| 1. |
- Ebadi, Seyed Morteza, et al.
(författare)
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Design of a tetra-band MIM plasmonic absorber based on triangular arrays in an ultra-compact MIM waveguide
- 2023
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Ingår i: Optical and quantum electronics. - : Springer Nature. - 0306-8919 .- 1572-817X. ; 55:6
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Tidskriftsartikel (refereegranskat)abstract
- This paper presents design and numerical investigations of an ultra-compact, and highly-efficient plasmonic absorber based on metal-insulator-metal waveguides. The proposed device offers multiple narrow-band absorption at visible and near-infrared wavelengths with peak absorbance between 81 and 100%. The finite element method has been used to simulate the proposed structure. The simulation results show that the resonance wavelengths can be easily modulated by tuning the coupling distances between the input and output ports and the triangular resonators. To find the optimized size of the proposed structure, maximize its efficiency, and attain narrow-band resonances, a parameterized genetic algorithm has been used. Taking into account the obtained notable specifications of the proposed structure, it can contribute to the development of miniaturized and efficient optical components for photonic integrated circuits.
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| 2. |
- Ebadi, Seyed Morteza, et al.
(författare)
-
Design of miniaturized wide band-pass plasmonic filters in MIM waveguides with tailored spectral filtering
- 2024
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Ingår i: Optical and quantum electronics. - : Springer Nature. - 0306-8919 .- 1572-817X. ; 56:5
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Tidskriftsartikel (refereegranskat)abstract
- This paper reports the design and numerical results of three new extremely compact and efficient flat-top band-pass plasmonic filters operating in the near-infrared region. The proposed structures are realized in metal–insulator-metal plasmonic waveguides based on stub, tilted T-junction and right-angle trapezoid configurations. A built-in parameterized genetic algorithm is applied to maximize the transmission efficiency, while at the same time contributing to shrinking down the size of the device structures. It is shown that the tunability of the optical filters can be realized by modulating their structural parameters to gain control over the band-pass filtering wavelengths. Numerical calculations are conducted based on the finite element method of CST Microwave Studio and demonstrate that the suggested ultra-compact plasmonic waveguide filters offer wide bandwidths of more than 270 nm, 424 nm, and 289 nm, with transmission efficiencies of higher than 80%, 74.2%, and 74.3%, respectively. The sizes of the proposed wavelength filters are 490 nm × 575 nm, 350 nm × 180 nm, and 420 nm × 150 nm, respectively, which make them attractive candidates for applications in high density photonic integrated circuits (PICs). As a result, because of the promising characteristics of the proposed topologies such as their high efficiency, compact size, tunability, and simple structure they may find applications in on-chip integration, laser technology, and multi-photon fluorescence.
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| 3. |
- Ebadi, Seyed Morteza, et al.
(författare)
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Highly-Miniaturized Nano-Plasmonic Filters Based on Stepped Impedance Resonators with Tunable Cut-Off Wavelengths
- 2023
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Ingår i: Plasmonics. - : Springer Nature. - 1557-1955 .- 1557-1963. ; 18:4, s. 1607-1618
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Tidskriftsartikel (refereegranskat)abstract
- This paper presents the design and numerical investigation of tunable, ultra-compact, and highly-efficient plasmonic filters based on stepped impedance resonators (SIRs). The proposed devices are realized in metal–insulator-metal (MIM) plasmonic waveguide systems and exhibit more degrees of freedom and high flexibility to design resonator-based devices, thanks to the SIRs. The principle of conventional SIRs is discussed in terms of equivalent circuit model and characteristic impedance. Among the three proposed plasmonic filters, one of them acts as a short-wavelength, while the other two nanostructures work as long-wavelength cut-off filters at near-infrared region (NIR) and telecom wavelengths. Simulation results are carried out by a finite element method (FEM)-based solver and indicate that the cut-off wavelengths of the proposed resonators found to be at 1187 nm, 1265 nm, and 999 nm, respectively, can be easily tuned by modulating their structural parameters. In addition to the mentioned remarkable properties of the designed structures including the size which are found to be 500 nm × 310 nm, 350 nm × 285 nm, and 210 nm × 195 nm, respectively, the simple structures of the proposed topologies facilitate their fabrication process. Therefore, the suggested devices can contribute to the development of miniaturized, tunable, and efficient optical components for photonic integrated circuits (PICs) applications and in optical wireless communication systems.
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