Nanophotonics
Nanophotonics
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DOI：
10.1201/9781315220949-24
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发表时间：
2018-10
期刊：
影响因子：
--
通讯作者：
Satoshi Kawata;Yasushi Inouye;Hong-Bo Sun
中科院分区：
文献类型：
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作者：
Satoshi Kawata;Yasushi Inouye;Hong-Bo Sun
高的光学吸收率或大的吸收截面对于充分利用光的照射进行光热加热是必要的。最近，氮化钛（TiN）纳米结构已被证明是强大的光学范围内的光吸收，由于其非辐射衰减过程增强了广泛的等离子体共振。由于光热产生的热量消散到周围环境中，因此抑制TiN纳米结构的热传递对于最大化光热温度升高至关重要。在目前的工作中，与平面TiN膜相比，具有亚波长周期性的高纵横比TiN纳米结构已被证明可以使用纳米管样品将光热温度提高100倍。其原因是由于极端各向异性的有效导热系数。我们的工作表明，高纵横比TiN纳米结构在改善光热加热方面是有效的，它们可以用于各种应用，如太阳能加热，化学反应和微流体。
High optical absorptivity or a large absorption cross-section is necessary to fully utilize the irradiation of light for photothermal heating. Recently, titanium nitride (TiN) nanostructures have been demonstrated to be robust optical absorbers in the optical range owing to their nonradiative decay processes enhanced by broad plasmon resonances. Because the photothermally generated heat dissipates to the surroundings, suppressing heat transfer from TiN nanostructures is crucial for maximizing the photothermal temperature increase. In the current work, compared to the planar TiN film, high-aspect-ratio TiN nanostructures with subwavelength periodicities have been demonstrated to enhance the photothermal temperature increase by a 100-fold using nanotube samples. The reason is attributed to the extremely anisotropic effective thermal conductivities. Our work has revealed that high-aspect-ratio TiN nanostructures are effective in improving photothermal heating, and they can be used in various applications, such as solar heating, chemical reactions, and microfluidics.