Unidirectional reflectionless light propagation at exceptional points

Huang, Yin; Shen, Yuecheng; Min, Changjun; Fan, Shanhui; Veronis, Georgios

doi:10.1515/nanoph-2017-0019

Cited by 123 publications

(65 citation statements)

References 148 publications

(181 reference statements)

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“…Many interesting wave phenomena have been observed on PT -symmetric optical structures. Noticeable examples include unidirectional reflectionless propagation [5][6][7][8][9][10][11][12][13][14][15][16][17], single-mode lasing [18,19], and simultaneous lasing and coherent perfect absorption [20,21].…”

Section: Introductionmentioning

confidence: 99%

Unidirectional reflectionless transmission for two-dimensional PT -symmetric periodic structures

Yuan

2019

Phys. Rev. A

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Unidirectional reflectionless propagation (or transmission) is an interesting wave phenomenon observed in many PT -symmetric optical structures. Theoretical studies on unidirectional reflectionless transmission often use simple coupled-mode models. The coupled mode theory can reveal the most important physical mechanism for this wave phenomenon, but it is only an approximate theory, and it does not provide accurate quantitative predictions with respect to geometric and material parameters of the structure. In this paper, we rigorously study unidirectional reflectionless transmission for two-dimensional (2D) PT -symmetric periodic structures sandwiched between two homogeneous media. Using a scattering matrix formalism and a perturbation method, we show that real zeroreflection frequencies are robust under PT -symmetric perturbations, and unidirectional reflectionless transmission is guaranteed to occur if the perturbation (of the dielectric function) satisfies a simple condition. Numerical examples are presented to validate the analytical results, and to demonstrate unidirectional invisibility by tuning the amplitude of balanced gain and loss. arXiv:1909.01517v1 [physics.optics]

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Section: Introductionmentioning

confidence: 99%

Unidirectional reflectionless transmission for two-dimensional PT -symmetric periodic structures

Yuan

2019

Phys. Rev. A

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“…By using Rydberg states [33,34] we can introduce interactions between the excitations and study the many-body effect in flux lattices [35]. An interesting connection of our results can also be made to the unidirectional reflectionless (invisible) photonic structures [36][37][38][39], such as the paritytime symmetric materials [40]. We have observed that under certain conditions one of the two reflectivities is nearly zero while the other is big.…”

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confidence: 62%

Experimental Observation of Momentum-Space Chiral Edge Currents in Room-Temperature Atoms

Cai

Liu

et al. 2019

Phys. Rev. Lett.

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Chiral edge currents play an important role in characterizing topological matter. In atoms, they have been observed at such a low temperature that the atomic motion can be measured. Here we report the first experimental observation of chiral edge currents in atoms at room temperature. Staggered magnetic fluxes are induced by the spatial phase difference between two standing-wave light fields, which couple atoms to form a momentum-space zigzag superradiance lattice. The chiral edge currents have been measured by comparing the directional superradiant emissions of two timed Dicke states in the lattice. This work paves the way for quantum simulation of topological matter with hot atoms and facilitates the application of topological physics in real devices.

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“…In particular, as concerns solitons, although P T -symmetric systems belong to the class of dissipative ones, where solitons generally exist as isolated attractors, selected by the condition of the double balance between the dispersion (or diffraction) and nonlinearity, and between the gain and loss (the latter principle is very important for the creation of stable temporal solitons in fiber lasers [102]), in P T -symmetric systems solitons exist in continuous families, similar to their counterparts in conservative models [100,101]. In addition to the interest to fundamental studies, systems with the P T symmetry offer promising applications, such as "light diodes", admitting unidirectional propagation of light in the waveguide, and lasers operating in the P T -symmetric regime [103].…”

Section: Dissipative and Parity-time Symmetric Waveguidesmentioning

confidence: 99%

Editorial: Guided-Wave Optics

Malomed

2017

Applied Sciences

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Guided waves represent a vast class of phenomena in which the propagation of collective excitations in various media is steered in required directions by fixed (or, sometimes, reconfigurable) conduits. Arguably, the most well-known and practically important waveguides are single-mode and multi-mode optical fibers [1,2], including their more sophisticated version in the form of photonic crystal fibers [3] and hollow metallic structures transmitting microwave radiation [4]. Light pipes, in the form of hollow tubes with reflecting inner surfaces, are used in illumination techniques. On the other hand, medical stethoscopes offer a commonly known example of a practically important acoustic waveguide. New directions of studies in photonics are focused on waveguides for plasmonic waves on metallic surfaces [5][6][7] (which provide the possibility of using wavelengths much smaller than those corresponding to the traditional optical range, and thus offer opportunities to build much more compact photonic devices) and on the other hand, on the guided transmission of terahertz waves, which also have a great potential for applications [8].Outside of the realm of photonics (optics and plasmonics) and acoustics, wave propagation plays a profoundly important role in many other areas; accordingly, waveguiding settings have drawn a great deal of interest in those areas as well. In particular, as concerns hydrodynamics, natural waveguides-which may be very long-exist for internal waves propagating in stratified liquids (e.g., in the ocean) [9]. Various settings in the form of waveguides for matter waves are well known in studies of Bose-Einstein condensates in ultracold bosonic gases [10,11]. In solid-state physics, guided propagation regimes for magnon waves in ferromagnetic media are a subject of theoretical and experimental studies [12]. In superconductivity, long Josephson junctions are waveguides for plasma waves [8,13]. The significance of waveguiding in plasma physics is also well-known; e.g., Ref [14][15][16].Below, a very brief overview of basic theoretical models and experimental realizations of various physical implementations of the waveguiding phenomenology is given. The text is structured according to the character of the guided wave propagation: linear or nonlinear and conservative or dissipative, as well as according to the materials used in the underlying settings, natural or artificial.This presentation definitely does not aim to include an exhaustive bibliography on this vast research area. References are given chiefly to review articles and books summarizing the known results, rather than to original papers where the results were first published. However, in some cases original papers are also cited if it is necessary in the context of the presentation. Linear WaveguidesThe basic waveguiding structure is a single-mode conduit, designed with a sufficiently small transverse size and boundary conditions at the boundary between the guiding core and surrounding cladding, which admits the propagation of a single tr...

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Unidirectional reflectionless light propagation at exceptional points

Cited by 123 publications

References 148 publications

Unidirectional reflectionless transmission for two-dimensional PT -symmetric periodic structures

Unidirectional reflectionless transmission for two-dimensional PT -symmetric periodic structures

Experimental Observation of Momentum-Space Chiral Edge Currents in Room-Temperature Atoms

Editorial: Guided-Wave Optics

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