Designing All-Electric Subwavelength Metasources for Near-Field Photonic Routings

Long, Yang; Ren, Jie; Guo, Zhiwei; Jiang, Haitao; Wang, Yuqian; Sun, Yong; Chen, Hong

doi:10.1103/physrevlett.125.157401

Cited by 36 publications

(27 citation statements)

References 41 publications

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“…The switchable excitation directions of the Huygens dipole are different from those of spin dipoles because of obvious differences in symmetry characteristics. 49 These remarkable findings show that the near-field properties of a Huygens dipole can provide new physical insights into various unidirectional near-field couplings. [48][49][50] In this paper, we use two-dimensional (2D) transmission lines (TLs) with lumped elements to design and fabricate circuit-based HMMs and hyperbolic waveguides.…”

Section: Introductionmentioning

confidence: 94%

“…49 These remarkable findings show that the near-field properties of a Huygens dipole can provide new physical insights into various unidirectional near-field couplings. [48][49][50] In this paper, we use two-dimensional (2D) transmission lines (TLs) with lumped elements to design and fabricate circuit-based HMMs and hyperbolic waveguides. Then, we experimentally construct all-electric Huygens and spin metasources and demonstrate anomalous unidirectional excitation of high-k hyperbolic modes.…”

Section: Introductionmentioning

confidence: 94%

“…76,77 A near-field spin source couples with only one guided mode in the specific propagation direction determined by the handedness of the spin source. 49 Here, the hyperbolic waveguide is composed of a core layer of HMM and two cladding layers made of a double positive (DPS) medium. As in the above section, the circuit-based HMM is produced using TLs by loading series lumped capacitors in the x direction.…”

Section: Unidirectional Excitations Of Hyperbolic Guided Modes Using a Spin Metasourcementioning

confidence: 99%

“…The external integrated electric circuits and extra TL systems are exploited to modulate the phase delays of the constituent dipoles. 33,49 These are marked by the red dots in Fig. 4(b).…”

Section: Introductionmentioning

confidence: 99%

“…Especially, the Huygens metasource is strictly associated with the paritytime (PT ∶r → −r, t → −t) symmetry and thus will inherit these symmetry properties naturally. 49 In contrast, the spin dipoles and Janus dipoles are associated with the parity-reversal (P∶r → −r) symmetry and time-reversal (T∶t → −t) symmetry, respectively. The metasources will be able to excite the mode pairs with the corresponding symmetry features.…”

Section: Introductionmentioning

confidence: 99%

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Anomalous unidirectional excitation of high-k hyperbolic modes using all-electric metasources

et al. 2021

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The unidirectional excitation of near-field optical modes is a fundamental prerequisite for many photonic applications, such as wireless power transfer and information communications. We experimentally construct all-electric Huygens and spin metasources and demonstrate anomalous unidirectional excitation of high-k hyperbolic modes in two types of hyperbolic metasurfaces. We use a Huygens metasource to study the unidirectional excitation of hyperbolic bulk modes in a planar hyperbolic metamaterial (HMM). Specifically, unidirectional excitation is the same as that in free space in the vertical direction, but opposite to that in free space in the horizontal direction. This anomalous unidirectional excitation is determined by the anisotropic HMM dispersion. In addition, we use a spin metasource to observe the anomalous photonic spin Hall effect in a planar hyperbolic waveguide. For a near-field source with a specific spin, the guide mode with a fixed directional wave vector is excited due to spin-momentum locking. Because the directions of momentum and energy flows in the HMM waveguide are opposite, the unidirectional excitation of hyperbolic guided modes is reversed. Our results not only uncover the sophisticated electromagnetic functionalities of metasources in the near-field but may also provide novel opportunities for the development of integrated optical devices.

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Section: Introductionmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 94%

Section: Unidirectional Excitations Of Hyperbolic Guided Modes Using a Spin Metasourcementioning

confidence: 99%

“…The external integrated electric circuits and extra TL systems are exploited to modulate the phase delays of the constituent dipoles. 33,49 These are marked by the red dots in Fig. 4(b).…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Anomalous unidirectional excitation of high-k hyperbolic modes using all-electric metasources

et al. 2021

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Miniaturized Backward Coupler Realized by the Circuit‐Based Planar Hyperbolic Waveguide

Guo

Song

Jiang

et al. 2021

Advanced Photonics Research

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Planar waveguides limit the transmission of electromagnetic waves in a specific direction and have a wide range of applications in filters, sensors, and energy‐transfer devices. However, given the increasing demand for planar‐integrated photonics, new waveguides are required with excellent characteristics such as more functionality, greater efficiency, and smaller size. Herein, the experimental results for a planar microwave‐regime waveguide fabricated from circuit‐based magnetic hyperbolic metamaterial (HMM) are reported. HMM is a special type of anisotropic metamaterial, whose isofrequency contour (IFC) takes the form of an open hyperboloid. Because of the open‐dispersion IFCs, HMMs support propagating high‐k modes with large effective refractive indices, which allow planar hyperbolic waveguides to be miniaturized. Especially, as opposed to the traditional dielectric slab waveguide, the group velocity and phase velocity in hyperbolic waveguides are oriented in opposite directions—a characteristic that is exploited to realize the backward propagation of electromagnetic waves. Based on this property, a backward coupler based on the hyperbolic waveguide is designed and experimented with. Herein, the significant potential of circuit‐based platforms for the experimental study of the propagation and coupling of guided modes is not only revealed but also the use of HMMs for numerous integrated functional devices is promoted.

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Polarization Rotator between the Linear Polarization and the Circular Polarization Based on the Layered Photonic Structure

Xing

Zhang

2022

Annalen der Physik

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A polarization rotator is investigated using a layered photonic structure composed of nonlinear media with the Kerr and single negative materials including epsilon-negative media and mu-negative media. Since the zero effective phase (expressed as zero-𝝋 eff ) bandgap formed by the alternating epsilon-negative media and mu-negative media has the characteristics of broadband phase retardation, as well as the nonlinear effect of the defect layer, the reflection phase difference and polarization form can be adjusted by the incident angle and light intensity. Studying the effect of those two parameters on reflectivity, reflection phase difference, and the polarization form under the forward and backward incidence, it is found that different incident directions can coherently tune the polarization form. By adjusting the incident angle and light intensity, the linear polarization can be converted to the left-handed circular polarization in the forward incidence, and it can be converted to the right-handed circular polarization in the backward incidence, thereby obtaining two different forms of circular polarization. Therefore, the different handed circularly polarized waves with relatively wide bandwidths can be obtained by changing the incident direction of electromagnetic waves, which provides the basis for tunable polarization selectors.

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Designing All-Electric Subwavelength Metasources for Near-Field Photonic Routings

Cited by 36 publications

References 41 publications

Anomalous unidirectional excitation of high-k hyperbolic modes using all-electric metasources

Anomalous unidirectional excitation of high-k hyperbolic modes using all-electric metasources

Miniaturized Backward Coupler Realized by the Circuit‐Based Planar Hyperbolic Waveguide

Polarization Rotator between the Linear Polarization and the Circular Polarization Based on the Layered Photonic Structure

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