Broadband Perfect Absorber with Monolayer MoS2 and Hexagonal Titanium Nitride Nano-disk Array

Huo, Dewang; Zhang, Jingwen; Wang, Hao; Ren, Xiaoxuan; Wang, Chao; Su, Hang; Zhao, Hua

doi:10.1186/s11671-017-2232-4

Cited by 51 publications

(18 citation statements)

References 47 publications

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“…Though the monolayer of transition metal dichalcogenides and periodic metal nano-groove array has a narrow bandwidth, it absorbs light in a wide angle [ 16 ]. In [ 17 ], monolayer MoS 2 is applied to titanium nitride nano-disk array, which achieves an average absorption of 98.1% in the band from 400 to 850 nm (72%).…”

Section: Introductionmentioning

confidence: 99%

Multi-functional Device with Switchable Functions of Absorption and Polarization Conversion at Terahertz Range

Peng

Xing

2018

Nanoscale Res Lett

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Terahertz electromagnetic (EM) wave components usually have a single function, such as they can only convert the polarization state of an incident wave or absorb the incident energy, which would be a limitation for their applications. To make a breakthrough, a multi-functional device (MFD) is proposed in this paper, and it is capable of switching between absorption mode and polarization conversion mode. The device has a low-profile and simple structure, and it is constructed by graphene-based absorbing metasurface (AM) and gold-based polarization conversion metasurface (PCM). By controlling the chemical potential (μc) of the graphene, the leading role is transferred between the AM and the PCM, which leads to steerable absorption and polarization conversion (PC) modes. For the PC mode, the simulated polarization conversion ratio (PCR) is larger than 0.9 in the 2.11–3.63-THz band (53.0% at 2.87 THz). For the absorption mode, the simulated absorptivity is larger than 80% in the 1.59–4.54-THz band (96.4% at 3.06 THz). The physical mechanisms and operating characteristics of the MFD are discussed. This research has potential applications in terahertz imaging, sensors, photodetectors, and modulators.

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Section: Introductionmentioning

confidence: 99%

Multi-functional Device with Switchable Functions of Absorption and Polarization Conversion at Terahertz Range

Peng

Xing

2018

Nanoscale Res Lett

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“…From the absorption spectra in Figure 4 b, the absorption spectrum is broadened with the bigger height, while the absorption at the long-wavelength edge decreases slightly in the studied range, with the redshift of the absorption peak. With the height 330 nm, the absorption exceeds an average of 99.6% from 400 nm to 1500 nm, which is much better than the previously reported absorption with TiN nanodisk arrays, averaging 98.1% from 400 nm to 850 nm [ 24 ].…”

Section: Resultsmentioning

confidence: 66%

“…The electric resonance excited by the incident electromagnetic field, which offers a leak channel for the incident light into the structure and reducing reflection as well. The reflectance reduction in the entire visible-to-NIR band is much better than nanodisk structures [ 24 ]. At the shorter wavelengths such as 400 nm, the electric resonances are excited in the base corner and the surface of the TiN nanocone, as shown in Figure 3 a, so the resonances offer two leak channels: into the TiN nanocone and into the gap.…”

Section: Resultsmentioning

confidence: 99%

“…Then, the absorber based on a TiN nanodisk array was studied with perfect absorption, from 400 nm to 700 nm [ 23 ]. Furthermore, with the hexagonal array and aluminum substrate, the absorption of TiN metamaterial absorber was broadened to a wider spectrum range from 400 nm to 850 nm with an average absorption of 98.1% [ 24 ]. Yet, the absorption band of the TiN nanodisk metamaterial absorber is not broad enough to cover the solar radiation spectrum as much as possible.…”

Section: Introductionmentioning

confidence: 99%

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Broadband Perfect Absorber Based on TiN-Nanocone Metasurface

et al. 2018

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Based on an integrated array of refractory titanium nitride (TiN), a metasurface perfect absorber (MPA) in the visible-to-near infrared (NIR) band is reported. The systematic and detailed simulation study of the absorption of the MPA is performed with the finite-different time-domain (FDTD) method. Tailoring the structure, the MPA realizes as high an average as 99.6% broadband absorption, ranging from 400 nm to 1500 nm. The broadband perfect absorption can be attributed to localized surface plasmonic resonance (LSPR), excited by the continuous diameter evolution from the apex to the base of the nanocone, and the gap plasmons excited among the nanocones, as well as in the spacer layer at longer wavelengths. Particularly, the coupling of the resonances is essentially behind the broadening of the absorption spectrum. We also evaluated the electric field intensity and polarization-dependence of the nanocone MPA to offer further physical insight into light trapping capability. The MPA shows about 90% average absorption even at an oblique incidence up to 50°, which improves the acceptance capability of light-harvesting system applications. This unique design with the TiN nanocone array/aluminium oxide (Al2O3)/TiN structure shows potential in imminent applications in light trapping and thermophotovoltaics.

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“…Moreover, injection of hot electrons from a plasmonic nanoantenna into a 2D semiconductor can be utilized for sub‐bandgap photodetection . These metallic nanoantennas can be replaced with highly ceramics, such as titanium nitride (TiN) …”

Section: Light Trapping Schemesmentioning

confidence: 99%

Semiconductor Thin Film Based Metasurfaces and Metamaterials for Photovoltaic and Photoelectrochemical Water Splitting Applications

Ghobadi

Özbay

2019

Advanced Optical Materials

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throughput and large-scale compatibility. The photoactive material is generally composed of single or multiple semiconductor layers responsible for harvesting solar energy. This harvested solar irradiation can be used to generate electricity using photovoltaic (PV) devices, or it can be converted to chemical energy in the form of hydrogen which is the case for photoelectrochemical water splitting (PEC-WS). In both PV and PEC-WS applications, the ultimate goal is to establish an efficient photon capturing and electron collecting scheme to generate a huge number of photocarriers (including electron-hole pairs) with rational carrier dynamics (efficient charge generation, separation, and collection). This means that the device should be optically thick enough to generate high carrier's density and electrically thin enough to collect photogenerated carrier before they recombine. When light impinges a semiconductor surface, a part of the light is reflected back due to the mismatch between the air and the semiconductor layer refractive index. The rest will propagate within the bulk until it is fully absorbed by the semiconductor slab. The optical penetration depth (LPD) is defined as the depth at which the incident power falls to 1/e (≈37%) of its input value. This parameter differs from one semiconductor to another and it depends on the extinction coefficient (κ) of the In both photovoltaic (PV) and photoelectrochemical water splitting (PEC-WS) solar conversion devices, the ultimate aim is to design highly efficient, low cost, and large-scale compatible cells. To achieve this goal, the main step is the efficient coupling of light into active layer. This can be obtained in bulkysemiconductor-based designs where the active layer thickness is larger than light penetration depth. However, most low-bandgap semiconductors have a carrier diffusion length much smaller than the light penetration depth. Thus, photogenerated electron-hole pairs will recombine within the semiconductor bulk. Therefore, an efficient design should fully harvest light in dimensions in the order of the carriers' diffusion length to maximize their collection probability. For this aim, in recent years, many studies based on metasurfaces and metamaterials were conducted to obtain broadband and near-unity light absorption in subwavelength ultrathin semiconductor thicknesses. This review summarizes these strategies in five main categories: light trapping based on i) strong interference in planar multilayer cavities, ii) metal nanounits, iii) dielectric units, iv) designed semiconductor units, and v) trapping scaffolds. The review highlights recent studies in which an ultrathin active layer has been coupled to the above-mentioned trapping schemes to maximize the cell optical performance.

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Broadband Perfect Absorber with Monolayer MoS2 and Hexagonal Titanium Nitride Nano-disk Array

Cited by 51 publications

References 47 publications

Multi-functional Device with Switchable Functions of Absorption and Polarization Conversion at Terahertz Range

Multi-functional Device with Switchable Functions of Absorption and Polarization Conversion at Terahertz Range

Broadband Perfect Absorber Based on TiN-Nanocone Metasurface

Semiconductor Thin Film Based Metasurfaces and Metamaterials for Photovoltaic and Photoelectrochemical Water Splitting Applications

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