MEMS-based meta-emitter with actively tunable radiation power characteristic

IF 5.5 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Nanoscale Research Letters Pub Date : 2024-08-24 DOI:10.1186/s11671-024-04088-4

Kunye Li, Yuhao Liang, Yu-Sheng Lin

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Abstract

We propose a meta-emitter based on micro-electro-mechanical system (MEMS) technology. The main structure of the meta-emitter unit cell is composed of four symmetrically split crosses of Au and SiO₂ bilayer cantilevers. By changing the size of the cantilevers, this MEMS-based meta-emitter can realize the tunable perfect absorption, and the absorption spectrum is within the longwave infrared (LWIR) wavelength from 8.90 to 11.90 µm. When the surface temperature of the meta-emitter rises, the electrothermal actuation mechanism is performed through the different thermal expansion coefficient (TEC) of the bilayer cantilevers. Therefore, the cantilevers will be bent downward and the bending height of the cantilevers decreases linearly. In such case, the peak value of thermal radiation power can be tuned from the wavelength of 9.52 µm to 10.48 µm when the temperature of meta-emitter is increased from 293 to 1290 K. This proposed MEMS-based meta-emitter is an excellent LWIR light source and has potential application prospects in gas sensing, infrared spectroscopy analysis, medical care and so on.

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基于 MEMS 的元发射器，具有主动可调的辐射功率特性。

我们提出了一种基于微机电系统（MEMS）技术的元发射器。元发射极单元的主要结构由四个对称分割的金和二氧化硅双层悬臂交叉组成。通过改变悬臂的尺寸，这种基于 MEMS 的元发射器可以实现可调的完美吸收，吸收光谱在 8.90 至 11.90 µm 的长波红外（LWIR）波长范围内。当元发射器的表面温度升高时，通过双层悬臂的不同热膨胀系数（TEC）来实现电热致动机制。因此，悬臂将向下弯曲，悬臂的弯曲高度线性降低。在这种情况下，当元发射器的温度从 293 K 升至 1290 K 时，热辐射功率的峰值可从 9.52 µm 调至 10.48 µm。

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来源期刊

Nanoscale Research Letters 工程技术-材料科学：综合

CiteScore

11.30

自引率

0.00%

发文量

110

审稿时长

48 days

期刊介绍： Nanoscale Research Letters (NRL) provides an interdisciplinary forum for communication of scientific and technological advances in the creation and use of objects at the nanometer scale. NRL is the first nanotechnology journal from a major publisher to be published with Open Access.