Structured Metal Film as a Perfect Absorber

Xiong, Xiang; Jiang, Shigui; Hu, Yuhui; Peng, Ru‐Wen; Wang, Mu

doi:10.1002/adma.201300223

Cited by 147 publications

(74 citation statements)

References 39 publications

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“…U-shape SRRs have been popular and widely accepted as building blocks for various 2D and 3D MMs 3,14,19,[36][37][38][39] . Conventionally, the resonances of an SRR can be excited by incident light with the electric field (E) polarized parallel to the U-plane (for instance, along the x-direction as shown in Figure 3a) or, alternatively, with the magnetic field perpendicular to the U-plane 36,40 .…”

Section: Unusual Fano Resonances Of Mh-vsrr Arraysmentioning

confidence: 99%

Directly patterned substrate-free plasmonic “nanograter” structures with unusual Fano resonances

et al. 2015

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The application of three-dimensional (3D) plasmonic nanostructures as metamaterials (MMs), nano-antennas, and other devices faces challenges in producing metallic nanostructures with easily definable orientations, sophisticated shapes, and smooth surfaces that are operational in the optical regime and beyond. Here, we demonstrate that complex 3D nanostructures can be readily achieved with focused-ion-beam irradiation-induced folding and examine the optical characteristics of plasmonic ''nanograter'' structures that are composed of free-standing Au films. These 3D nanostructures exhibit interesting 3D hybridization in current flows and exhibit unusual and well-scalable Fano resonances at wavelengths ranging from 1.6 to 6.4 mm. Upon the introduction of liquids of various refractive indices to the structures, a strong dependence of the Fano resonance is observed, with spectral sensitivities of 1400 nm and 2040 nm per refractive index unit under figures of merit of 35.0 and 12.5, respectively, for low-order and high-order resonance in the near-infrared region. This work indicates the exciting, increasing relevance of similarly constructed 3D free-standing nanostructures in the research and development of photonics and MMs.

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Section: Unusual Fano Resonances Of Mh-vsrr Arraysmentioning

confidence: 99%

Directly patterned substrate-free plasmonic “nanograter” structures with unusual Fano resonances

et al. 2015

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“…As shown in Fig. 2a, for TM polarization configuration, when the refractive index of the sensing material is 1.02, the resonance absorption peak of the structure is found at 2449.87 nm with FWHM of 0.5 nm, which is much narrower than previously reported plasmonic refractive index sensor [22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39]. The magnetic field H and electric field E distributions at resonance are calculated Figure 2b illustrates that the magnetic field mainly locates in the dielectric spacer among two gold nanobars and the thin gold film, which indicates the coupling effect of the nanostructures caused by LSPR.…”

Section: Resultsmentioning

confidence: 60%

“…7d, the sensitivity (S) of the sensor is 2400 nm/RIU, while FWHMs can be narrower than 0.5 nm. Therefore, the FOM of the plasmonic sensor can reach 4800, which is improved remarkably compared to any previously reported plasmonic metamaterial structure [20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37].…”

Section: Resultsmentioning

confidence: 83%

“…Thus, it is very meaningful to design an ultra-high FOM refractive index sensor with a simple structure. Unfortunately, the previously reported plasmonic sensors based on metamaterial structure generally have a relatively low FOM <600 [22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39], which will severely limit their further development and application. Shen designed a gold mushroom array structure with a narrow FWHM of 10 nm and a high FOM of 108 [22].…”

Section: Introductionmentioning

confidence: 99%

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Infrared Perfect Ultra-narrow Band Absorber as Plasmonic Sensor

Liu

2016

Asia Communications and Photonics Conference 2016

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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.

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“…However, it may be highly challenging to satisfy this condition with the intrinsic IR absorptions in bulk materials and engineered IR absorption within planar photonic devices. Alternatively, highly selective emission can be achieved in artificially designed metallic nano/microstructures, such as, plasmonic structures,64, 65, 66, 67, 68, 69, 70, 71 metallic photonic crystals,72, 73, 74, 75 and metamaterials 76, 77, 78, 79, 80. However, tuning the emission of these microstructures to achieve selective IR emission covering the entire 8–13 μm wavelengths range can still be a significant challenge.…”

Section: Recent Progress On Highly Efficient and Daytime Radiative Comentioning

confidence: 99%

Radiative Cooling: Principles, Progress, and Potentials

2016

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The recent progress on radiative cooling reveals its potential for applications in highly efficient passive cooling. This approach utilizes the maximized emission of infrared thermal radiation through the atmospheric window for releasing heat and minimized absorption of incoming atmospheric radiation. These simultaneous processes can lead to a device temperature substantially below the ambient temperature. Although the application of radiative cooling for nighttime cooling was demonstrated a few decades ago, significant cooling under direct sunlight has been achieved only recently, indicating its potential as a practical passive cooler during the day. In this article, the basic principles of radiative cooling and its performance characteristics for nonradiative contributions, solar radiation, and atmospheric conditions are discussed. The recent advancements over the traditional approaches and their material and structural characteristics are outlined. The key characteristics of the thermal radiators and solar reflectors of the current state‐of‐the‐art radiative coolers are evaluated and their benchmarks are remarked for the peak cooling ability. The scopes for further improvements on radiative cooling efficiency for optimized device characteristics are also theoretically estimated.

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Structured Metal Film as a Perfect Absorber

Cited by 147 publications

References 39 publications

Directly patterned substrate-free plasmonic “nanograter” structures with unusual Fano resonances

Directly patterned substrate-free plasmonic “nanograter” structures with unusual Fano resonances

Infrared Perfect Ultra-narrow Band Absorber as Plasmonic Sensor

Radiative Cooling: Principles, Progress, and Potentials

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