Near-perfect absorber with ultrawide bandwidth in infrared region using a periodically chirped structure

Song, Yanqin; Wang, Chinhua; Lou, Yimin; Cao, Bing; Li, Xiao Feng

doi:10.1016/j.optcom.2013.05.014

Cited by 14 publications

(14 citation statements)

References 17 publications

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“…Complex tungsten gratings, which are a superposition of a number of simple gratings with different periods, were proposed by Chen et al (Figure 12 a) [ 120 ] in order to create a broadband absorption peak from 0.8 to 1.7 µm. [ 122 ] A similar principle was used in the periodically chirped Au/Ge/Au 1D slab array structure designed by Song et al, [ 123 ] where each subsequent element width was larger than the previous one. [ 121 ] In deep 1D gratings, a broadband response can be due to cavity resonance.…”

Section: Broadband Response Designmentioning

confidence: 99%

“…[ 7 ] Another method for inhibiting the chemical reactions of metals with surrounding gasses is to use protective thin-fi lm coatings. [ 30,31,101,102,105,108,110,123,127,131,139 ] Some of the most common choices for a dielectric spacer layer in magnetic resonance-based absorbers are Al 2 O 3 , [ 30,31,101,102,110,115 ] SiO 2 , [ 14,89,99,74,75,119 ] and MgF 2 . [ 64 ] While having highly desirable thermal properties, tungsten is diffi cult to work with from a microfabrication and patterning point of view, so attempts have been made to replace it with more suitable metals like tantalum (Ta) [ 29,65 ] and titanium (Ti).…”

Section: Choice Of Materialsmentioning

confidence: 99%

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Micro‐ and Nanostructured Surfaces for Selective Solar Absorption

Khodasevych

Wang

Mitchell

et al. 2015

Advanced Optical Materials

169

114

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Applications utilizing solar energy are being actively developed due to increasing demand for environmentally friendly and sustainable energy solutions. The sun is a source of tremendous energy spanning from ultraviolet to infrared wavelengths, with the maximum energy in the visible range, corresponding to a blackbody temperature of 5780 K. [ 1 ] It is estimated that the amount of solar energy reaching Earth's surface is enough to Effi cient absorption of solar radiation is desired for the renewable energy sector, such as solar thermophotovoltaics and solar thermal applications. In order to minimize thermal re-radiation, wavelength-selective devices are required. Absorbers with structured surfaces are attractive because they derive their electromagnetic properties to a greater extent from their geometry and to a lesser extent from the intrinsic properties of the constituent materials. Thus, they offer greater fl exibility in the design and control of absorber features and can be tailored to suit requirements. This article reviews various classes of patterned structures: photonic crystals, metal-dielectric-metal slab arrays, metamaterials, and nanostructures operating in the visible and infrared wavelength ranges. Operation requirements, design principles and underlying physical phenomena, material and temperature considerations, as well as fabrication methods are discussed. Recent progress in achieving various desirable absorber features, such as broadband and multiband operation, polarization and angle independence, fl exibility, and tunability is presented. Suggestions are also given regarding future research directions.

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Section: Broadband Response Designmentioning

confidence: 99%

Section: Choice Of Materialsmentioning

confidence: 99%

Micro‐ and Nanostructured Surfaces for Selective Solar Absorption

Khodasevych

Wang

Mitchell

et al. 2015

Advanced Optical Materials

169

114

View full text Add to dashboard Cite

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“…[30][31][32][33][34][35][36][37][38] In this letter, we demonstrate, both computationally and experimentally, a fully functional near-perfect MMA in the long wavelength IR (LWIR) range. We used a bi-layer pattern to achieve a wide-angle, polarization-insensitive, broadband performance which is superior overall to many single layer 30,31,33,35 and previous multi-layer nested designs 39 in the IR regimes and which is comparable to state-of-the-art in other frequency regimes cited above. Experimentally, we achieve an absorptance of up to 99.9% with a 90% absorptance bandwidth of over 2 lm or about 20% of the center LWIR wavelength of 10 lm.…”

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confidence: 90%

Bi-layer metamaterials as fully functional near-perfect infrared absorbers

Adomanis

Watts

Koirala

et al. 2015

Applied Physics Letters

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In this letter, we discuss the design, fabrication, and experimental characterization of a bi-layer fully functional near-perfect metamaterial absorber (MMA) in the long-wavelength infrared (LWIR), which is broadband and generally insensitive to polarization up to a 60 incidence angle. A spectral absorptance of !99% was attained simultaneously at multiple LWIR wavelengths, with a bandwidth of 2 lm where the absorptance is !90%. This remarkable behavior is attributed to the strong mixing of coupling modes between the two resonators and the ground plane in the presence of a lossy dielectric, in which single layer structures do not exhibit. Furthermore, we show, by comparing two different MMA structures, how the absorption can be tailored by design within and across several IR subdivisions through a slight change in geometrical parameters. The bi-layer MMA has the immediate application of a functionally versatile, low-profile thermal sensor or emitter. Perfect absorbers in the infrared (IR) are particularly exciting due to their applicability as thermal emission control surfaces, among other applications. Efforts have been made to tailor the thermal emission of structures through the use of 1-D and 2-D gratings, 1,2 photonic crystals, 3,4 and microstrip patch arrays.5 However, many of these solutions are narrowband and lack functionality at certain polarizations or incidence angles, all of which are critical to practical thermal applications where maximum absorption of light is desired. 6 Since the experimental demonstration of a near-unity metamaterial absorber (MMA) in the microwave spectrum in 2008, 7 a great deal of research has been invested into establishing the utility of a perfect absorber for real-world application. Work rapidly expanded into the terahertz, 8 short-wave IR, 9 mid-wave IR, 10 near-infrared, 11,12 and visible range; 13 and with it came a flood of attempts to increase bandwidth and insensitivities to polarization and incidence angles (see Ref.6 for a comprehensive review). Initially, most of these designs suffered in one area or another: multi-band and wideangle designs were still narrow-band 14-17 or polarization-dependent, 7,8 while these wholly insensitive broadband designs did not attain a consistent absorptance over 90%. 18,19 However, significant advancements have been made in creating "fully functional" near-perfect absorbers: those which exhibit strong broadband responses while being simultaneously angle and polarization insensitive. In the past year alone, fully functional MMAs have been demonstrated in the microwave, 20-25 terahertz, 26-28 and optical 29 regimes. Despite this advancement, we found a lack in development of fully functional IR MMAs. [30][31][32][33][34][35][36][37][38] In this letter, we demonstrate, both computationally and experimentally, a fully functional near-perfect MMA in the long wavelength IR (LWIR) range. We used a bi-layer pattern to achieve a wide-angle, polarization-insensitive, broadband performance which is superior overall to many single layer 30,31,33...

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“…Broadband TLA has been desired for many applications. In order to achieve broadband plasmonic TLA, super-lattice, complex motifs or multiple resonators have been placed in a unit cell of MIM structures [25][26][27][28][29][30][31]. An array of chirped MIM resonators has been used to achieve a broadband response [27].…”

Section: Introductionmentioning

confidence: 99%

“…In order to achieve broadband plasmonic TLA, super-lattice, complex motifs or multiple resonators have been placed in a unit cell of MIM structures [25][26][27][28][29][30][31]. An array of chirped MIM resonators has been used to achieve a broadband response [27]. Multiplexed plasmonic resonances in metallic dual-lattices have been used for the broadband detector [25,26].…”

Section: Introductionmentioning

confidence: 99%

Broadband Absorption in Patterned Metal/Weakly-Absorbing-Spacer/Metal with Graded Photonic Super-Crystal

et al. 2021

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It is challenging to realize the complete broadband absorption of near-infrared in thin optical devices. In this paper, we studied high light absorption in two devices: a stack of Au-pattern/insulator/Au-film and a stack of Au-pattern/weakly-absorbing-material/Au-film where the Au-pattern was structured in graded photonic super-crystal. We observed multiple-band absorption, including one near 1500 nm, in a stack of Au-pattern/spacer/Au-film. The multiple-band absorption is due to the gap surface plasmon polariton when the spacer thickness is less than 30 nm. Broadband absorption appears in the near-infrared when the insulator spacer is replaced by a weakly absorbing material. E-field intensity was simulated and confirmed the formation of gap surface plasmon polaritons and their coupling with Fabry–Pérot resonance.

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Near-perfect absorber with ultrawide bandwidth in infrared region using a periodically chirped structure

Cited by 14 publications

References 17 publications

Micro‐ and Nanostructured Surfaces for Selective Solar Absorption

Micro‐ and Nanostructured Surfaces for Selective Solar Absorption

Bi-layer metamaterials as fully functional near-perfect infrared absorbers

Broadband Absorption in Patterned Metal/Weakly-Absorbing-Spacer/Metal with Graded Photonic Super-Crystal

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