Effect of Yagi–Uda nano-antenna element shape on the directivity and radiation efficiency

Helmy, Fatma E.; Hussein, Mohamed; Hameed, Mohamed Farhat O.; Shaker, Ahmed; Eladawy, Mohamed; Obayya, S. S. A.

doi:10.1007/s11082-019-1774-3

Cited by 6 publications

(12 citation statements)

References 30 publications

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“…4(b), 4(c), the hexagonal patch NA achieved a gain of 9.02 dBi, which is higher than the rectangular patch NA. This improvement results from the change in the geometrical parameters that more corners are being used [14], [15], and [41]. On the other hand, the radiation pattern characteristic is improved with the elliptical patch NA with a gain reach to 10.7 dBi due to the homogeneous distribution of the supported eld intensity compared to 8.4 dBi for rectangular Si-patch NA.…”

Section: Simulated Results and Discussionmentioning

confidence: 99%

“…Different materials have been used in the optical NA such as dielectric [13][14][15], metallic [16,17], or hybrid materials [18][19][20][21]. Silicon has gained signi cant attention as a dielectric material in various applications such as point-to-point communications and solar cells due to its low cost and abundant fabrication process [22].…”

Section: Introductionmentioning

confidence: 99%

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Beam-steering of Dielectric Flat Lens Nanoantenna with Elliptical Patch based on Antenna Displacement for Optical Wireless Applications

Helmy

Ibrahim

Saleh

2023

Preprint

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In this paper, the switched-beam nanoantenna (NA) concept is introduced with a theoretical design of an inhomogeneous dielectric flat lens modelled with different materials to steer and enhance the radiation in a particular direction based on shifting the illuminator element. Firstly, the design of hybrid plasmonic NA is introduced and analyzed considering different silicon patch shapes such as rectangular, circular, hexagonal, and elliptical shapes. The elliptical patch NA achieves a gain of up to 10.7 dBi and a return loss of -14.41 dB. Then the design of a gradient-index dielectric flat lens with the NA is introduced to improve the antenna performance by increasing the directivity and consequently decreasing the beam-width. Furthermore, the beam-steering capabilities by displacement of the NA according to different feeding points along the X and Y-direction. By using the gradient-index dielectric flat lens, the gain is increased to 18.4 dBi with an improvement in the return loss reach to -19.15 dB compared with traditional NA. In addition, the beam-steering capabilities were achieved with a range ± 60° × ±55° with acceptable average antenna gain, side-lobe levels, and half power beam-width of 16.5 dBi, -12.3 dB and 13.6° respectively.

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Section: Simulated Results and Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Beam-steering of Dielectric Flat Lens Nanoantenna with Elliptical Patch based on Antenna Displacement for Optical Wireless Applications

Helmy

Ibrahim

Saleh

2023

Preprint

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“…The normalized scattered field profiles along the elevation plane (i.e., the

-plane) are shown in Figure 8 b–d, which indicates that the best front-to-back ratio, with the best signal transmission towards the front of the antenna, corresponds to Case 3. Compared with other strategies to design plasmonic Yagi–Uda nanoantennas with spherical [ 38 ], ribs [ 37 ], or different shapes [ 17 ], the concept in this work offers a mechanism for improved directivity in optical wireless nanolinks through a simple, feasible, and easily implementable design.…”

Section: Results and Discussionmentioning

confidence: 99%

“…Such integration uses plasmonic nanoantennas in two different, yet complementary ways: (i) the unique ability of plasmonic nanoantennas to localize electromagnetic fields into deep subwavelength regions is used for direct integration of high-frequency wireless signals into Photonic-Integrated Circuits (PICs) [ 13 , 14 ]; (ii) the radiative properties of plasmonic nanoantennas is exploited for high-speed and broadband nanoscale wireless communication networks, surpassing the intrinsic Ohmic losses of plasmonic waveguides (reducing heating and, consequently, improving power consumption) through reduced light–matter interactions [ 15 , 16 ]. Significantly, this last feature enables PICs with unprecedented miniaturization levels [ 17 ]. Furthermore, these nanoantennas can be excited by different mechanisms, namely direct light incidence on the structure [ 18 ], electrical excitation/tunability [ 19 , 20 ], guided mode excitation [ 21 , 22 , 23 ], and the excitation by self-assembled quantum dots [ 24 ].…”

Section: Introductionmentioning

confidence: 99%

“…Among all these previous approaches, the Yagi–Uda model stands out for its extraordinary gain and high front-to-back ratio (unidirectional radiation) of the radiated beam. Nevertheless, a general (or optimized) design strategy for Yagi–Uda-like nanoantennas is lacking, i.e., each research group uses its own different design rule for this nanoantenna model [ 17 , 37 , 38 ]. Over the last years, some approaches to design Yagi–Uda nanoantennas have been proposed.…”

Section: Introductionmentioning

confidence: 99%

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Design of Plasmonic Yagi–Uda Nanoantennas for Chip-Scale Optical Wireless Communications

Damasceno

Carvalho

Mejía‐Salazar

2022

Sensors

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Optical wireless transmission has recently become a major cutting-edge alternative for on-chip/inter-chip communications with higher transmission speeds and improved power efficiency. Plasmonic nanoantennas, the building blocks of this new nanoscale communication paradigm, require precise design to have directional radiation and improved communication ranges. Particular interest has been paid to plasmonic Yagi–Uda, i.e., the optical analog of the conventional Radio Frequency (RF) Yagi–Uda design, which may allow directional radiation of plasmonic fields. However, in contrast to the RF model, an overall design strategy for the directional and optimized front-to-back ratio of the radiated far-field patterns is lacking. In this work, a guide for the optimized design of Yagi–Uda plasmonic nanoantennas is shown. In particular, five different design conditions are used to study the effects of sizes and spacing between the constituent parts (made of Au). Importantly, it is numerically demonstrated (using the scattered fields) that closely spaced nanoantenna elements are not appropriated for directional light-to-plasmon conversion/radiation. In contrast, if the elements of the nanoantenna are widely spaced, the structure behaves like a one-dimensional array of nanodipoles, producing a funnel-like radiation pattern (not suitable for on-chip wireless optical transmission). Therefore, based on the results here, it can be concluded that the constituent metallic rib lengths must be optimized to exhibit the resonance at the working wavelength, whilst their separations should follow the relation λeff/π, where λeff indicates the effective wavelength scaling for plasmonic nanostructures.

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Beam-steering of dielectric flat lens nanoantenna with elliptical patch based on antenna displacement for optical wireless applications

Helmy,

Ibrahim,

Saleh

2023

Sci Rep

Self Cite

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In this paper, the switched-beam nanoantenna (NA) concept is introduced with a theoretical design of an inhomogeneous dielectric flat lens modelled with different materials to steer and enhance the radiation in a particular direction based on shifting the illuminator element. Firstly, the design of hybrid plasmonic NA is introduced and analyzed considering different silicon patch shapes such as rectangular, circular, hexagonal, and elliptical shapes. The elliptical patch NA achieves a gain of up to 10.7 dBi and a return loss of − 14.41 dB. Then the design of a gradient-index dielectric flat lens with the NA is introduced to improve the antenna performance by increasing the directivity and consequently decreasing the beam-width. Furthermore, the beam-steering capabilities by displacement of the NA according to different feeding points along the X and Y-direction. By using the gradient-index dielectric flat lens, the gain is increased to 18.4 dBi with an improvement in the return loss reach to − 19.15 dB compared with traditional NA. In addition, the beam-steering capabilities were achieved with a range ± 60° × ± 55° with acceptable average antenna gain, side-lobe levels, and half power beam-width of 16.5 dBi, − 12.3 dB and 13.6° respectively.

show abstract

Effect of Yagi–Uda nano-antenna element shape on the directivity and radiation efficiency

Cited by 6 publications

References 30 publications

Beam-steering of Dielectric Flat Lens Nanoantenna with Elliptical Patch based on Antenna Displacement for Optical Wireless Applications

Beam-steering of Dielectric Flat Lens Nanoantenna with Elliptical Patch based on Antenna Displacement for Optical Wireless Applications

Design of Plasmonic Yagi–Uda Nanoantennas for Chip-Scale Optical Wireless Communications

Beam-steering of dielectric flat lens nanoantenna with elliptical patch based on antenna displacement for optical wireless applications

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