LaGe2 Thin Films Designed as Band Filters for 6G Communication Technology

Alfhaid, Latifah; Qasrawi, A.F.

doi:10.1007/s11664-023-10554-z

J. Electron. Mater.

2023

DOI: 10.1007/s11664-023-10554-z

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LaGe2 Thin Films Designed as Band Filters for 6G Communication Technology

Latifah Alfhaid

A.F. Qasrawi

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2024

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Cited by 3 publications

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Enhanced Performance of Fe/WO₃ Terahertz Dielectric Lenses

Khanfar,

Qasrawi

2024

Cryst. Res. Technol.

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Herein transparent iron nanosheets deposited by the ionic coating technique onto glass and WO3 dielectric lenses are studied and characterized. The thickness of Fe nanosheets is varied in the range of 70–350 nm. It is observed that the transmittance and reflectance of the Fe nanosheets are highly affected by the layer roughness. Coating of iron nanosheets onto WO3 dielectric lenses increases the light absorption of WO3 by more than 240 times and red‐shifts the energy bandgap. Remarkable enhancements in the dielectric constant and in the optical conductivity are achieved via Fe coatings. In addition, iron coated dielectric lenses show higher terahertz cutoff limits varying in the range of 1.0–30 THz. Iron nanosheets remarkably increase the free charge carrier density and plasmon frequency in the infrared range of light. Moreover, the temperature dependent electrical conductivity shows high temperature stability and an increased electrical conductivity by more than 7 orders of magnitude by coating WO3 with 70 nm thick Fe nanosheets. The stability of the electrical conductivity at low temperatures and the wide range of terahertz cutoff limits in addition to the well‐enhanced light absorbability makes the iron coated tungsten oxide dielectric lenses promising for multifunction optoelectronic applications.

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Enhanced Performance of Fe/WO₃ Terahertz Dielectric Lenses

Khanfar,

Qasrawi

2024

Cryst. Res. Technol.

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Enhanced Quad‐Band WO₃ Antennas with 1.46 THz Cutoff Frequency via Indium Nanosheets between Stacked Layers

Altaiary,

Qasrawi,

Alharbi

2024

Physica Status Solidi (a)

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Herein, stacked films of WO3 separated by indium nanosheets are fabricated as quad‐band antennas suitable for high‐frequency applications. The amorphous WO3 films and indium nanosheets are coated onto each other using the thermal evaporation technique under a high vacuum pressure of 10−5 mbar. The stacked layers of Pt/WO3/In/WO3/Pt are structurally and electrically characterized. The tunneling‐type quad‐band antennas are tested in the driving frequency domain of 0.01–1.80 GHz and a low signal amplitude of 0.10 V. It is observed that the insertion of indium nanosheets between layers of WO3 remarkably increases the width of the tunneling barrier from 55 to 70 nm without altering the tunneling barrier height. This also enhances the cutoff frequency at a quad‐band frequency of 1.80 GHz from 10 GHz to 1.46 THz and increases the return loss values from ≈5 to 21 dB. A widely tunable cutoff frequency extending from 0.30 GHz to 1.46 THz can be obtained based on the selected driving signal frequency. The microwave‐controlling features of the Pt/WO3/In/WO3/Pt devices, with their high cutoff frequency and high power transmission ratios at the quad‐band frequency, make them attractive for 6G technology.

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Thermal annealing effects on the structural and electrical properties of Ag2La thin films deposited by thermal evaporation technique

Qasrawi,

Zakarneh

2024

DJNB

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Herein Ag2La thin films are fabricated by a vacuum coating method and subjected to a thermal annealing process. The thermally heated of films at 200 o C increased the crystallite sizes and improved the crystalline structure of the films. For these films the electrical conductivity measurements which were handled in the temperature range of 300- 440 K. The conductivity analyses indicated that the transport of charged particles is dominated by the thermionic emission and by the variable range hopping conduction mechanisms. The annealing of films shifted the impurity levels and decreased; the degree of disorder, the average hopping distance and the average hopping energy.

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LaGe2 Thin Films Designed as Band Filters for 6G Communication Technology

Cited by 3 publications

References 32 publications

Enhanced Performance of Fe/WO₃ Terahertz Dielectric Lenses

Enhanced Performance of Fe/WO₃ Terahertz Dielectric Lenses

Enhanced Quad‐Band WO₃ Antennas with 1.46 THz Cutoff Frequency via Indium Nanosheets between Stacked Layers

Thermal annealing effects on the structural and electrical properties of Ag2La thin films deposited by thermal evaporation technique

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LaGe2 Thin Films Designed as Band Filters for 6G Communication Technology

Cited by 3 publications

References 32 publications

Enhanced Performance of Fe/WO3 Terahertz Dielectric Lenses

Enhanced Performance of Fe/WO3 Terahertz Dielectric Lenses

Enhanced Quad‐Band WO3 Antennas with 1.46 THz Cutoff Frequency via Indium Nanosheets between Stacked Layers

Thermal annealing effects on the structural and electrical properties of Ag2La thin films deposited by thermal evaporation technique

Contact Info

Product

Resources

About

Enhanced Performance of Fe/WO₃ Terahertz Dielectric Lenses

Enhanced Performance of Fe/WO₃ Terahertz Dielectric Lenses

Enhanced Quad‐Band WO₃ Antennas with 1.46 THz Cutoff Frequency via Indium Nanosheets between Stacked Layers