CN111122517A - 一种基于非对称纳米粒子二聚体微纳结构传感器 - Google Patents
一种基于非对称纳米粒子二聚体微纳结构传感器 Download PDFInfo
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Abstract
一种基于非对称纳米粒子二聚体微纳结构传感器，涉及一种二聚体微纳结构传感器，基于非对称纳米粒子二聚体结构中的表面等离激元特性，激发了具有法诺线型的共振吸收光谱。该共振源于连续的表面模式和分立的局域模式。其反射光谱峰值对外部环境异常敏感，同时峰值半高宽狭窄便于在工程探测中便于观察其，灵敏度可以达到667nm/RIU。该方法适用于各种待评的水环境情况，同时该方法结构合理并且概念清楚，灵活简便，可以进行推广。
Description
技术领域
本发明涉及一种二聚体微纳结构传感器，特别是涉及一种基于非对称纳米粒子二聚体微纳结构传感器。
背景技术
随着微纳结构加工技术的发展,金属微纳结构特有的表面等离激元特性表现出极大的应用价值。当入射光的波长与金属纳米结构相匹配时,就会发生表面等离激元共振现象。基于表面等离子体共振的金属纳米结构传感器具有测量精度高、易集成的特点，类似光子器件已经被广泛应用于光开关、滤波器、生化传感等领域，与法诺共振相关的结构可调性、传感特性等也表现出很大的应用潜力。法诺共振能够降低能量损耗,得到较高的电场,然而由于表面等离激元共振在可见光波段具有较大的辐射损耗,导致等离子体共振传感器谐振峰较宽,极大地限制了传感器的性能。
发明内容
本发明的目的在于提供一种基于非对称纳米粒子二聚体微纳结构传感器，本发明基于一种独特的微纳复合结构，同时实现了表面等离激元和局域表面等离激元两种共振模式，并且利用两种模式的耦合效应激发了法诺共振吸收光谱线型，法诺共振效应是一种弱耦合作用,其对周围介质的变化异常敏感,利用表面等离激元耦合结构实现法诺共振效应设计了本发明高灵敏传感器。
本发明的目的是通过以下技术方案实现的：
一种基于非对称纳米粒子二聚体微纳结构传感器，所述非对称纳米粒子二聚体结构传感器，包括银纳米粒子二聚体以及银薄膜，每个周期单元由竖直放置的两个非对称纳米粒子组成；该微纳结构置于不同水环境中反射光谱出现消光现象。
所述的一种基于非对称纳米粒子二聚体微纳结构传感器，所述微纳结构中所组成部分均采用金属银。
所述的一种基于非对称纳米粒子二聚体微纳结构传感器，所述传感器晶格周期630 nm，银薄膜厚度40 nm，上层纳米粒子和下层纳米粒子半径分别为150 nm和90 nm 。
本发明的非对称结构的纳米粒子二聚体微纳结构传感器具有如下特点：
1、通过两个非对称结构的纳米粒子二聚体可激发局域等离激元，包括电偶极和电四极模式，即分立模式；
2、通过银薄膜结构激发表面等离激元，即连续模式；
3、通过分立模式和连续模式的吸收光谱相干叠加形成了反对称线型的法诺共振吸收；
4、本发明的吸收峰值点发生在可见光波段；
5、本发明的反射谷值具有窄带特性，在进行水环境折射率检测时具有很好的探测性；
6、本发明纳米传感精度可达到667nm/RIU，可探测外部水环境的细微变化。
附图说明
图1 是本发明提出的非对称纳米粒子二聚体传感器示意图；
图2 是实施例的反射光谱随折射率变化的仿真结果。
具体实施方式
下面结合实施例对本发明的技术方案作进一步说明，以下对在附图中提供的本申请的实施例的详细描述并非旨在限制要求保护的本申请的范围，而是仅仅表示本申请的选定实施例。凡是对本发明技术方案进行修改或者等同替换，而不脱离本发明技术方案的精神和范围，都属于本申请保护的范围。
本发明一种基于非对称纳米粒子二聚体微纳结构传感器，纳米粒子二聚体由于结构的不对称性，激发了电偶极和电四极局域等离激元，置于金属薄层上同时激发表面等离激元，利用表面模式和局域模式相干叠加实现了法诺共振吸收反对称线型。非对称纳米粒子二聚体的半径分别为90 nm和150 nm，基底金属膜厚度40 nm。激发光分别为687 nm和632nm时分别激发了局域等离激元的电偶极和电四极模式。连续的表面模式和分立的局域等离激元模式相干叠加后形成反对称的法诺共振吸收线型。法诺线型的反射光谱的峰值点对其处于的外部水环境敏感，反射效率均可达到~0.1，有利于提高在检测过程中探测信号灵敏度。
实验上已经制备出竖直放置的纳米粒子二聚体阵列微纳结构，非对称银纳米粒子二聚体结构在不同的激发波长下会出现多极局域共振吸收峰，分别是电偶极和电四极模式。放置于银薄膜上会激发相应波长下的表面等离激元。局域的分立模式和表面的连续模式会在合适频率下形成法诺共振。
实施例
如图1所示，本实施例选用非对称银纳米粒子二聚体，周期阵列单元由两个非对称银纳米粒子竖直放置，周期结构置于基底为石英的薄银薄膜上，入射光垂直照射在银膜表面上。 上层纳米粒子半径150 nm，下层纳米粒子半径90 nm，晶格常数630 nm，银膜厚度为40 nm。
图2是该传感器在不同折射率环境下的反射光谱谷值点，其中
灵敏度=定义为反射谷值对应波长变化率/折射率变化率。
法诺共振对外部环境折射率非常敏感，当外部环境折射率变化范围1.0-2.0，法诺共振反射峰随着折射率的增大发生红移。逐渐尖锐的反对称线型说明了等离激元传感器敏感性的提高。
图2同时可以说明法诺共振波长与折射率的依赖关系。反射点都拥有很高的反射效率（~0.1），这说明非对称二聚体微纳结构传感器不仅具有很高的灵敏度（667 nm/RIU），同时伴随着对应波长的共振吸收。
Claims (3)
1.一种基于非对称纳米粒子二聚体微纳结构传感器，其特征在于，所述非对称纳米粒子二聚体结构传感器，包括银纳米粒子二聚体以及银薄膜，每个周期单元由竖直放置的两个非对称纳米粒子组成；该微纳结构置于不同水环境中反射光谱出现消光现象。
2.根据权利要求1所述的一种基于非对称纳米粒子二聚体微纳结构传感器，其特征在于，所述微纳结构中所组成部分均采用金属银。
3.根据权利要求1所述的一种基于非对称纳米粒子二聚体微纳结构传感器，其特征在于，所述传感器晶格周期630 nm，银薄膜厚度40 nm，上层纳米粒子和下层纳米粒子半径分别为150 nm和90 nm 。
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| US20220169860A1 (en) * | 2020-11-30 | 2022-06-02 | Palo Alto Research Center Incorporated | Particles with color effect and compositions including the same |
| CN115453433A (zh) * | 2022-11-09 | 2022-12-09 | 南方电网数字电网研究院有限公司 | 石墨烯非对称结构磁传感器及其参数确定方法 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112366236A (zh) * | 2020-11-18 | 2021-02-12 | 沈阳大学 | 光能量收集微结构、感光元件和光学器件 |
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| CN115453433A (zh) * | 2022-11-09 | 2022-12-09 | 南方电网数字电网研究院有限公司 | 石墨烯非对称结构磁传感器及其参数确定方法 |
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