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Enhanced properties of indium thin films by stacking with platinum nanosheets designed for advanced terahertz/gigahertz applications

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Abstract

Herein stacked layers of metallic indium (150 nm) and platinum (50–250 nm) thin films are fabricated as a terahertz/gigahertz filters. Indium thin films are produced by the thermal evaporation technique under a vacuum pressure of 10− 5 mbar and coated with Pt nanosheets using the ionic coating technique. It is observed that Pt nanosheets increased the light transmittance and reflectance in In/Pt films. In/Pt stacked layers displayed lower; dielectric constant, optical conductivity and terahertz cutoff frequency values as compared indium thin slabs. In/Pt stacked layers is found appropriate as tunable terahertz filters. In addition, the Drude-Lorentz analyses on these optical layers have shown that In/Pt stacks exhibit plasmon frequency values (8.7–17.3 GHz) that make them suitable for 5G/6G technology as band filters. The optical conductivity parameters including the drift mobility, free electron density and scattering time at femtosecond level are also determined. As a confirming technique an ac signals propagating with driving frequency in the range of 0.01–0.50 GHz is imposed between the terminals of In/Pt stacked layers. It is shown that the microwave cutoff frequency is widely tunable achieving values of 40 GHz at driving frequency of 0.50 GHz. The features of the In/Pt stacked layers are promising as they show properties of tunable terahertz/gigahertz filters.

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The data that support the findings of this study are available from the corresponding author upon reasonable request.

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Acknowledgements

The authors gratefully acknowledge the technical and financial support provided by the Ministry of Education and King Abdulaziz University, DSR, Jeddah, Saudi Arabia.

Funding

This research work was funded by Institutional Fund Projects under Grant No. IFPIP:1454-665-1443. The authors gratefully acknowledge the technical and financial support provided by the Ministry of Education and King Abdulaziz University, DSR, Jeddah, Saudi Arabia.

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Authors and Affiliations

  1. Department of Physics, College of Science and Art, King Abdulaziz University, Rabigh, Saudi Arabia

    R. A. Almotiri

  2. Department of Physics, Arab American University, Jenin, Palestine

    A. F. Qasrawi

  3. Department of Electrical and Electronics Engineering, Istinye University, 34010, Istanbul, Turkey

    A. F. Qasrawi

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  1. R. A. Almotiri
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Contributions

RAA have shared in the review article collection, wins the fund, analyzed the X-ray data and calculated respective parameters. She also calculated the data in Fig. 4a and made Tauc’s equation fitting. She determined the energy band gaps and calculated the dielectric constant. AFQ guided the work, measured the data and analyzed or shared analyses of the data in Figs. 1 and 2. He carried out the computational analyses and edited the article.

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Correspondence to A. F. Qasrawi.

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Almotiri, R.A., Qasrawi, A.F. Enhanced properties of indium thin films by stacking with platinum nanosheets designed for advanced terahertz/gigahertz applications. Opt Quant Electron 55, 478 (2023). https://doi.org/10.1007/s11082-023-04752-6

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