Isotropic properties of the photonic band gap in quasicrystals with low-index contrast

Rose, T. Priya; Gennaro, Emiliano Di; Abbate, Giancarlo; Andreone, A.

doi:10.1103/physrevb.84.125111

Cited by 11 publications

(1 citation statement)

References 33 publications

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“…A monomodal open resonator can be easily created by introducing a lattice defect in a periodically 28 or aperiodically ordered dielectric 29 or hybrid (metallo-dielectric) 30 arrangement. Point-defected cavities are based on the remarkable properties to isotropically reflect waves in certain ranges of frequencies called "band gaps" 31 , while allowing other frequencies to propagate. Major drawbacks in these structures are size, thermal load, and mode suppression critically dependent on the design.…”

Section: Pyramidal Metamaterials Absorber For Mode Damping In Microwavmentioning

confidence: 99%

Pyramidal metamaterial absorber for mode damping in microwave resonant structures

Chikhi

Passarelli

Andreone

et al. 2020

Sci Rep

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In many resonant structures the damping of parasitic or higher order modes is indispensable to guarantee a correct and stable performance. This is particularly true in the microwave region in case of cavities or other resonant systems operating in accelerating structures, where the mitigation of spurious resonance effects is mandatory to achieve high quality particle beams. We present the results on the mode suppression in a real pillbox cavity by inserting a properly designed pyramidal metamaterial that acts as light, small volume damper for specific resonances in the range 3–4 GHz, only slightly perturbing other intrinsic modes. Measurements of the cavity response without and with the metamaterial absorber are presented and compared with full wave simulations. Field distribution for the pillbox intrinsic modes under scrutiny is also presented, showing that damping induced by the metamaterial critically depends on its relative position inside the cavity.

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Section: Pyramidal Metamaterials Absorber For Mode Damping In Microwavmentioning

confidence: 99%

Pyramidal metamaterial absorber for mode damping in microwave resonant structures

Chikhi

Passarelli

Andreone

et al. 2020

Sci Rep

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Interface States in the Acoustic Quasiperiodic System Based on Non‐Bragg Resonances

Liu

Peng

Zhang

et al. 2021

Physica Status Solidi (b)

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Bragg resonances have been observed in traditional quasiperiodic waveguides for years. To enhance Bragg resonances and form Bragg gaps with high attenuation, a large number of units have been included. Here, a Fibonacci quasiperiodic acoustic waveguide based on an intense resonance mechanism is proposed to realize non‐Bragg resonances. In a waveguide with fewer units, non‐Bragg resonances can still be excited and create the related non‐Bragg gaps with high attenuation beyond the Bragg ones. Furthermore, an interface state arising in non‐Bragg gaps is experimentally observed by fabricating the mirror‐symmetry structure of Fibonacci quasi‐periodic waveguides. The field distribution of interface states exhibits a significant feature of sound energy, which is localized at a quarter wavelength from the interface of the mirror structures on both sides. Unlike the interface state in Bragg gaps (the localized sound energy distributes along the longitudinal direction), the interface state in non‐Bragg gaps displays localization along the longitudinal and radial directions, and the field distribution is like a dipole, which can be used to optimize traditional quasiperiodic waveguide structures and pave the way for various functional devices, which include multimode filters, sensors, couplers, and so on.

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Recent Advances in Superlattice Frequency Multipliers

Schevchenko

Apostolakis

Pereira

2021

Terahertz (THz), Mid Infrared (MIR) and Near Infrared (NIR) Technologies for Protection of Critical Infrastructures Against Exp

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Semiconductor superlattice frequency multipliers have emerged as a nonlinear medium able to generate radiation in a wide frequency range. This property facilitates the potential of sources suitable for sensing and spectroscopy applications. In this study, we further investigate the consequences on harmonic generation in a superlattice multiplier after excitation by an input signal oscillating at different frequencies. Here we provide a rigorous description of our theoretical model including a semiclassical Boltzmann approach to nonlinear miniband transport and non-equilibrium Green's functions calculations treating scattering processes under forward and reverse bias. To fully exploit the features of this radiation source, we focus on the effects of elastic scattering and systematic imperfections in the superlattice structure which lead to asymmetric current flow.

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Isotropic properties of the photonic band gap in quasicrystals with low-index contrast

Cited by 11 publications

References 33 publications

Pyramidal metamaterial absorber for mode damping in microwave resonant structures

Pyramidal metamaterial absorber for mode damping in microwave resonant structures

Interface States in the Acoustic Quasiperiodic System Based on Non‐Bragg Resonances

Recent Advances in Superlattice Frequency Multipliers

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