Infrared Perfect Ultra-narrow Band Absorber as Plasmonic Sensor

Abstract

We propose and numerically investigate a novel perfect ultra-narrow band absorber based on a metal-dielectric-metaldielectric-metal periodic structure working at near-infrared region, which consists of a dielectric layer sandwiched by a metallic nanobar array and a thin gold film over a dielectric layer supported by a metallic film. The absorption efficiency and ultra-narrow band of the absorber are about 98 % and 0.5 nm, respectively. The high absorption is contributed to localized surface plasmon resonance, which can be influenced by the structure parameters and the refractive index of dielectric layer. Importantly, the ultra-narrow band absorber shows an excellent sensing performance with a high sensitivity of 2400 nm/RIU and an ultra-high figure of merit of 4800. The FOM of refractive index sensor is significantly improved, compared with any previously reported plasmonic sensor. The influences of structure parameters on the sensing performance are also investigated, which will have a great guiding role to design high-performance refractive index sensors. The designed structure has huge potential in sensing application.

Design and Analytical Evaluation of a High Resistance Sensitivity Bolometer Sensor Based on Plasmonic Metasurface Structure

“…Originally, high absorbance at mid-infrared and long-wave infrared can be attained based on plasmonic surface plasmon resonance structure with sharp peak absorption and bandwidth depend on resonator (Q). Hence, this structure would improve the fabrication tolerances [9][10][11][12]. Usually, high absorbance can be achieved using a plasmonic structure, but the bandwidth is often limited.…”

Bismuth-based metamaterials: from narrowband reflective color filter to extremely broadband near perfect absorber

“…These metamaterial-based perfect absorbers can be employed in various applications. While these narrowband absorbers are of great interest for sensing and spectroscopy applications [1][2][3][4][5][6][7], several other areas such as photovoltaic and thermal photovoltaic [8][9][10][11][12][13][14] steam generation [15,16] and photodetection [17] require the spectral broadness.…”

“…The common types of metals for this MIM cavity design are noble metals such as gold (Au), silver (Ag), and aluminum (Al). However, in general, the response of this type of cavity is narrow [2,4,6,[18][19][20][21][22][23][24]. To broaden the absorption bandwidth (BW) of this design, different strategies have been proposed.…”

Tuning the metal filling fraction in metal-insulator-metal ultra-broadband perfect absorbers to maximize the absorption bandwidth

“…Depending on the device configuration and the materials, this perfect absorption can be attained in a narrow or a broad frequency range. While these narrowband absorbers are of great interest for sensing and spectroscopy applications [3][4][5][6][7][8][9], several other areas such as photovoltaic and thermal photovoltaic [10][11][12][13][14][15], steam generation [16,17], and photodetection [18] require the spectral broadness.…”