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单芯帽纳米颗粒的光学性质

Optical Properties of Single Core-Capped Nanoparticles

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摘要

基于三维时域有限差分法,计算了非球对称单芯帽纳米颗粒在不同结构参数作用下的局域表面等离子体共振(LSPR)响应。采用模板法和真空蒸镀技术制备了SiO2@Au芯帽结构纳米颗粒,通过透射电子显微镜和紫外可见近红外分光光度计对其形貌和光学性质进行了测量分析,获得了金壳厚度、芯壳比、芯径和金属表面覆盖率等纳米结构参数对LSPR峰值吸收波长和吸收截面的影响规律。结果表明,芯帽纳米颗粒结构参数的微小改变会导致LSPR峰在可见光到近红外波段的宽带红移。

Abstract

The localized surface plasmon resonance (LSPR) response of single core-capped non-spherically-symmetric nanoparticles with different structural parameters is calculated based on the three-dimensional finite-difference time-domain method. The SiO2@Au core-capped nanoparticles are prepared by the template method and the vacuum evaporation technique. The surface morphologies and optical properties are measured and analyzed by the transmission electron microscopy and the UV-visible near-infrared spectrophotometer. The effects of structural parameters such as metal shell thickness, core-shell ratio, core diameter and metal surface coverage on the LSPR peak absorption wavelength and absorption cross section are obtained. The results indicate that a small change of the structural parameters of core-capped nanoparticles results in a broadband red shift of the LSPR peak in the visible to near infrared spectral range.

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中图分类号:O436.2

DOI:10.3788/aos201838.0524001

所属栏目:表面光学

基金项目:国家自然科学基金(31271064)

收稿日期:2017-11-03

修改稿日期:2017-12-13

网络出版日期:--

作者单位    点击查看

洪昕:大连理工大学电子信息与电气工程学部生物医学工程系, 辽宁 大连 116024
王晨晨:大连理工大学电子信息与电气工程学部生物医学工程系, 辽宁 大连 116024

联系人作者:洪昕(hongxin@dlut.edu.cn)

备注:洪昕(1970-),女,博士,教授,主要从事生物纳米光学与显微成像以及生物传感技术方面的研究。E-mail: hongxin@dlut.edu.cn

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引用该论文

Hong Xin,Wang Chenchen. Optical Properties of Single Core-Capped Nanoparticles[J]. Acta Optica Sinica, 2018, 38(5): 0524001

洪昕,王晨晨. 单芯帽纳米颗粒的光学性质[J]. 光学学报, 2018, 38(5): 0524001

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