Asymmetric light transmission effect based on an evolutionary optimized semi-Dirac cone dispersion photonic structure

Bor, Emre; Turduev, Mırbek; Yasa, Utku Görkem; Kurt, Hamza; Staliūnas, Kęstutis

doi:10.1103/physrevb.98.245112

Cited by 25 publications

(9 citation statements)

References 53 publications

(75 reference statements)

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“…In this study, the Differential Evolution (DE) algorithm is used to obtain an ultra-compact, high-NA and broadband functional achromatic MDL. Here, DE algorithm is chosen as a design method due to its previous achievements in the earlier studies [4,[30][31][32]. The DE algorithm can be considered as an evolutionary algorithm which mimics the natural evolution and selection processes for survival of the fittest function.…”

Section: Design Methodology and Numerical Results Of Amdlmentioning

confidence: 99%

Ultra-compact, high-numerical-aperture achromatic multilevel diffractive lens via metaheuristic approach

2021

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Recently, the multilevel diffractive lenses (MDLs) have attracted considerable attention mainly due to their superior wave focusing performance; however, efforts to correct the chromatic aberration are still in progress. Here, we demonstrate the numerical design and experimental demonstration of high-numerical aperture (NA) (~0.99), diffraction-limited achromatic multilevel diffractive lens (AMDL) operating in microwave range 10 GHz-14 GHz. A multi-objective differential evolution (MO-DE) algorithm is incorporated with the three-dimensional finite-difference time-domain (3D FDTD) method to optimize both the heights and widths of each concentric ring (zone) of the AMDL structure. In this study, the desired focal distance ( d F  ) is treated as an optimization parameter in addition to the structural parameters of the zones for the first time. In other words, MO-DE diminishes the necessity of predetermined focal distance and center wavelength by also providing an alternative method for phase profile tailoring. The proposed AMDL can be considered as an ultra-compact, the radius is 3.7 c  where c  is the center wavelength (i.e., 12 GHz frequency), and flat lens which has a thickness of . c The numerically calculated full-width at half-maximum (FWHM) values are below 0.554λ and focusing efficiency values are varying between 28% and 45.5%. To experimentally demonstrate the functionality of the optimized lens, the AMDL composing of polylactic acid material (PLA) polymer is fabricated via 3D-printing technology. The numerical and experimental results are compared, discussed in detail and a good agreement between them is observed. Moreover, the verified AMDL in microwave regime is scaled down to the visible wavelengths to observe achromatic and diffraction-limited focusing behavior between 380 nm -620 nm wavelengths.

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Section: Design Methodology and Numerical Results Of Amdlmentioning

confidence: 99%

Ultra-compact, high-numerical-aperture achromatic multilevel diffractive lens via metaheuristic approach

2021

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“…3c) 71,72 . The semi-Dirac-like cone is useful for applications in directional emission 73 , asymmetric transmission 74 , beam deflection, beam splitting, and light focusing 75 . As most 2D DCZIMs are designed for either TM or TE polarization, fullpolarization Dirac-like cones induced by the degeneracy of a TM Dirac-like cone and a TE Dirac-like cone at the same frequency can show zero-index behavior regardless of the polarization of the incident light.…”

Section: Classification Of Dczimsmentioning

confidence: 99%

Dirac-like cone-based electromagnetic zero-index metamaterials

Chan

Mazur

2021

Light Sci Appl

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Metamaterials with a Dirac-like cone dispersion at the center of the Brillouin zone behave like an isotropic and impedance-matched zero refractive index material at the Dirac-point frequency. Such metamaterials can be realized in the form of either bulk metamaterials with efficient coupling to free-space light or on-chip metamaterials that are efficiently coupled to integrated photonic circuits. These materials enable the interactions of a spatially uniform electromagnetic mode with matter over a large area in arbitrary shapes. This unique optical property paves the way for many applications, including arbitrarily shaped high-transmission waveguides, nonlinear enhancement, and phase mismatch-free nonlinear signal generation, and collective emission of many emitters. This review summarizes the Dirac-like cone-based zero-index metamaterials’ fundamental physics, design, experimental realizations, and potential applications.

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“…Dual-polarization Dirac-like cones, i.e., the existence of Dirac-like cones for both transverse electric and magnetic polarizations in 2D PhC, have been proposed [39,127,128]. Semi-Dirac cones, which exhibit linear-parabolic dispersion, were created by the accidental degeneracy of two modes with a linear dispersion in one direction but a quadratic dispersion in the other direction [129][130][131][132][133][134]. The PhC with a semi-Dirac cone behaves as an intriguing class of anisotropic ZIM with ε eff μ eff 0 along only one direction.…”

Section: Introductionmentioning

confidence: 99%

Hermitian and Non-Hermitian Dirac-Like Cones in Photonic and Phononic Structures

Luo

Lai

2022

Front. Phys.

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Accidental degeneracy plays an important role in the generation of novel band dispersions. Photonic structures that exhibit an accidental Dirac-like conical dispersion at the center of the Brillouin zone can behave like a zero-index material at the Dirac-point frequency, leading to a number of unique features, such as invariant phase in space, wave tunneling, photonic doping and anti-doping, etc. Such a phenomenon has been explored in on-chip structures or three dimensions recently. The introduction of non-Hermiticity into the system via loss or gain could transform the accidental Dirac-like cone into a spawning ring of exceptional points, a complex Dirac-like cone or other unique dispersions. Similar Dirac-like cones and related physics are also observed in phononic structures. This review presents an overview of the accidental-degeneracy-induced Dirac-like cones at the center of the Brillouin zone in both photonic and phononic structures, including the fundamental physics, effective-medium description and experimental demonstration, as well as current challenges and future directions.

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Asymmetric light transmission effect based on an evolutionary optimized semi-Dirac cone dispersion photonic structure

Cited by 25 publications

References 53 publications

Ultra-compact, high-numerical-aperture achromatic multilevel diffractive lens via metaheuristic approach

Ultra-compact, high-numerical-aperture achromatic multilevel diffractive lens via metaheuristic approach

Dirac-like cone-based electromagnetic zero-index metamaterials

Hermitian and Non-Hermitian Dirac-Like Cones in Photonic and Phononic Structures

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