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Your search keyword '"Hou, Zhi-Ling"' showing total 335 results
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335 results on '"Hou, Zhi-Ling"'

15. High performance selective light absorber based on nickel nanopillar array for photothermal conversion.

Author

Cai, Jianing, Li, Linhao, Chen, Zhao, Zhang, Junying, and Hou, Zhi-Ling

Subjects
PHOTOTHERMAL conversion, PHOTOTHERMAL effect, SOLAR energy conversion, RADIATION absorption, SURFACE plasmon resonance, LIGHT absorption, EMISSIVITY
Abstract

Efficient absorption of solar radiation holds the key to photothermal utilization; however, realizing solar absorber designs with high absorption efficiency remains challenging. Herein, a nickel-based metamaterial selective solar absorber with a nanopillar array structure was proposed to realize nearly perfect optical absorption over a broad spectrum. The average absorbance is up to 96% in the 300–2033 nm wavelength range. Notably, a reasonably detailed analysis of the physical mechanism of the proposed absorber was performed in this paper, attributing the exceptional broadband absorption to the concurrent interaction with surface plasmon resonance, quarter-wavelength resonance, and electric dipole resonance. The absorption efficiency declines significantly when λ > 2.5 μm, with only 20% absorptivity at λ = 6 μm in the radiation-absorbing transition region. This decline is desirable, as it contributes to reducing the emissivity in the mid-infrared range and, therefore, prevents self-radiation. The results demonstrate that the selective absorber possesses the potential to capture solar energy within a broadband, while avoiding undesirable self-radiation, thereby enhancing the integral efficiency of the solar energy conversion system. Moreover, the absorption spectrum shows insensitivity to polarization and angle of incidence. The selective solar absorber proposed here offers excellent performance with a simple structure, showing great promise in the field of photothermal conversion. [ABSTRACT FROM AUTHOR]

Published
2023
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41. Highly tunable directional optical antennas with large local angular chiroptical effects.

Author

Wang, Yilin, Chen, Weijin, Li, Shilei, Hou, Zhi-Ling, and Yu, Li

Subjects
OPTICAL antennas, DIRECTIONAL antennas, GREEN'S functions, SPECTRAL sensitivity, MOMENTUM space, PLASMONICS
Abstract

The highly localized field of the plasmonic nanostructures can amplify the chiroptical effects. While most efforts have been focused on spectral responses in real space for chiroptical effects of the plasmonic nanostructures, we present alternative extrinsic chiroptical effects with respect to angular emission patterns in momentum space based on the designed directional nanoantennas. First, the chiroptical effects with respect to spectral responses for the antenna are investigated and decomposed based on the multipolar expansion method. Through the traditional spectral responses, there seems to be no chirality. However, when we turn to the angular emission patterns in the momentum space for the nanoantenna, large local angular chiroptical effects are observed. The chiroptical effects assessed by the difference of azimuth angle emission lobes under left- and right-circularly polarized light illumination can reach 180°. The multipolar analysis combined with Green's function method in a stratified medium is constructed to explain the unidirectional emission and chiral phenomenon, which agrees well with the simulation results. Moreover, the local angular chiroptical effects are also highly tunable by changing the refractive index of the surrounding medium. Our study on local angular chiroptical effects provides a new perspective to understand the chirality, and the large extrinsic chirality for the nanoantenna sheds a new light for biosensing and chiral photon detection. [ABSTRACT FROM AUTHOR]

Published
2022
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