Revealing topology with transformation optics [PDF]
Nature Communications, 2021 Visualizing and studying topological features is becoming crucial to develop new generation topological systems. Here the authors provide the theoretical and numerical demonstration of the potential of transformation optics connecting the virtual space ...
Lizhen Lu +5 more
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Mirrored Transformation Optics [PDF]
Optics Letters, 2023 A mirrored transformation optics (MTO) approach is presented to overcome the material mismatch in transformation optics. It makes good use of the reflection behavior and introduces a mirrored medium to offset the phase discontinuities.
Junke Liao +4 more
semanticscholar +6 more sources
Merging transformation optics with electron-driven photon sources [PDF]
Nature Communications, 2019 There is growing interest in designing platforms for coherent electron-driven photon sources for hybrid light and electron spectroscopy. Here the authors demonstrate generation of coherent broadband ultrashort light pulses upon electron irradiation to ...
Nahid Talebi +6 more
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Broadband wide-angle terahertz antenna based on the application of transformation optics to a Luneburg lens [PDF]
Sci Rep, 2021 The design of antennas for terahertz systems remains a significant challenge. These antennas must provide very high gain to overcome significant free-space path loss, which limits their ability to broadcast or receive a beam over a wide angular range. To
Yasith Amarasinghe +6 more
semanticscholar +2 more sources
H-plane horn antenna with enhanced directivity using conformal transformation optics [PDF]
Sci Rep, 2021 Conformal transformation optics is employed to enhance an H-plane horn’s directivity by designing a graded-index all-dielectric lens. The transformation is applied so that the phase error at the aperture is gradually eliminated inside the lens, leading ...
Hossein Eskandari +4 more
semanticscholar +2 more sources
3D-Printing for Transformation Optics in Electromagnetic High-Frequency Lens Applications [PDF]
Materials (Basel), 2020 This article presents the design, construction and analysis of a 3D-printed transformed hyperbolic flat lens working on the 30 GHz band. The transformed lens was printed using only one ABS dielectric filament of relative permittivity of 12, varying the ...
José-Manuel Poyanco +2 more
semanticscholar +2 more sources
Wide-Angle Ceramic Retroreflective Luneburg Lens Based on Quasi-Conformal Transformation Optics for Mm-Wave Indoor Localization [PDF]
IEEE Access, 2022 This paper presents a quasi-conformal transformation optics (QCTO) based three-dimensional (3D) retroreflective flattened Luneburg lens for wide-angle millimeter-wave radio-frequency indoor localization.
Petr Kaděra +9 more
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Multiplication and division of the orbital angular momentum of light with diffractive transformation optics [PDF]
Light Sci Appl, 2019 We present a method to efficiently multiply or divide the orbital angular momentum (OAM) of light beams using a sequence of two optical elements. The key element is represented by an optical transformation mapping the azimuthal phase gradient of the ...
G. Ruffato, M. Massari, F. Romanato
semanticscholar +2 more sources
Aberration corrections for quasi-conformal transformation optics-based reflectors [PDF]
Scientific ReportsEfficiency limitations of flat reflector antennas designed using quasi-conformal transformation optics are examined along with mechanisms to improve performance over wide bandwidths (> 2.5:1).
Benjamin Cross +2 more
doaj +2 more sources
Reflectionless plasmonic right-angled waveguide bend and divider using graphene and transformation optics [PDF]
International Conference on Electromagnetics in Advanced Applications, 2021 Transformation Optics (TO) is a mathematical method based on the invariance of Maxwell's equations under coordinate transformation. According to Fermat's principle, in a medium with non-uniform refractive index the wave propagates along the shortest ...
Samaneh Pakniyat +3 more
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