Browsing by Author "Li, Jen Yung"

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Modal Analysis of Corrugated Plasmonic Rods for the Study of Field Localization, Conductor Attenuation, and Dielectric Losses
(2018-04-01)
Kehn, Malcolm Ng Mou
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Li, Jen Yung
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電機工程學系
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Department of Electrical and Computer Engineering
By virtue of the strong confinement of surface-wave fields that it provides, the transverse corrugated conducting rod is an important structure in the fields of plasmonics and meta-surfaces, finding applications in focusing, sensing, imaging, spectroscopy, and subwavelength optics, among others. This paper presents an analytical modal method for treating such grated rods with generally dielectric-filled grooves, one which offers rapid yet accurate surface-wave modal solutions. Based on the asymptotic corrugation boundary conditions, the formulation is simple and elegant, providing not only the dispersion relationship between the frequency and wavenumber but also the explicit functional forms of the fields. Dispersion and modal field results obtained by the proposed method are validated with an independent full-wave solver. Because of its candidacy for microwave applications at high powers and high frequencies, as well as transmissions over long distances, studies of dielectric and conductor losses are also carried out, for both the grooved rod and its likewise corrugated circular waveguide counterpart. Parametric studies are conducted on three aspects, namely, the degree of field localization on the surface of the rod, as well as attenuation due to dielectric and metal losses. Measurements of dispersion and field decay properties conducted on a manufactured rod that concur with theory are also reported.
The 90 degrees Rotating Eaton Lens Synthesized by Metasurfaces
(2018-07-01)
Li, Jen Yung
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Kehn, Malcolm Ng Mou
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電信工程研究所
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Institute of Communications Engineering
In this letter, the two-dimensional 90 degrees rotating Eaton lens is designed and realized by flat metasurfaces. Two kinds of unit-cell metallization are employed, namely the square patch and the mushroom structure, the latter adopted to achieve the higher values of equivalent refractive indices required by the regions near the center of the circular lens. Designs by computer simulations have demonstrated the successful bending of impingent waves by right angles, via field distributions over the metasurface as well as by simulated gains towards the rotated direction. A prototype of the design was also manufactured, the measured surface field distribution and far-field radiation gain patterns of which corroborate the theoretical prediction of the lens' ability to rotate waves by 90 degrees.