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Hybrid Ag-LiNbO₃ nanocomposite thin films with tailorable optical properties.

ABSTRACT: Ag nanostructures exhibit extraordinary optical properties, which are important for photonic device integration. Herein, we deposited Ag-LiNbO₃ (LNO) nanocomposite thin films with Ag nanoparticles (NPs) embedded into the LNO matrix by the co-deposition of Ag and LNO using a pulsed laser deposition (PLD) method. The density and size of Ag NPs were tailored by varying the Ag composition. Low-density and high-density Ag-LNO nanocomposite thin films were deposited and their optical properties, such as transmittance spectra, ellipsometry measurement, as well as angle-dependent and polarization-resolved reflectivity spectra, were explored. The Ag-LNO films show surface plasmon resonance (SPR) in the visible range, tunable optical constants and optical anisotropy, which are critical for photonic device applications.

SUBMITTER: Huang J

PROVIDER: S-EPMC9417351 | biostudies-literature | 2021 Feb

REPOSITORIES: biostudies-literature

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Hybrid Ag-LiNbO<sub>3</sub> nanocomposite thin films with tailorable optical properties.

Huang Jijie J Zhang Di D Qi Zhimin Z Zhang Bruce B Wang Haiyan H

Nanoscale advances 20201228 4

Ag nanostructures exhibit extraordinary optical properties, which are important for photonic device integration. Herein, we deposited Ag-LiNbO<sub>3</sub> (LNO) nanocomposite thin films with Ag nanoparticles (NPs) embedded into the LNO matrix by the co-deposition of Ag and LNO using a pulsed laser deposition (PLD) method. The density and size of Ag NPs were tailored by varying the Ag composition. Low-density and high-density Ag-LNO nanocomposite thin films were deposited and their optical proper ...[more]

PMID: 36133298

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Project description:Fenestration elements that enable spectrally selective dynamic modulation of the near-infrared region of the electromagnetic spectrum are of great interest as a means of decreasing the energy consumption of buildings by adjusting solar heat gain in response to external temperature. The binary vanadium oxide VO2 exhibits a near-room-temperature insulator-metal electronic transition accompanied by a dramatic modulation of the near-infrared transmittance. The low-temperature insulating phase is infrared transparent but blocks infrared transmission upon metallization. There is considerable interest in harnessing the thermochromic modulation afforded by VO2 in nanocomposite thin films. However, to prepare a viable thermochromic film, the visible-light transmittance must be maintained as high as possible while maximizing thermochromic modulation in the near-infrared region of the electromagnetic spectrum, which necessitates the development of high-crystalline-quality VO2 nanocrystals of the optimal particle size embedded within the appropriate host matrix and refractive index matched to the host medium. Here, we demonstrate the preparation of acrylate-based nanocomposite thin films with varying sizes of embedded VO2 nanoparticles. The observed strong size dependence of visible-light transmittance and near-infrared modulation is explicable on the basis of optical simulations. In this article, we elucidate multiple scattering and absorption mechanisms, including Mie scattering, temperature-/phase-variant refractive-index mismatch between VO2 nanocrystals and the encapsulating matrix, and the appearance of a surface plasmon resonance using temperature-variant absorptance and diffuse transmittance spectroscopy measurements performed as a function of particle loading for the different sizes of VO2 nanocrystals. Nanocrystals with dimensions of 44 ± 30 nm show up to >32% near-infrared energy modulation across the near-infrared region of the electromagnetic spectrum while maintaining high visible-light transmission. The results presented here, providing mechanistic elucidation of the size dependence of the different scattering mechanisms, underscore the importance of nanocrystallite dimensions, refractive-index matching, and individualized dispersion of particles within the host matrix for the preparation of viable thermochromic thin films mitigating Mie scattering and differential refractive-index scattering.

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Hybrid Ag-LiNbO₃ nanocomposite thin films with tailorable optical properties.

Publications

Hybrid Ag-LiNbO<sub>3</sub> nanocomposite thin films with tailorable optical properties.

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Dataset Information

Hybrid Ag-LiNbO3 nanocomposite thin films with tailorable optical properties.

Publications

Hybrid Ag-LiNbO<sub>3</sub> nanocomposite thin films with tailorable optical properties.

Similar Datasets

OmicsDI is part of the ELIXIR infrastructure

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Hybrid Ag-LiNbO₃ nanocomposite thin films with tailorable optical properties.