Ultra-broadband infrared metasurface absorber

Guo, Wenliang; Liu, Yuexia; Han, Tiancheng

doi:10.1364/oe.24.020586

Cited by 195 publications

(84 citation statements)

References 30 publications

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“…We should note here that the applications of optical metasurfaces in the general sense of the word (i.e., patterned thin layers on a substrate) go beyond spatial wavefront manipulation. Thin light absorbers [79][80][81][82][83][84][85][86][87][88][89][90][91][92][93], optical filters [94][95][96][97][98][99][100][101][102][103][104][105][106], nonlinear [107][108][109][110][111][112][113][114], and anapole metasurfaces [115,116] are a few examples of such elements. This review is focused on applications of metasurfaces in wavefront manipulation, and therefore it doesn't cover these other types of metasurfaces.…”

Section: Recent Developmentsmentioning

confidence: 99%

A review of dielectric optical metasurfaces for wavefront control

et al. 2018

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During the past few years, metasurfaces have been used to demonstrate optical elements and systems with capabilities that surpass those of conventional diffractive optics. Here we review some of these recent developments with a focus on dielectric structures for shaping optical wavefronts. We discuss the mechanisms for achieving steep phase gradients with high efficiency, simultaneous polarization and phase control, controlling the chromatic dispersion, and controlling the angular response. Then we review applications in imaging, conformal optics, tunable devices, and optical systems. We conclude with an outlook on future potentials and challenges that need to be overcome. A. High-efficiency high-gradient phase controlSince high-contrast transmitarrays (HCA) are central to the most of the discussions of this section, we first briefly discuss their operation. We are primarily interested in the two-dimensional HCAs, and therefore we consider their case here, although much of the discussions are also valid for the one-dimensional case. In general, these devices are based on high-refractive-index dielectric nano-scatterers surrounded by low-index media [13, 38, 65, 67, 70-72, 76, 78]. The structure can be symmetric (i.e., with the substrate and capping layers having the same refractive indexes) [36] or asymmetric [66,67,76,78]. Depending on the materials and the required phase coverage, the thickness of the high-index layer is usually between 0.5λ 0 and λ 0 , where λ 0 is the free space wavelength. Typically, these structures are designed to be compatible with conventional microfabrication techniques;

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Section: Recent Developmentsmentioning

confidence: 99%

A review of dielectric optical metasurfaces for wavefront control

et al. 2018

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“…A black body that absorbs broadband omnidirectional radiation is an ideal absorber, which has applications in energy harvesting, photodetectors, photothermal energy generation, and concealment . Film‐based absorbers, such as multiple pairs of stacked metal/dielectric films or multilayer‐stacked films, are suitable for the large‐area fabrication.…”

Section: Performance and Fabrication Characteristics Of The State‐of‐mentioning

confidence: 99%

Large‐Area, Ultrathin Metasurface Exhibiting Strong Unpolarized Ultrabroadband Absorption

Yan

Jiang

et al. 2019

Advanced Optical Materials

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despite their sophisticated designs, most of these devices only work in a narrow bandwidth range and require complicated fabrication procedures. These issues impede large-area applications for energy harvesting and photothermal energy generation. A large-area, wide angular tolerance, broadband absorber with ultrathin metallic nanoparticles has been recently proposed. [38] However, the suitability of this device for photothermal energy generation applications remains unclear because the stability of these metallic nanostructures at high temperatures is usually low.Due to the outstanding properties, such as compatibility with the complementary metal oxide semiconductor (CMOS) processes, high temperature resistance, large loss in the visible range, and high reflectivity in the infrared (IR) range, [39] titanium nitride (TiN) has emerged as an ideal material for the preparation of near-perfect absorbers for the high-temperature solar/thermophotovoltaics applications. [39,40] A 5-cycle TiN/silicon dioxide (SiO 2 ) multilayer-based absorber has been reported with an average solar absorptivity of 0.68 [1] and a near-perfect absorption, which requires further enhancement. The high average absorptivity of ≈95% by a ringlike TiN layer using a metamaterial absorber was achieved for the entire visible range. [41] However, the bandwidth of these devices is limited in the visible range. For ultrabroadband light absorption, 3D-truncated TiN nanopillars have been demonstrated for the visible and NIR spectral regions with an average absorptivity of 0.94. [42] This TiN nanopillar-based device, which comprises silicon nanopillars with a large thickness (>1 µm), typically requires expensive, time-consuming fabrication processes, and its thermal emissivity is not verified. Therefore, there are few experimental reports on the large-area ultrathin TiN-based metasurfaces for the strong ultrabroadband light absorption with low thermal emissivity.In this paper, we demonstrate wide-angle ultrabroadband strong light absorption that covers almost the whole solar spectrum (250-2250 nm) by the TiN-based metasurface with an ultrathin thickness (330 nm) on a quartz substrate. The metasurface incorporates dielectric cylinder arrays, a TiN layer, and SiN x layers. This metasurface fundamentally differs from the previously reported absorbers. This device, which uses a symmetrical SiO 2 grating, is independent of incident polarization. Specifically, the carefully designed metasurface exhibits a prominent absorption of both polarizations over wide angles. The outstanding performances of this absorber are realized by Large-area, ultrathin devices with strong ultrabroadband absorption and high angular tolerance are in demand for applications such as ultraviolet protection, energy harvesting, photodetectors, and thermal imaging technology. Although there have been considerable efforts to design and fabricate these devices, the simultaneous realization of all desired properties has not been achieved. A 330 nm thick metasurface with an area of 3 cm 2 is e...

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“…Recent advances in this eld have witnessed the rapid development of the broadened absorption bandwidth (i.e., broadband PMAs) because broadband PMAs have both improved performance and increased capabilities. [11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27] Based on a range of literature reviews, we found that broadband PMAs can be obtained by employing two kinds of construction methods based on the unit structures of vertical stacking [11][12][13][14][15][16][17][18][19][20] or co-planar superlattices [21][22][23][24][25][26][27][28][29] consisting of several different dimensions of metallic elements. These two methods are not impeccable, however, and they suffer from some certain signicant disadvantages.…”

Section: Introductionmentioning

confidence: 99%

A broadband terahertz metamaterial absorber enabled by the simple design of a rectangular-shaped resonator with an elongated slot

et al. 2019

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Broadband metamaterial absorbers are of critical importance in practical applications, but their obtainment approaches are quite complex at present. We demonstrate here that a fairly simple structure design formed by a rectangular-shaped resonator having an elongated slot can be utilized to achieve a broadband absorption response at terahertz frequencies. More than 50% absorption in a continuous frequency range of 1.62 THz (with a central frequency of 2.05 THz) can be gained, and its relative absorption bandwidth is 79.02%, which is superior to that of previous broadband absorption devices. The basic principle of the broadband absorption originates from the superposition of four different but narrowly separated resonance peaks that resulted from different response positions of the suggested resonator.Results further reveal that the broadband terahertz absorption performance (or its four resonance peaks) can be controlled by the resonator dimensions. The suggested method can provide a new type of design strategy to realize broadband integrated terahertz absorption devices.

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Ultra-broadband infrared metasurface absorber

Cited by 195 publications

References 30 publications

A review of dielectric optical metasurfaces for wavefront control

A review of dielectric optical metasurfaces for wavefront control

Large‐Area, Ultrathin Metasurface Exhibiting Strong Unpolarized Ultrabroadband Absorption

A broadband terahertz metamaterial absorber enabled by the simple design of a rectangular-shaped resonator with an elongated slot

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