, Lihua WANG, Chunhai FAN, Jiajun LI, Huajie LIU. Multi-Mode Full Spectrum Dark Field Microscope for Single Nanoparticle Localized Surface Plasmon Resonance Dynamics Study[J]. Acta Physico-Chimica Sinica, 2019, 35(4): 371-377.

链接本文: https://www.whxb.pku.edu.cn/CN/10.3866/PKU.WHXB201805022

https://www.whxb.pku.edu.cn/CN/Y2019/V35/I4/371

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构建多模式全光谱暗场显微镜用于纳米单颗粒局域表面等离子共振实时动力学研究

Multi-Mode Full Spectrum Dark Field Microscope for Single Nanoparticle Localized Surface Plasmon Resonance Dynamics Study

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