Large-scale, low-cost, broadband and tunable perfect optical absorber based on phase-change material

Mou, Nanli; Liu, Xiaolong; Wei, Tao; Dong, Hongxing; He, Qiong; Zhou, Lei; Zhang, Yaqiang; Zhang, Long; Sun, Shulin

doi:10.1039/c9nr07602f

Cited by 104 publications

(48 citation statements)

References 43 publications

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“…Since Landy et al demonstrated the first metamaterial absorber with one perfect absorption peak in the microwave band through an experiment 19 , the control and engineering of the spectral absorption properties of MPAs has attracted significant interest. In their experiment, broadband perfect absorption was achieved with MPAs in microwave regime [20][21][22][23][24] and was extended from visible [25][26][27][28][29][30][31][32][33][34][35][36][37] , infrared [38][39][40][41][42][43][44][45][46][47][48][49][50][51] and THz [52][53][54][55][56][57] bands. This study will compare these representative theoretical and experimental works on the topic of broadband MPAs from visible to infrared bands in supplement document.…”

Section: Introductionmentioning

confidence: 98%

Ultra-broadband metamaterial absorbers from long to very long infrared regime

et al. 2021

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Broadband metamaterials absorbers with high absorption, ultrathin thickness and easy configurations are in great demand for many potential applications. In this paper, we first analyse the coupling resonances in a Ti/Ge/Ti three-layer absorber, which can realise broadband absorption from 8 to 12 μm. Then we experimentally demonstrate two types of absorbers based on the Ti/Ge/Si3N4/Ti configuration. By taking advantage of coupling surface plasmon resonances and intrinsic absorption of lossy material Si3N4, the average absorptions of two types of absorbers achieve almost 95% from 8 to 14 μm (experiment result: 78% from 6.5 to 13.5 μm). In order to expand the absorption bandwidth, we further propose two Ti/Si/SiO2/Ti absorbers which can absorb 92% and 87% of ultra-broadband light in the 14–30 μm and 8–30 μm spectral range, respectively. Our findings establish general and systematic strategies for guiding the design of metamaterial absorbers with excellent broadband absorption and pave the way for enhancing the optical performance in applications of infrared thermal emitters, imaging and photodetectors.

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Section: Introductionmentioning

confidence: 98%

Ultra-broadband metamaterial absorbers from long to very long infrared regime

et al. 2021

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“…However, a big problem is that the shifting the frequency can lead to a mismatch in impedance, which limits the adjustable range with high efficiency. Additionally, in most cases, the real part (n) and imaginary part (k) of the refractive index both change during the process, which further enlarges the mismatch and leads to a sharp drop in absorptivity during the tuning process [ 39 ].…”

Section: Introductionmentioning

confidence: 99%

Demonstration of Thermally Tunable Multi-Band and Ultra-Broadband Metamaterial Absorbers Maintaining High Efficiency during Tuning Process

Mou

Tang

et al. 2021

Materials

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Metamaterial absorbers (MMAs) with dynamic tuning features have attracted great attention recently, but most realizations to date have suffered from a decay in absorptivity as the working frequency shifts. Here, thermally tunable multi-band and ultra-broadband MMAs based on vanadium dioxide (VO2) are proposed, with nearly no reduction in absorption during the tuning process. Simulations demonstrated that the proposed design can be switched between two independently designable multi-band frequency ranges, with the absorptivity being maintained above 99.8%. Moreover, via designing multiple adjacent absorption spectra, an ultra-broadband switchable MMA that maintains high absorptivity during the tuning process is also demonstrated. Raising the ambient temperature from 298 K to 358 K, the broadband absorptive range shifts from 1.194–2.325 THz to 0.398–1.356 THz, while the absorptivity remains above 90%. This method has potential for THz communication, smart filtering, detecting, imaging, and so forth.

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“…The controllable methods of tunable metamaterials are included thermal control, [ 37,38 ] optical pumping, [ 39–41 ] and micro/nano‐electro‐mechanical system (M/NEMS) control [ 42–44 ] to enhance their flexibilities. These tunable mechanisms can also be combined with the extra functional materials such as phase change materials, [ 37,45,46 ] liquid crystal, [ 47 ] superconductors, [ 48,49 ] 2D materials, [ 50–52 ] and flexible materials [ 53 ] to tune the electromagnetic characterizations including resonant frequency, transmission amplitude, perfect absorption, free spectrum range (FSR), bandwidth, and so on. These can largely improve the practicability of metamaterials in the cloaking, superlens, subwavelength imaging, holography, perfect absorber, sensor, filter, all‐optical modulation, programmable logic operation, nonlinear optics, and so on.…”

Section: Introductionmentioning

confidence: 99%

Tunable Dual‐Split‐Disk Resonator with Electromagnetically Induced Transparency Characteristic

Zheng

Lin

2020

Adv Materials Technologies

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A tunable dual‐split‐disk resonator (TDSDR) composed of top and bottom Au split‐disk resonators (SDRs) in the terahertz (THz) wave is presented. TDSDR exhibits electromagnetically induced transparency (EIT) characteristic by changing the rotation angle of top SDR (θ) and distance between top and bottom SDRs (h). The bright and dark modes are defined by the resonances with θ = 90° and 0°, respectively. The resonances could also be controlled by changing h values. It can generate a tunable sharp resonance by moving the top SDR to change h value. Furthermore, the amplitude of EIT resonance could be tuned and switched on/off state, i.e., bright and dark modes by rotating top SDR with specific h value. When h value is 1 µm, the free spectra range (FSR) could be tuned 0.24 THz and EIT characteristic is not clear. By continuously changing h value to 3 µm, EIT characteristic could be tuned with a modulation depth of 75.58%. The average quality factor (Q‐factor) of resonances is 11.54 and average figure of merit (FOM) is 7.06. When h value is enlarged to 5 µm, EIT characteristic could be tuned with a modulation depth of 62.73%, while the average Q‐factor is 14.50 and average FOM is 9.35.

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Large-scale, low-cost, broadband and tunable perfect optical absorber based on phase-change material

Abstract: We experimentally demonstrate a large-scale, low-cost, broadband, and tunable metamaterial absorber using phase change material. Based on two distinct resonance mechanisms, the device exhibits high absorptivity for both visible and near-IR lights.

Cited by 104 publications

References 43 publications

Ultra-broadband metamaterial absorbers from long to very long infrared regime

Ultra-broadband metamaterial absorbers from long to very long infrared regime

Demonstration of Thermally Tunable Multi-Band and Ultra-Broadband Metamaterial Absorbers Maintaining High Efficiency during Tuning Process

Tunable Dual‐Split‐Disk Resonator with Electromagnetically Induced Transparency Characteristic

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