Mehrzad Hossein, Habibimoghaddam Fatemeh, Mohajerani Ezeddin, Mohammadimasoudi Mohammad
Opt Lett. 2020 Apr 15;45(8):2355-2358. doi: 10.1364/OL.387789.
Photothermal effect in plasmonic nanostructures (thermoplasmonic), as a nanoscale heater, has been widely used in biomedical technology and optoelectronic devices. However, the big challenge in this effect is the quantitative characterization of the delivered heat to the surrounding environment. In this work, a plasmonic metasurface (as a nanoheater), and a Fabry-Perot (FP) cavity including liquid crystal (as a thermometer element) are integrated. The metasurface is manufactured through a bottom-up deposition method and has a near perfect absorption that causes an efficient temperature rising in the photothermal experiment under a low intensity of irradiation ($0.25; {\rm W}/{{\rm cm}^2}$0.25W/cm). Generated heat from the metasurface dissipates to the liquid crystal (LC) layer and makes a spectral shift of FP modes. More than 50°C temperature elevation with accuracy of 1.3°C are measured based on the consistency of anisotropic thermo-tropic data of the LC and a spectral shift of FP modes. The calculated figure of merit (FoM) of the constructed device, which indicates the temperature sensitivity, is 22. The FoM is four times more than other reported thermometry devices with broad spectral width. The device can be also used as an all-optical device to control the plasmonic resonance spectrum.
等离子体纳米结构中的光热效应（热等离子体效应）作为一种纳米级加热器，已在生物医学技术和光电器件中得到广泛应用。然而，这种效应面临的一大挑战是对传递到周围环境的热量进行定量表征。在这项工作中，集成了一个等离子体超表面（作为纳米加热器）和一个包含液晶的法布里 - 珀罗（FP）腔（作为温度计元件）。该超表面通过自下而上的沉积方法制造，具有近乎完美的吸收率，在低辐照强度（$0.25; {\rm W}/{{\rm cm}^2}$）的光热实验中能有效升温。超表面产生的热量消散到液晶（LC）层，导致FP模式发生光谱偏移。基于液晶的各向异性热致数据的一致性和FP模式的光谱偏移，测量到温度升高超过50°C，精度为1.3°C。所构建器件的计算品质因数（FoM）（表明温度灵敏度）为22。该FoM比其他报道的具有宽光谱宽度的测温器件高出四倍。该器件还可以用作全光器件来控制等离子体共振光谱。
