Sub-nanograin metal based high efficiency multilayer reflective optics for high energies

Majhi, A.; Nayak, M.; Pradhan, P. C.; Jena, S.; Gome, Anil; Singh, M. N.; Srivastava, Himanshu; Reddy, V. R.; Srivastava, Arvind K.; Sinha, A. K.; Udupa, D. V.; Pietsch, U.

doi:10.1039/d1ra04412e

Cited by 5 publications

(1 citation statement)

References 47 publications

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“…For NLs with reducing t s from 0.8 to 0.5 nm, the XRR fitting revealed an increased sublayer roughness to thickness ratio from 0.6 to 0.98, leading toward porous and quasi-continuous/discontinuous layer growth. 42,43 This observation is confirmed with the reduction in Bragg peak intensity and broadening of Bragg peaks as shown in Figure 2a. Enhanced broadening of the Bragg peak for NL with t s ∼ 0.6 nm indicated significant intermixing of sublayers across interfaces, which will lead to the formation of an AlTiO x interfacial layer.…”

Section: Resultssupporting

confidence: 75%

Maxwell–Wagner Relaxation-Driven High Dielectric Constant in Al₂O₃/TiO₂ Nanolaminates Grown by Pulsed Laser Deposition

Padhi

Kumar

Srivastava

et al. 2022

ACS Appl. Mater. Interfaces

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Multilayer nanolaminates (NLs) of alternate ultrathin sublayers of Al2O3 and TiO2 (ATA) with the thickness ranging ∼2 to 0.5 nm were fabricated by optimized pulsed laser deposition (PLD). Maxwell–Wagner (M–W) relaxation-induced interfacial polarization was realized and engineered by precisely controlling the sublayer thicknesses and the number of interfaces. X-ray reflectivity and cross-sectional transmission electron microscopy measurements of ATA NLs revealed an artificial periodicity with well-defined uniformly thick amorphous sublayers with chemically and physically distinct interfaces down to a sublayer thickness of ∼0.8 nm. The dielectric constants and loss of ATA NLs were found to increase from ∼60 to 670 and decrease from ∼0.9 to 0.16, respectively, as sublayer thicknesses reduced from ∼2 to 0.8 nm. However, for a sublayer thickness below 0.8 nm, the trend was reversed. Furthermore, temperature-dependent impedance spectroscopy studies revealed two distinct thermally activated relaxation processes, corresponding to TiO2 and Al2O3 sublayers, corroborating the M–W relaxation. The conductivity contrast between the sublayers of ATA NLs enhanced with reducing sublayer thickness and plateaued at a sublayer thickness of ∼0.8 nm, resulting in dominant M–W interfacial polarization and a high cut-off frequency of ∼50 kHz. These results demonstrate that ATA NLs grown by PLD may find application as potential high-k materials for next-generation nanoelectronic devices.

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Section: Resultssupporting

confidence: 75%

Maxwell–Wagner Relaxation-Driven High Dielectric Constant in Al₂O₃/TiO₂ Nanolaminates Grown by Pulsed Laser Deposition

Padhi

Kumar

Srivastava

et al. 2022

ACS Appl. Mater. Interfaces

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Linear and non-linear optical properties of boron carbide thin films

Bute

Jena²,

Sharma³

et al. 2023

Applied Surface Science

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Investigation of microstructure and reflectivity of thermally annealed Mo/Be and W/Be multilayer mirrors

Kumar

Плешков

Гарахин

et al. 2022

Surfaces and Interfaces

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Sub-nanograin metal based high efficiency multilayer reflective optics for high energies

Abstract: The present finding illuminates the physics of the formation of interfaces of metal based hetero-structures near layer continuous limit as an approach to develop high-efficiency W/B4C multilayer optics with varying periods at a fixed large layer pairs.

Cited by 5 publications

References 47 publications

Maxwell–Wagner Relaxation-Driven High Dielectric Constant in Al₂O₃/TiO₂ Nanolaminates Grown by Pulsed Laser Deposition

Maxwell–Wagner Relaxation-Driven High Dielectric Constant in Al₂O₃/TiO₂ Nanolaminates Grown by Pulsed Laser Deposition

Linear and non-linear optical properties of boron carbide thin films

Investigation of microstructure and reflectivity of thermally annealed Mo/Be and W/Be multilayer mirrors

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Sub-nanograin metal based high efficiency multilayer reflective optics for high energies

Abstract: The present finding illuminates the physics of the formation of interfaces of metal based hetero-structures near layer continuous limit as an approach to develop high-efficiency W/B4C multilayer optics with varying periods at a fixed large layer pairs.

Cited by 5 publications

References 47 publications

Maxwell–Wagner Relaxation-Driven High Dielectric Constant in Al2O3/TiO2 Nanolaminates Grown by Pulsed Laser Deposition

Maxwell–Wagner Relaxation-Driven High Dielectric Constant in Al2O3/TiO2 Nanolaminates Grown by Pulsed Laser Deposition

Linear and non-linear optical properties of boron carbide thin films

Investigation of microstructure and reflectivity of thermally annealed Mo/Be and W/Be multilayer mirrors

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Product

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Maxwell–Wagner Relaxation-Driven High Dielectric Constant in Al₂O₃/TiO₂ Nanolaminates Grown by Pulsed Laser Deposition

Maxwell–Wagner Relaxation-Driven High Dielectric Constant in Al₂O₃/TiO₂ Nanolaminates Grown by Pulsed Laser Deposition