Microwave Limiters Implemented by Coupled Dielectric Resonators Based on a Topological Defect Mode and CT-Symmetry Breaking

Reisner, Mattis; Mortessagne, Fabrice; Makri, Eleana; Kuhl, Ulrich

doi:10.12693/aphyspola.136.790

Cited by 6 publications

(4 citation statements)

References 26 publications

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“…As the resonance frequency is below the cut-off frequency of the first TE mode defined by the two plates, the adjacent resonators are coupled through evanescent wave components, leading to an approximately exponential decay of the coupling strength t with the distance between the resonators 26 . The system is excited via a loop antenna fixed in the movable top plate, thus allowing the spatial scanning of the magnetic field B z , which is the only magnetic field component for this mode 38 . From the reflection measurements performed by a vector network analyzer (ZVA 24 from Rohde & Schwarz), the local density of states can be extracted (for details see ref.…”

Section: Methodsmentioning

confidence: 99%

Observation of supersymmetric pseudo-Landau levels in strained microwave graphene

et al. 2020

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Using an array of coupled microwave resonators arranged in a deformed honeycomb lattice, we experimentally observe the formation of pseudo-Landau levels in the whole crossover from vanishing to large pseudomagnetic field strengths. This result is achieved by utilising an adaptable setup in a geometry that is compatible with the pseudo-Landau levels at all field strengths. The adopted approach enables us to observe the fully formed flat-band pseudo-Landau levels spectrally as sharp peaks in the photonic density of states and image the associated wavefunctions spatially, where we provide clear evidence for a characteristic nodal structure reflecting the previously elusive supersymmetry in the underlying low-energy theory. In particular, we resolve the full sublattice polarisation of the anomalous 0th pseudo-Landau level, which reveals a deep connection to zigzag edge states in the unstrained case.

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Section: Methodsmentioning

confidence: 99%

Observation of supersymmetric pseudo-Landau levels in strained microwave graphene

et al. 2020

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“…invention of new topological concepts and classifications. It was, therefore, only natural that the interplay between non-Hermiticity and topological protection attracted recently a lot of theoretical and experimental interest [16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33]. Some of the questions that have been raised include the generalization of band-edge correspondence, the emergence of new topological states without any Hermitian counterpart, or the necessity of a new topological phase classification [2,25,29,31].…”

mentioning

confidence: 99%

“…Some of the questions that have been raised include the generalization of band-edge correspondence, the emergence of new topological states without any Hermitian counterpart, or the necessity of a new topological phase classification [2,25,29,31]. On the technological side, the development of novel classes of topologically protected lasers [26][27][28] and reflective photonic limiters [22,32,33] introduced a new excitement and the urge to understand better the formation and spectral stability of topological states in the framework of non-Hermitian physics.…”

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confidence: 99%

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Non-Hermitian CT-Symmetric Spectral Protection of Nonlinear Defect Modes

Jeon,

Reisner,

Mortessagne

et al. 2020

Preprint

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We investigate, using a microwave platform consisting of a non-Hermitian Su-Schrieffer-Heeger array of coupled dielectric resonators, the interplay of a lossy nonlinearity and CT -symmetry in the formation of defect modes. The measurements agree with the theory which predicts that, up to moderate pumping, the defect mode is an eigenstate of the CT -symmetric operator and retains its frequency at the center of the gap. At higher pumping values, the system undergoes a self-induced explicit CT -symmetry violation which removes the spectral topological protection and alters the shape of the defect mode.

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Self-Shielded Topological Receiver Protectors

Reisner

Jeon²,

Schindler³

et al. 2020

Phys. Rev. Applied

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Receiver protectors (RPs) shield sensitive electronics from high-power incoming signals that might damage them. Typical RP schemes range from simple fusing and PIN diodes, to superconducting circuits and plasma cells -each having a variety of drawbacks associated with unacceptable system downtime and self-destruction, to significant insertion losses and power consumption. Here, we theoretically propose and experimentally demonstrate a unique self-shielding RP based on a coupled-resonator-microwave-waveguide (CRMW) with a topological defect being inductively coupled to a diode. This RP utilizes a charge-conjugation (C) symmetric resonant defect mode that is robust against disorder and demonstrates high transmittance at low incident powers. When incident power exceeds a critical value, a self-induced resonant trapping effect occurs leading to a dramatic suppression of transmittance and a simultaneous increase of the reflectance close to unity. The proposed RP device is self-protected from overheating and electrical breakdown and can be utilized in radars, reflection altimeters, and a broad range of communication systems.

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Microwave Limiters Implemented by Coupled Dielectric Resonators Based on a Topological Defect Mode and CT-Symmetry Breaking

Cited by 6 publications

References 26 publications

Observation of supersymmetric pseudo-Landau levels in strained microwave graphene

Observation of supersymmetric pseudo-Landau levels in strained microwave graphene

Non-Hermitian CT-Symmetric Spectral Protection of Nonlinear Defect Modes

Self-Shielded Topological Receiver Protectors

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