Optical absorption and heat conduction control in high aspect ratio silicon nanostructures for photothermal heating applications
Optical absorption and heat conduction control in high aspect ratio silicon nanostructures for photothermal heating applications
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DOI：
10.1016/j.apmt.2023.101824
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发表时间：
2023-06
影响因子：
8.3
通讯作者：
S. Ishii;N. Tanjaya;E. Shkondin;S. Murai;O. Takayama
中科院分区：
文献类型：
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作者：
S. Ishii;N. Tanjaya;E. Shkondin;S. Murai;O. Takayama
在光热加热中，在被照射材料中观察到的温度升高取决于其光吸收和热导率。各种各样的研究表明，可以使用各种纳米结构来定制光学吸收，包括超材料、等离子体结构、光子晶体和表面纹理。类似地，热导率也可以通过纳米结构来调节，包括声子晶体和超晶格。然而，很少有研究的潜力，同时控制光吸收和热传导，以优化光热加热过程。在这项研究中，硅孔和柱阵列的光吸收和热导率，通过改变它们的几何参数。随后的实验和数值模拟表明，纳米结构的热导率对光热加热效应的影响比它们的光吸收更大。柱阵列显示出比孔阵列更大的光热加热效应;然而，孔阵列在需要连接的情况下是有利的，如在光热检测器应用中。通过对纳米结构尺寸与其光热性质之间关系的理解，这种分析可以指导未来设计用于光热加热应用的周期性纳米结构。
In photothermal heating, the temperature increase observed in an irradiated material is dependent on its optical absorption and thermal conductivity. A wide variety of studies have shown that optical absorption can be tailored using various nanostructures, including metamaterials, plasmonic structures, photonic crystals, and surface texturing. Similarly, thermal conductivity can be also tuned by nanostructures, including phononic crystals and superlattices. However, few have examined the potential for the simultaneous control of optical absorption and heat conduction to optimize photothermal heating processes. In this study, silicon hole and pillar arrays are tailored for their optical adsorption and thermal conductivity by varying their geometrical parameters. Subsequent experiments and numerical simulations reveal that the thermal conductivity of the nanostructures has a stronger influence on the photothermal heating effect than their optical absorption. Pillar arrays show a larger photothermal heating effect than the hole arrays; nevertheless, hole arrays are advantageous where connectivity is required, as in photothermal detector applications. With this understanding of the relationship between nanostructure dimensions and their photothermal properties, this analysis may guide the future design of periodic nanostructures for photothermal heating applications.