Why Metallic Surfaces with Grooves a Few Nanometers Deep and Wide May Strongly Absorb Visible Light

Perchec, Jérôme Le; Quemerais, Pascal; Barbara, Aude; López-Rı́os, T.

doi:10.1103/physrevlett.100.066408

Cited by 210 publications

(134 citation statements)

References 33 publications

(42 reference statements)

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“…By structuring noble metal surfaces on the subwavelength scale, localized and delocalized surface plasmon resonances can be designed to produce high absorption on otherwise refl ective surfaces. Resonant light absorption in metallic structures has been widely studied both theoretically and experimentally in arrays of metallic gratings 1 -5 , nanoparticles 6,7 and subwavelength slits 8,9 . Metamaterials are also promising candidates to enhance electromagnetic wave absorption, and have been shown to yield perfect absorption at microwave 10 , terahertz 11 and infrared 12 -14 frequencies.…”

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confidence: 99%

Broadband polarization-independent resonant light absorption using ultrathin plasmonic super absorbers

et al. 2011

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Resonant plasmonic and metamaterial structures allow for control of fundamental optical processes such as absorption, emission and refraction at the nanoscale. Considerable recent research has focused on energy absorption processes, and plasmonic nanostructures have been shown to enhance the performance of photovoltaic and thermophotovoltaic cells. Although reducing metallic losses is a widely sought goal in nanophotonics, the design of nanostructured ' black ' super absorbers from materials comprising only lossless dielectric materials and highly refl ective noble metals represents a new research direction. Here we demonstrate an ultrathin (260 nm) plasmonic super absorber consisting of a metal -insulatormetal stack with a nanostructured top silver fi lm composed of crossed trapezoidal arrays. Our super absorber yields broadband and polarization-independent resonant light absorption over the entire visible spectrum (400 -700 nm) with an average measured absorption of 0.71 and simulated absorption of 0.85. Proposed nanostructured absorbers open a path to realize ultrathin black metamaterials based on resonant absorption.

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confidence: 99%

Broadband polarization-independent resonant light absorption using ultrathin plasmonic super absorbers

et al. 2011

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“…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: 58%

“…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: 65%

“…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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“…It is worth noting that the resonance mechanism is related to different gap plasmon modes observed in textured metal surfaces at the infrared and visible regimes. 12,13 ■ RESULTS AND DISCUSSION This section discusses numerical and experimental results and elucidates the cavity absorption performance in terms of electromagnetic functionality and corresponding thermal behavior.…”

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Plasmonic Resonance toward Terahertz Perfect Absorbers

et al. 2014

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Metamaterial perfect absorbers have garnered significant interest with applications in sensing, imaging, and energy harnessing. Of particular interest are terahertz absorbers to overcome the weak terahertz response of natural materials. Here, we propose lossy plasmonic resonance in silicon-based annular microcavities for perfect terahertz absorption. This mechanism is in stark contrast to earlier demonstrations of conventional terahertz perfect absorbers that invoke Lorentzian electric and magnetic resonances. A fundamental cavity mode coupled to coaxial surface plasmon polaritons is responsible for the predicted exceptional absorption of −58 dB with a 90% absorption bandwidth of 30%. The performance is in agreement with experimental validation and consistent with critical coupling and resonance conditions. This specific cavity design possesses great thermal isolation and minimal electromagnetic coupling between unit cells. These unique features exclusive to the plasmonic cavity introduce a promising avenue for terahertz imaging with enhanced contrast, resolution, and sensitivity. KEYWORDS: metamaterial, plasmonics, perfect absorber, cavity mode, THz-TDS, terahertz, multiphysics simulation R esearch on perfect absorption has recently become a very active topic in the rapidly growing field of metamaterials. Providing enhanced performance and flexibility, perfect absorbers have been realized in different applications, including imaging, sensing, and energy harnessing. Soon after the seminal development by Padilla and co-workers, 1,2 metamaterial-based perfect absorbers have been demonstrated across the spectrum, from the microwave, to terahertz, infrared, and optical bands. 3 In general, these traditional perfect absorbers appeared in the form of metallic resonators on a ground plane, designed to eliminate the reflection and enhance the absorption. The perfect absorption mechanism was explained with the coexistence of Lorentzian electric and magnetic responses that match the impedance of the structure to free space and at the same time imposing large energy dissipation on resonance. Another explanation involved wave interference theory where multipath reflections originating from different interfaces lead to completely destructive interference in the direction of reflection. 4 Alternatively, perfect absorption was interpreted as nullified reflection by an out-of-phase wave reradiated from induced electric and magnetic surface currents. 5 Of relevance to this article are perfect absorbers at infrared and visible frequencies, where metals with relatively limited conductivity can support bound surface waves or surface plasmon polaritons (SPPs). Earlier implementations of plasmonic absorbers in the near-infrared 6,7 and visible 8,9 regimes adopted the conventional design of a metallic dipole array on a ground plane separated by a dielectric spacer. This concept was extended to random nanoparticles on a ground plane that exhibit electric and magnetic resonances for visible light absorption. 5,10 Unlike perfec...

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Why Metallic Surfaces with Grooves a Few Nanometers Deep and Wide May Strongly Absorb Visible Light

Cited by 210 publications

References 33 publications

Broadband polarization-independent resonant light absorption using ultrathin plasmonic super absorbers

Broadband polarization-independent resonant light absorption using ultrathin plasmonic super absorbers

Infrared Perfect Ultra-narrow Band Absorber as Plasmonic Sensor

Plasmonic Resonance toward Terahertz Perfect Absorbers

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