Abstract
Wavelength-selective infrared (IR) absorbers have attracted considerable interest due to their potential for a wide range of applications. In particular, they can be employed as advanced uncooled IR sensors that identify objects through their radiation spectra. Herein, we propose a mushroom plasmonic metamaterial absorber incorporating tube-shaped metal posts (MPMAT) for use in the long-wavelength IR (LWIR) region. The MPMAT design consists of a periodic array of thin metal micropatches connected to a thin metal plate via tube-shaped metal posts. Both the micropatches and posts can be constructed simultaneously as a result of the tube-shaped structure of the metal post structure; thus, the fabrication procedure is both simple and low cost. The absorption properties of these MPMATs were assessed both theoretically and experimentally, and the results of both investigations demonstrated that these devices exhibit suitable levels of LWIR absorption regardless of the specific tube-shaped structures employed. It was also found to be possible to tune the absorption wavelength by varying the micropatch width and the inner diameter of the tube-shaped metal posts, and to obtain absorbance values of over 90%. Focal plane array structures based on such MPMATs could potentially serve as high-performance, low-cost, multi-spectral uncooled IR image sensors.
Highlights
In recent years, there has been remarkable progress in electromagnetic wave (EW) absorber technology as a result of research into plasmonics [1,2] and metamaterials [3,4,5]
These data indicate that the absorption wavelength can be controlled by varying the micropatch width, and the absorption wavelength can be longer than the micropatch period, which can lead to smaller pixel size compared with twodimensional plasmonic absorbers [10,11]
Intense absorbance of over 90% was achieved with both samples, demonstrating that the absorption peak wavelength primarily depends on the micropatch width and that metamaterial absorber incorporating tube-shaped metal posts (MPMAT) can successfully operate at approximately 10 μm in a single mode
Summary
There has been remarkable progress in electromagnetic wave (EW) absorber technology as a result of research into plasmonics [1,2] and metamaterials [3,4,5]. Prevents these absorbers from operating at long IR wavelengths in the vicinity of 10 μm [22] This is an Recently,wavelength we reported the feasibility of mushroom metamaterial absorbers (MPMAs) important region for the observation of livingplasmonic beings as well as for the sensing of gaseous compounds as ethanol. There no resonant modes in thestructures metal posts, which enables complicated stepwise fabrication procedure that produces the metal posts and the micropatches single-mode operation The construction of these mushroom-shaped structures normally requires a complicated stepwise fabricationcauses procedure that produces the metal postsdegenerate and the micropatches separately [24], and this complexity structural fluctuations, which the absorption separately [24], and this complexity causes structural fluctuations, which degenerate the absorption properties and restrict the practical applications of MPMAs. In the present paper, we report the properties and restrict practical applications of MPMAs. In the (MPMATs) present paper,aswe report the design design and fabrication ofthe. Problem, and the results of a characterization of these devices
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