Towards nanoscale multiplexing with parity-time-symmetric plasmonic coaxial waveguides

Alaeian, Hadiseh; Baum, B.; Janković, Vladan; Lawrence, Mark; Dionne, Jennifer A.

doi:10.1103/physrevb.93.205439

Cited by 17 publications

(7 citation statements)

References 41 publications

(112 reference statements)

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“…EPs of this kind may be studied experimentally, and there is a rapidly increasing number of studies related to fundamental science and technology. For example, there are studies with pump-induced lasers [7,8], microwave cavities and wires [9][10][11][12][13][14][15][16][17], LRC circuits [18], exciton-polariton billiards [19], and more [20,21].…”

Section: Introductionmentioning

confidence: 99%

Spectra, current flow, and wave-function morphology in a modelPT-symmetric quantum dot with external interactions

Tellander

Berggren

2017

Phys. Rev. A

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In this paper we use numerical simulations to study a two-dimensional (2D) quantum dot (cavity) with two leads for passing currents (electrons, photons, etc.) through the system. By introducing an imaginary potential in each lead the system is made symmetric under parity-time inversion (PT symmetric). This system is experimentally realizable in the form of, e.g., quantum dots in low-dimensional semiconductors, optical and electromagnetic cavities, and other classical wave analogs. The computational model introduced here for studying spectra, exceptional points (EPs), wave-function symmetries and morphology, and current flow includes thousands of interacting states. This supplements previous analytic studies of few interacting states by providing more detail and higher resolution. The Hamiltonian describing the system is non-Hermitian; thus, the eigenvalues are, in general, complex. The structure of the wave functions and probability current densities are studied in detail at and in between EPs. The statistics for EPs is evaluated, and reasons for a gradual dynamical crossover are identified.

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Section: Introductionmentioning

confidence: 99%

Spectra, current flow, and wave-function morphology in a modelPT-symmetric quantum dot with external interactions

Tellander

Berggren

2017

Phys. Rev. A

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“…[89,90] Some recent works propose to exploit PT symmetric concepts in plasmonic devices, for example, active polarization control of light using coaxial PT nanoplasmonic structure, [226] multiplexing in coaxial plasmonic waveguides. [227] Despite the significant possibilities of PT related ideas in plasmonics, its practical implementation requires precise manipulation in the distributions of the gain-loss elements at subwavelength scale, which might be difficult at times. So, accessing EP physics in general plasmonic systems can be challenging.…”

Section: Metamaterials and Plasmonicsmentioning

confidence: 99%

Parity‐Time Symmetry in Non‐Hermitian Complex Optical Media

et al. 2019

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The explorations of the quantum-inspired symmetries in optical and photonic systems have witnessed immense research interests both fundamentally and technologically in a wide range of subjects of physics and engineering. One of the principal emerging fields in this context is non-Hermitian physics based on parity-time symmetry, originally proposed in the studies pertaining to quantum mechanics and quantum field theory, recently ramified into diverse set of areas, particularly in optics and photonics. The intriguing physical effects enabled by non-Hermitian physics and PT symmetry have enhanced significant applications prospects and engineering of novel materials. In addition, it has observed increasing research interests in many emerging directions beyond optics and photonics. This Review paper attempts to bring together the state of the art developments in the field of complex non-Hermitian physics based on PT symmetry in various physical settings along with elucidating key concepts and background and a detailed perspective on new emerging directions. It can be anticipated that this trendy field of interest can be indispensable in providing new perspectives in maneuvering the flow of light in the diverse physical platforms in optics, photonics, condensed matter, opto-electronics and beyond, and offer distinctive applications prospects in novel functional materials.

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“…In a previous work, we showed that these eigenvalues correspond to modes localized to the gain and loss sections in the coaxial waveguide, with near-linear polarization distributions. 46 Because only the imaginary part of the channel refractive index is modulated, the resonance wavelength changes by less than a nanometer-a distinct advantage of this design over alternate phase-change material approaches. Although we report our findings for a specific wavelength with a specific geometry, future devices could easily be tailored across a wide spectral range by varying the dielectric channel thickness, the core diameter, and the aperture's length.…”

Section: Transmission Of the Pt -Symmetric Coaxial Resonatormentioning

confidence: 99%

“…The location of the EP in parameter space is controlled by the degree of non-Hermiticity and geometry. While a finite amount of loss and gain is generally required to reach an EP, recent designs based on modal degeneracy and temporal variation can enable thresholdless operation [45][46][47][48] . These distributions help PT -symmetric systems become realizable with physical values of gain and loss, and they are fully leveraged in the coaxial geometry under investigation in this work.…”

Section: Introductionmentioning

confidence: 99%

Active polarization control with a parity-time-symmetric plasmonic resonator

Baum¹,

Lawrence²,

Barton³

et al. 2018

Phys. Rev. B

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Control of the polarization state of light is essential for many technologies, but is often limited by weak light-matter interactions that necessitate long device path lengths or significantly reduce the signal intensity. Here, we investigate a nanoscale plasmonic aperture capable of modifying the polarization state of far-field transmitted light without loss in the probe signal. The aperture is a coaxial resonator consisting of a dielectric ring embedded within a metallic film; parity-time (PT) symmetric inclusions of loss and gain within the dielectric ring enable polarization control. Since the coaxial aperture enables near-thresholdless PT symmetry breaking, polarization control is achieved with realistic levels of loss and gain. Exploiting this sensitivity, we show that the aperture can function as a tunable waveplate, with the transmitted ellipticity of circularly polarized incident light changing continuously with the dissipation coefficient from pi/2 to 0 (i.e. linear polarization). Rotation of linearly polarized light with unity efficiency is also possible, with a continuously-tunable degree of rotation. This compact, low-threshold, and reconfigurable polarizer may enable nextgeneration, high-efficiency displays, routers, modulators, and metasurfaces.Recently, the concept of PT symmetry has been extended to the polarization degree of freedom. Employing a periodic array of specially designed subwavelength resonators, or meta-atoms, distinct amplification or dissipation rates can be achieved for spatially co-located but orthogonally polarized light. 37,42-44 These highly anisotropic systems have been shown to exhibit polarization phase transitions and polarization exceptional arXiv:1712.05383v2 [physics.optics]

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Towards nanoscale multiplexing with parity-time-symmetric plasmonic coaxial waveguides

Cited by 17 publications

References 41 publications

Spectra, current flow, and wave-function morphology in a modelPT-symmetric quantum dot with external interactions

Spectra, current flow, and wave-function morphology in a modelPT-symmetric quantum dot with external interactions

Parity‐Time Symmetry in Non‐Hermitian Complex Optical Media

Active polarization control with a parity-time-symmetric plasmonic resonator

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