Cutoff frequency in metamaterials photonic crystals within Terahertz frequencies

Aly, Arafa H.; Sabra, Walied; Elsayed, Hussein A.

doi:10.1142/s0217979217501235

Cited by 55 publications

(12 citation statements)

References 19 publications

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“…These values are crucial for thin film devices used in terahertz data transmission, as they align with the requirements of 6G technology, operating in the spectral range of 100 GHz to 30 THz. [22,41,42] In order to obtain detailed information about the optical conductivity parameters of the La 6 Ge films as terahertz filters the imaginary part is modeled using Drude-Lorentz approaches for optical conduction. The model is summarized by the equations [26] 𝜀…”

Section: Resultsmentioning

confidence: 99%

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Growth and Characterization of Lanthanum Germanide Thin Films by the Thermal Evaporation Technique

Alkhamisi

Qasrawi

Khanfar

2023

Cryst. Res. Technol.

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Lanthanum germanide (La6Ge) thin films are successfully fabricated using the thermal evaporation technique under a vacuum pressure of 10−5 mbar. The resulting films display an orthorhombic structure, characterized by lattice parameters of a = 8.725 Å, b = 8.063 Å, and c = 5.569 Å. Optical analysis of the La6Ge thin films reveal their high transparency, with an energy bandgap of 3.75±0.04 eV. The bandgap exhibits indirect allowed transitions and featured energy band tails with widths measuring (1.64±0.14) eV. In addition, dielectric dispersion analyses indicate the presence of two dominant dielectric resonance peaks centered at 3.15 and 2.08 eV. Moreover, the La6Ge films demonstrate a terahertz (THz) cutoff frequency of 1.0 THz when illuminated with infrared and visible light. This cutoff frequency increases to 45.6 THz in the ultraviolet range. Furthermore, by utilizing the Drude–Lorentz method, the investigation of optical conductivity parameters reveals that the lanthanum germanide optical filters can achieve free hole density and drift mobility values of 14.44 cm2 V−1 s−1 and 2.8×1018 cm−3, respectively, under infrared light irradiation. The outstanding optical and dielectric properties exhibited by the La6Ge thin films make them excellent candidates for highly transparent optical filters suitable for terahertz technology.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Growth and Characterization of Lanthanum Germanide Thin Films by the Thermal Evaporation Technique

Alkhamisi

Qasrawi

Khanfar

2023

Cryst. Res. Technol.

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“…5 A–D, respectively. Because the Ag-NPs increase, the amplitude of the oscillation outside PBG increases as well 55 . Moreover, the width of the PBG increases to 1.63 and 1.73 GHz as shown in Figs.…”

Section: Resultsmentioning

confidence: 99%

Transmittance properties of one-dimensional metamaterial nanocomposite photonic crystal in GHz range

Mohamed

El-Sayed

Mehaney

et al. 2022

Sci Rep

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We have theoretically demonstrated and explored the transmittance characteristics of a one-dimensional binary photonic crystal composed of metamaterial (MM) and nanocomposite (NC) layers. The NC layer was designed from silver nanoparticles (Ag-NPs) in a host material as Yttrium oxide (Y2O3). Using the transfer matrix approach (TMM), the optical properties of a one-dimensional binary periodic structure having MM and NC layers in the Giga Hertz (GHz) range were examined. The filling fractions of nanoparticles have been explored to see their effect on the effective permittivity of NC materials. Furthermore, the transmittance properties of the suggested structure were investigated at various incident angles for the transverse electric (TE) polarization. In addition to that, different parameters, such as the thickness of the MM layer, the permittivity of the host dielectric material, the filling fraction, and the thickness of the NC layer are also taken into account. We also discussed the effect of these parameters on the width of the photonic bandgap (PBG). With the optimum values of the optical parameters of NC layer, this research could open the way for better photonic crystal circuits, splitters, switches and others.

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“…From the optical techniques, the most popular one is the photonic crystal periodic structure. [7][8][9][10][11][12] Photonic crystals (PCs) have the possibility to control the electromagnetic waves propagation with different frequencies. One of the most important features which exhibited by the PC designs is the photonic band gap (PBG).…”

Section: Introductionmentioning

confidence: 99%

Photonic crystal nanostructure as a photodetector for NaCl solution monitoring: theoretical approach

et al. 2023

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Cutoff frequency in metamaterials photonic crystals within Terahertz frequencies

Cited by 55 publications

References 19 publications

Growth and Characterization of Lanthanum Germanide Thin Films by the Thermal Evaporation Technique

Growth and Characterization of Lanthanum Germanide Thin Films by the Thermal Evaporation Technique

Transmittance properties of one-dimensional metamaterial nanocomposite photonic crystal in GHz range

Photonic crystal nanostructure as a photodetector for NaCl solution monitoring: theoretical approach

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