System deployment optimization in architecture design

Zhang, Xiaoxue; Shu, Tang; Luo, A-Li; Xue-shan, Luo

doi:10.1109/jsee.2014.00028

Cited by 6 publications

(7 citation statements)

References 18 publications

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“…Therefore, disorder parameter engineering is a more general formalism of composite-phase manipulation that is prevalently proposed in ordered metasurfaces. [44][45][46][47][48]…”

Section: Principle Of Disorder Parameter Engineeringmentioning

confidence: 99%

Emerging Long‐Range Order from a Freeform Disordered Metasurface

et al. 2022

Advanced Materials

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existence of defect or disorder will inevitably result in the destruction of intrinsic photonic bandgaps, thus impairing the practical performance of desired design for wave propagation. [2] By contrary, recent developments in micro-and nanophotonics have demonstrated that disorder structure with spatially inhomogeneous material, including random or chaotic structures, could be well utilized as an another degree of freedom to yield various new optical phenomena. [3][4][5] Particularly, a variety of nonconventional optical functionalities have been proposed in diverse areas of optical applications, ranging from optical Anderson localization in deep subwavelength photonic structures, [6] broadband momentum transformation and spatiotemporal instability suppression in a chaotic optical microcavity, [7,8] and optical transition in the disordered plasmonic system [9,10] to perfect focusing in disordered media. [11,12] Consisting of arrays of artificial nanostructures (or meta-atoms), metasurface can arbitrarily manipulate the amplitude, phase, and polarization of the incident light field at subwavelength scale [13][14][15] and therefore has been widely applied to planar imaging, [16][17][18][19] meta-holograms, [20][21][22] quantum optics, [23][24][25][26] and complex beam generators. [27][28][29][30][31] Most recently, disorder engineering has been introduced into metasurface by randomly manipulating the spatially inhomogeneous phase retardation of meta-atoms, Recently, disordered metasurfaces have attracted considerable interest due to their potential applications in imaging, holography, and wavefront shaping. However, how to emerge long-range ordered phase distribution in disordered metasurfaces remains an outstanding problem. Here, a general framework is proposed to generate a spatially homogeneous in-plane phase distribution from a disordered metasurface, by engineering disorder parameters together with topology optimization. As a proof-of-concept demonstration, an all-dielectric disordered supercell metasurface with relatively homogeneous in-plane phase fluctuation is designed by disorder parameter engineering, manifesting as polarization conversion-dependent random scattering or unidirectional transmission. Then, a topology optimization approach is utilized to overcome the lattice coupling effect and to further improve the homogeneity of complex electric field fluctuation. In comparison with the initial supercell metasurface, both the phase fluctuation range and the relative efficiency of the topologyoptimized freeform metasurface are significantly improved, leading to a long-range ordered electric field distribution. Moreover, three experimental realizations are performed, all of which agree well with the theoretical results. This methodology may inspire more exotic optical phenomena and find more promising applications in disordered metasurfaces and disordered optics.

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“…Therefore, disorder parameter engineering is a more general formalism of composite-phase manipulation that is prevalently proposed in ordered metasurfaces. [44][45][46][47][48]…”

Section: Principle Of Disorder Parameter Engineeringmentioning

confidence: 99%

Emerging Long‐Range Order from a Freeform Disordered Metasurface

et al. 2022

Advanced Materials

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“…The small meta-atom size compared to the wavelength and design flexibility enable unprecedented superiority for amplitude, phase, and polarization manipulations at the subwavelength scale. 4) Various devices, such as emitters, 5) lenses, 6) optical holograms, 7) wave plates, 8) and vortex generators, 9) as well as numerous exotic phenomena including spin Hall effect 10) and asymmetric photonic spin-orbit interactions (SOIs) 11,12) have been demonstrated using metasurfaces. It is worth noting that asymmetric photonic SOIs allow simultaneous giant circular asymmetric transmission and wavefront shaping, 13) achieved through chiral Z-shape resonators.…”

mentioning

confidence: 99%

Metasurfaces for broadband dispersion engineering through custom-tailored multi-resonances

Zhang

Cai

et al. 2018

Appl. Phys. Express

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Spectrometers, superprisms, and achromatic lenses are examples of structures where the dispersion property of electromagnetic waves is utilized. The traditional systems for dispersion engineering are rather heavy, bulky, and inflexible. This paper reports ultrathin metasurfaces with custom-tailored multi-resonances for broadband dispersion engineering, including negative, positive, zero, and hyper-negative dispersions. The designed elements have multiple degrees of freedom to excite and modulate the resonances, while ensuring a high efficiency. Within the operating bandwidth (8–12 µm), the average efficiency is approximately 60%. The dispersion engineering with a high efficiency may provide new functionalities to metasurfaces, not available in traditional diffraction or refraction devices.

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“…However, most existing SOI-based devices possess a fixed functionality once fabricated, which hinder their widespread applications in practice. Interestingly, asymmetric SOIs 12) have been recently reported and enable many multifunctional chiral devices 13) by emerging geometric phase and propagation phase. Although asymmetric SOIs can utilize orthogonal states of circular polarization as two carriers of different information, polarization is not suitable as the secret key of information encryption in this case.…”

mentioning

confidence: 99%

“…In our previous study, we have demonstrated that the total phase should consist of geometric phase and WPP, (or plasmonic resonance phase) for an anisotropic antenna, and these two phases can be independently controlled with negligible crosstalk. 12,13,27) The geometric phase, originating from photonic SOIs, is relative to the rotation angle of antenna, 28) but WPP almost depends only on the intrinsic properties of the antenna, including size, material and shape. 12) For simplicity, we assume a transparent anisotropic antenna that can introduce a WPP of f for cross-polarized component of reflected light.…”

mentioning

confidence: 99%

“…12,13,27) The geometric phase, originating from photonic SOIs, is relative to the rotation angle of antenna, 28) but WPP almost depends only on the intrinsic properties of the antenna, including size, material and shape. 12) For simplicity, we assume a transparent anisotropic antenna that can introduce a WPP of f for cross-polarized component of reflected light. Then, performing a rotation by an angle of β with respect to the x-axis, thus, the total phases in the two states of GST should be described as 2σβ + f a and 2σβ + f c , respectively, where σ indicates the spin of incident CP light, and f a and f c present the WPPs of GST-based element in its amorphous and crystalline states, respectively.…”

mentioning

confidence: 99%

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Metasurfaces for independent manipulation of the wavefronts in the different states of phase change materials

Zhang¹,

Zhang²,

Ou³

et al. 2018

Appl. Phys. Express

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Metasurfaces have attracted increasing attention due to their extraordinary capability in the arbitrary control of electromagnetic waves. However, most metasurfaces lack flexibility and only enable fixed optical performance once fabricated. In this work, we propose ultra-thin metasurfaces with varied functionalities using phase change materials (PCMs) when phase change occurs on whole structured PCMs, which has not been found in previous reports. The wavefronts in the amorphous and crystalline states of the PCMs can be arbitrarily and independently modulated with high efficiency (∼60% and ∼40% in the two states, respectively). This work may be valuable for information encryption and optical communications.

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System deployment optimization in architecture design

Cited by 6 publications

References 18 publications

Emerging Long‐Range Order from a Freeform Disordered Metasurface

Emerging Long‐Range Order from a Freeform Disordered Metasurface

Metasurfaces for broadband dispersion engineering through custom-tailored multi-resonances

Metasurfaces for independent manipulation of the wavefronts in the different states of phase change materials

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