Diffractive switching by interference in a tailored PT-symmetric grating

Rivolta, Nicolas; Maes, Björn

doi:10.1364/josab.32.001330

Cited by 15 publications

(9 citation statements)

References 45 publications

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“…In other words, to achieve a PTsymmetric optical potential, the real part of the permittivity shall be an even function of position while its imaginary part must be an odd one. The interest in PT-symmetry of photonic systems relies on the exotic properties including, to cite some [3], asymmetric propagation [33,34], reflection [35], scattering [36], unidirectional invisibility [37,38], switching [39,40], and extraordinary non-linear behaviors [41,42]. These intriguing phenomena have been already observed in dielectric waveguides [43] and cavities [44] or photonic lattices [45,46], among other realizations [3].…”

Section: Introductionmentioning

confidence: 99%

Tunable Unidirectivity of Metal-Dielectric-Metal Plasmonic Nanoantennas With PT-Symmetric Potentials

Zhang

Cheng

et al. 2019

Front. Phys.

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Parity-time (PT) symmetric photonic systems have attracted much attention due to their intriguing properties and asymmetric behaviors. In this paper, we propose a plasmonic nanoantenna with PT-symmetric potential for unidirectional scattering functionality. The studied plasmonic nanoantenna is comprised of three metallic layers separated by two dielectric layers. Such kind of system, with the same coefficient κ of loss and gain in each of the two dielectric layers, holds the characteristic of PT symmetry. We show that the unidirectional scattering is obtained for the passive structure (i.e., κ = 0), and the switching between forward and backward directionality can be achieved with a single structure by changing the excitation wavelength, when the induced electric dipole (ED) and magnetic dipole (MD) modes satisfy the first or second Kerker conditions, respectively. In addition, we find that the forward-to-backward ratio spectra can be strongly affected by the non-Hermiticity parameter κ. In particular, it is possible to reverse the radiation direction at the same wavelength in a wide spectra band by adjusting κ. Moreover, putting the nanoantennas in an array of transverse configuration can efficiently narrow the main lobe angular beam width to be <6 •. These results contribute to the basic understanding of the optical properties of active-passive finite nanostructures with potential applications, and provide new ideas for the design of novel nanostructures displaying asymmetric and tunable responses.

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Section: Introductionmentioning

confidence: 99%

Tunable Unidirectivity of Metal-Dielectric-Metal Plasmonic Nanoantennas With PT-Symmetric Potentials

Zhang

Cheng

et al. 2019

Front. Phys.

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“…Since then, numerous phenomena have been reported in the field of parity time symmetric optics. To cite, some of them include: onset of chaos in optomechanical systems [5], optical mesh lattices [6][7][8], modulational invisibility in complex media [9], Peregrine soliton dynamics [10], plasmon excitation [11,12], unidirectional reflectionlessness, invisibility and non-reciprocity in periodic structures [13][14][15][16][17], whispering gallery modes [18], microring resonators [19][20][21], optical oligomers [22][23][24][25] and so on.…”

Section: Introductionmentioning

confidence: 99%

Highly amplified light transmission in a parity-time symmetric multilayered structure

Deka

Sarma

2018

Appl. Opt.

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We propose a parity-time symmetric dielectric-nanofilm-dielectric multilayered structure that could facilitate highly amplified transmission of optical power in the infrared spectrum. We have theoretically studied our model using the transfer matrix formalism. The reflection and the transmission coefficients of the S-matrix are evaluated. The theoretical results are validated by FDTD numerical simulation. We have shown how the thickness of the layers and the gain/loss coefficient of the active layers could generate spectral singularities in the S-matrix and how these singularities could be exploited to achieve amplified transmission of a single wavelength through the structure.

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“…Parity-time symmetry has been successfully harnessed in many photonic structures, such as directional couplers [8,9], switching devices [10,11], plasmonic structures [12], Bragg reflectors [13], microring resonators and microdisks [14,15], gratings [16][17][18] (or even phononic grating [19]), quasicrystals [20][21][22], robust transport [23,24], and others [25,26]. The field of topology, on the other hand, examines the conservation of mathematical or physical properties under continuous deformations.…”

Section: Introductionmentioning

confidence: 99%

Topological edge modes with PT symmetry in a quasiperiodic structure

2017

Self Cite

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We investigate topological features of a one-dimensional photonic quasicrystal within the context of PT symmetry. Via the scattering characteristics, we analyze various properties of a particular mirrored structure, which supports topological edge modes in its band gaps. These interface modes display a nontrivial dependence on the quasiperiodic geometry, even in a passive system. Subsequently, the tailored addition of gain and loss generates curious PT -like features. For example, the quasicrystal high density of modes leads to complicated mode-merging behaviors between edge and band modes, such as the symmetry recovery phenomenon. Furthermore, anisotropic transmission resonances (connected with unidirectional invisibility) are also present, but they display richer patterns in comparison to previously studied periodic structures. Additionally, we examine lasing effects in detail, with numerics and a simple Fabry-Pérot model. The large variety of mode-merging behaviors opens the way to laser resonance engineering.

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Diffractive switching by interference in a tailored PT-symmetric grating

Cited by 15 publications

References 45 publications

Tunable Unidirectivity of Metal-Dielectric-Metal Plasmonic Nanoantennas With PT-Symmetric Potentials

Tunable Unidirectivity of Metal-Dielectric-Metal Plasmonic Nanoantennas With PT-Symmetric Potentials

Highly amplified light transmission in a parity-time symmetric multilayered structure

Topological edge modes with PT symmetry in a quasiperiodic structure

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