Giant nonreciprocity near exceptional-point degeneracies

Thomas, Roney; Li, Huanan; Ellis, F. M.

doi:10.1103/physreva.94.043829

Cited by 39 publications

(22 citation statements)

References 51 publications

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“…These ideas have recently been further developed in the studies by Thomas et al, Zhang et al, Del Bino et al, Koutserimpas and Fleury. [ 228–232 ]…”

Section: Active Nonreciprocitymentioning

confidence: 99%

Up‐And‐Coming Advances in Optical and Microwave Nonreciprocity: From Classical to Quantum Realm

Kutsaev

Krasnok

Romanenko

et al. 2021

Advanced Photonics Research

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Reciprocity is a fundamental physical principle that roots in the time‐reversal symmetry of physical laws. It allows making predictions on any arbitrary complex system's response and operation and hence simplifies the analysis. However, there are many practical situations in which it is advantageous to break reciprocity, e.g., isolators preventing wave scattering back to lasers and generators, full‐duplex systems for multiplexing transmission and receiving in the same channel, nonreciprocal cavity excitation, and protection of fragile states of superconductor quantum computers from thermal noise. The most widespread approach to time‐reversal symmetry breaking and nonreciprocity based on magnetic field biasing suffers from bulkiness, cost ineffectiveness, and loss, motivating researchers and engineers to search for more practical approaches. Herein, the up‐and‐coming advances in optical nonreciprocity, including new materials (Weyl semimetals, topological insulators, metasurfaces), active structures, time‐modulation, parity‐time (PT)‐symmetry breaking, nonlinearity combined with a structural asymmetry, quantum nonlinearity, unidirectional gain and loss, chiral quantum states and valley polarization are overviewed. A general description of nonreciprocal systems is provided and the pros and cons of the mentioned approaches to nonreciprocity are discussed.

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“…These ideas have recently been further developed in the studies by Thomas et al, Zhang et al, Del Bino et al, Koutserimpas and Fleury. [ 228–232 ]…”

Section: Active Nonreciprocitymentioning

confidence: 99%

Up‐And‐Coming Advances in Optical and Microwave Nonreciprocity: From Classical to Quantum Realm

Kutsaev

Krasnok

Romanenko

et al. 2021

Advanced Photonics Research

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“…In this paper, we focus on SIPs because of their diverse potential applications: loss-induced transparency, unidirectional invisibility, lasing mode selection, lasing revivals and suppression, directional lasing, hypersensitive sensors, etc. [3]. The SIP scenario is also interesting and attractive because the frozen mode regime can be observed over a wide frequency range, ranging from RF [4][5][6], to optical frequencies [7].…”

Section: Introductionmentioning

confidence: 99%

Frozen mode in an asymmetric serpentine optical waveguide

Parareda,

Vitebksiy,

Scheuer

et al. 2021

Preprint

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We show the existence of a frozen mode in a periodic serpentine waveguide with broken longitudinal symmetry. The frozen mode is associated with a stationary inflection point (SIP) of the Bloch dispersion relation, where three Bloch eigenmodes collapse on each other. Indeed, we show that the SIP is an exceptional point of degeneracy of order three. The frozen mode regime is characterized by vanishing group velocity and enhanced field amplitude, which can be very attractive in various applications including dispersion egineering, lasers, and delay lines. We show the trend in group delay and quality factor with waveguide length that is peculiar of the frozen mode. In a finite length waveguide, full transmission occurs at the resonance frequency very close to the SIP frequency.

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“…Symmetries and their violations constitute an important theme of investigation, both for their own fundamental interest [1] and for their potential technological use in managing wave transport [2,3]. For example, the violation of time-reversal symmetry is a necessary condition for the realization of isolators and circulators [4,5,6]. Similarly, chiral [7,8] and charge-conjugation symmetries [7] have been proven important for the realization of defect modes which are topologically protected against disorder and which potentially enable robust unidirectional transport, mode selectivity, etc.…”

Section: Introductionmentioning

confidence: 99%

Reflective limiters based on self-induced violation of CT symmetry

Makri

Thomas

2018

Phys. Rev. A

Self Cite

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Non-Hermitian bipartite photonic lattices with charge-conjugation symmetry can support resonant defect modes which are resilient to bipartite losses and structural imperfections. When, however, a (self-)induced violation of the -symmetry occurs via tiny permittivity variations, the resonant mode is exposed to the bipartite losses and it is destroyed. Consequently, the transmission peak is suppressed while the reflectance becomes (almost) unity. We propose the use of such photonic systems as power switches, limiters, and sensors. I.

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Giant nonreciprocity near exceptional-point degeneracies

Cited by 39 publications

References 51 publications

Up‐And‐Coming Advances in Optical and Microwave Nonreciprocity: From Classical to Quantum Realm

Up‐And‐Coming Advances in Optical and Microwave Nonreciprocity: From Classical to Quantum Realm

Frozen mode in an asymmetric serpentine optical waveguide

Reflective limiters based on self-induced violation of CT symmetry

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