Active tuning of Mie resonances to realize sensitive photothermal measurement of single nanoparticles,Materials Horizons

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Active tuning of Mie resonances to realize sensitive photothermal measurement of single nanoparticles
Materials Horizons ( IF 12.2 ) Pub Date : 2020-03-26 , DOI: 10.1039/d0mh00311e
Jiahao Yan _{1,

2,

3,

4} , Yuchao Li _{1,

2,

3,

4} , Zaizhu Lou _{1,

2,

3,

4} , Churong Ma _{5,

6,

7,

8,

9} , Guowei Yang _{5,

6,

7,

8,

9} , Baojun Li _{1,

2,

3,

4}

Affiliation

High-index all-dielectric nanostructures with Mie-type resonances have promising applications in building optical nanodevices and metasurfaces. Very recently, great efforts have been made to explore the effective active tuning of Mie-type magnetic resonances via applied voltages, heating, etc. for more sensitive optoelectronic and photothermal applications. Here, we constructed a new platform containing vanadium dioxide (VO₂) films and tungsten disulfide (WS₂) flakes to realize distinctive active tuning of the collective Mie resonances from silicon nanoparticle (Si NP) clusters and measure the resonance-enhanced local heating precisely. Through increasing the thickness of WS₂, we found new type active spectral evolution with high sensitivity during the phase change of VO₂. The temperature increase caused by local heating of different Si NP clusters can be determined through both scattering and photoluminescence (PL) measurements with the best thermal resolution less than 1 °C. The proposed platform provides a new way to enhance the active tuning of Mie resonance and detect the local heating sensitively. More importantly, we propose a new mechanism for measuring the photothermal effects of single dielectric nanoparticles for future energy and biomedical applications.

中文翻译：

主动调谐Mie共振以实现单个纳米颗粒的灵敏光热测量

具有Mie型共振的高折射率全介电纳米结构在构建光学纳米器件和超颖表面方面具有广阔的应用前景。最近，人们进行了很大的努力来探索通过施加电压，加热等方式对米氏型磁共振进行有效的主动调谐，以用于更敏感的光电和光热应用。在这里，我们构建了一个包含二氧化钒（VO ₂）薄膜和二硫化钨（WS ₂）薄片的新平台，以实现硅纳米粒子（Si NP）团簇的集体Mie共振的独特主动调谐，并精确测量共振增强的局部加热。通过增加WS ₂的厚度在VO ₂的相变过程中，我们发现了一种具有高灵敏度的新型有源光谱演化。可以通过散射和光致发光（PL）测量来确定由不同Si NP团簇的局部加热引起的温度升高，其最佳热分辨率低于1°C。所提出的平台提供了一种新的方式来增强三重共振的主动调谐并灵敏地检测局部发热。更重要的是，我们提出了一种新的机制来测量单个介电纳米粒子的光热效应，以用于未来的能源和生物医学应用。

更新日期：2020-03-26

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