Tunable polaritonic metasurface absorbers in mid-IR based on hexagonal boron nitride and vanadium dioxide layers
Tunable polaritonic metasurface absorbers in mid-IR based on hexagonal boron nitride and vanadium dioxide layers
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DOI：
10.1088/1361-6463/ab0262
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发表时间：
2019-04-17
影响因子：
3.4
通讯作者：
Aydin, Koray
中科院分区：
文献类型：
--
作者：
Song, Xianglian;Liu, Zizhuo;Aydin, Koray
在这里，提出并讨论了一种具有可切换光谱响应的超表面吸收器。该器件是通过将相变材料（二氧化钒，VO2）和自然双曲材料（六方氮化硼，hBN）相结合而构建的，在同一系统中的不同热条件下分别利用表面等离子体激元（SPP）和表面声子极化激元（SPhP）。具体来说，我们利用低于 VO2 临界温度 (T < T-c) 的 hBN 中的 SPhP 激发以及较高温度 (T > T-c) 下 VO2 层的 SPP 激发，在类似于 7.2 μm 的窄带近乎完美吸收与 8-12 μm 的宽带吸收之间切换。结果表明，SPP 和 SPhP 可以通过控制温度分别被激发，这为设计可调谐人造材料和器件以实现有前途的纳米光子学应用提供了新的机会。
Here, a metasurface absorber with switchable spectral response is proposed and discussed. The device is constructed by combining a phase change material (vanadium dioxide, VO2) and a naturally hyperbolic materials (hexagonal boron nitride, hBN), utilizing surface plasmon polaritons (SPPs) and surface phonon polaritons (SPhPs), respectively, at different thermal conditions in the same system. Specifically, we take advantage of the excitation of SPhP in hBN below the VO2 critical temperature (T < T-c) and SPP from VO2 layers at higher temperatures (T > T-c), to switch between narrow-band near-perfect absorption at similar to 7.2 mu m to broadband absorption at 8-12 mu m. It is shown that SPPs and SPhPs can be excited, respectively, by controlling the temperature, offering new opportunities in designing tunable artificial materials and devices for promising nanophotonics applications.