Four-port photonic structures with mirror-time reversal symmetries

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

doi:10.1088/1367-2630/18/7/075010

Cited by 5 publications

(4 citation statements)

References 33 publications

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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

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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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Section: Introductionmentioning

confidence: 99%

Reflective limiters based on self-induced violation of CT symmetry

Makri

Thomas

2018

Phys. Rev. A

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“…This combined  symmetry leads to subtle changes in the unitary evolution of the system and modification of the inner product [4][5][6][7]. As  symmetry represents an extension of quantum mechanics, it is nowadays used in various different contexts, such as quantum reflection [8][9][10] and chaos [11], and has even been generalized to fermionic [12,13], gyrotropic [14,15] and magnetic systems [16].…”

Section: Introductionmentioning

confidence: 99%

Instantaneous modulations in time-varying complex optical potentials

2017

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We study the impact of a spatially homogeneous yet non-stationary dielectric permittivity on the dynamical and spectral properties of light. Our choice of potential is motivated by the interest in  -symmetric systems as an extension of quantum mechanics. Because we consider a homogeneous and non-stationary medium,  symmetry reduces to time-reversal symmetry in the presence of balanced gain and loss. We construct the instantaneous amplitude and angular frequency of waves within the framework of Maxwell's equations and demonstrate the modulation of light amplification and attenuation associated with the well-defined temporal domains of gain and loss, respectively. Moreover, we predict the splitting of extrema of the angular frequency modulation and demonstrate the associated shrinkage of the modulation period. Our theory can be extended for investigating similar time-dependent effects with matter and acoustic waves in  -symmetric structures.

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“…The transition between these two phases occurs via an EP [3]. A prominent example of such antilinear systems are structures with parity-time (PT ) symmetry [6][7][8][9][10][11][15][16][17][18][19][20][21][22][23][24][25][26].…”

Section: Introductionmentioning

confidence: 99%

Giant nonreciprocity near exceptional-point degeneracies

Thomas

Ellis

2016

Phys. Rev. A

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We show that gyrotropic structures with balanced gain and loss that respect anti-linear symmetries exhibit a giant non-reciprocity at the so-called exact phase where the eigenfrequencies of the isolated non-Hermitian set-up are real. The effect occurs in a parameter domain near an exceptional point (EP) degeneracy, where mode-orthogonality collapses. The theoretical predictions are confirmed numerically in the microwave domain, where a non-reciprocal transport above 90dB is demonstrated, and are further verified using lump-circuitry modeling. The analysis allows us to speculate the universal nature of the phenomenon for any wave system where EP and gyrotropy can co-exist.

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Four-port photonic structures with mirror-time reversal symmetries

Cited by 5 publications

References 33 publications

Reflective limiters based on self-induced violation of CT symmetry

Reflective limiters based on self-induced violation of CT symmetry

Instantaneous modulations in time-varying complex optical potentials

Giant nonreciprocity near exceptional-point degeneracies

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