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

Autor: R. A. Almotiri, A. F. Qasrawi
Přispěvatelé: İstinye Üniversitesi, Mühendislik ve Doğa Bilimleri Fakültesi, Elektrik-Elektronik Mühendisliği Bölümü, Atef Fayez Qasrawi / 0000-0001-8193-6975, Qasrawi, Atef Fayez, Atef Fayez Qasrawi / R-4409-2019, Atef Fayez Qasrawi / 6603962677
Rok vydání: 2023
Předmět:
Zdroj: Optical and Quantum Electronics. 55
ISSN: 1572-817X
0306-8919
DOI: 10.1007/s11082-023-04752-6
Popis: 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.
Databáze: OpenAIRE
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