Abstract We demonstrate the near-unity absorption of multilayer structures in the mid-infrared (MIR). The first configuration consists of a distributed Bragg reflector and a subwavelength-thin phononic film on top. Optical waves are confined within the cavity and the interface of the top layer, resulting in narrowband selective perfect absorption at the wavelength of 12.56 μm, which is of particular interest for many technological applications. Thus, highly spectral selective thermal emission can emerge from the engineered phononic-photonic structure. Tamm absorber can also be realized when the light from the phononic film side is perfectly absorbed. Reflectance of the fabricated sample is measured using a Fourier transform infrared spectrometer (FTIR) and matches the simulations well. Our findings will pave a new avenue for harness surface phonon (SPh) modes in the MIR, which could benefit applications such as radiative cooling, selective thermal emission and MIR sensing.

中文翻译：

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通过用薄声子膜控制光学 Tamm 状态来实现光谱选择性中红外吸收体/发射体

摘要 我们证明了多层结构在中红外 (MIR) 中的近统一吸收。第一种配置由分布式布拉格反射器和顶部的亚波长薄声子膜组成。光波被限制在腔体和顶层的界面内，导致在 12.56 μm 波长处产生窄带选择性完美吸收，这对于许多技术应用来说尤其重要。因此，高光谱选择性热发射可以从工程声子光子结构中出现。当来自声子膜侧的光被完全吸收时，也可以实现Tamm吸收器。使用傅立叶变换红外光谱仪 (FTIR) 测量制造样品的反射率，并与模拟结果很好地匹配。