Toggling Near‐Field Directionality via Polarization Control of Surface Waves

Zhong, Yuhan; Lin, Xiao; Jiang, Jing; Yang, Yi; Liu, Gui Geng; Xue, Haoran; Low, Tony; Chen, Hongsheng; Zhang, Baile

doi:10.1002/lpor.202000388

Cited by 26 publications

(10 citation statements)

References 66 publications

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“…Our results not only clearly show the interesting near-field unidirectional emissions of the Huygens metasource in HMMs and spin metasources in hyperbolic waveguides, but also provide a flexible platform for the construction of more complex composite metasources. Related designs can be extended to the fields of natural 2D materials 51,52 and acoustics systems. 31,53,54 2 Unidirectional Excitation of Hyperbolic Bulk Modes Using a Huygens Metasource…”

Section: Introductionmentioning

confidence: 99%

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: 99%

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

et al. 2021

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“…[33], the transmitted light through chiral interfaces, such as atomic bilayers with a Moiré superlattice [34,35], can always have polarization different from that of the incident light. Our work, then, should inspire the search for other exotic photonic spin Hall effects in emerging material systems [32,[36][37][38][39], such as those with Moiré superlattices [40][41][42]. We assume the region (e.g., free space with gases with different densities) above the uniaxial epsilon-near-zero medium has a refractive index of 1 + n. The other setup is the same as that in Fig.…”

Section: Discussionmentioning

confidence: 99%

Wide-angle giant photonic spin Hall effect

Chen

et al. 2022

Phys. Rev. B

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The photonic spin Hall effect is a manifestation of the spin-orbit interaction of light and can be measured by a transverse shift δ of photons with opposite spins. The precise measurement of transverse shifts can enable many spin-related applications, such as precise metrology and optical sensing. However, this transverse shift is generally small (i.e., δ/λ < 10 −1 , where λ is the wavelength), which impedes its precise measurement. To date, proposals to generate a giant spin Hall effect (namely, with δ/λ > 10 2 ) have severe limitations, particularly its occurrence only over a narrow angular cone (with a width of θ < 1 • ). Here we propose a universal scheme to realize the wide-angle giant photonic spin Hall effect with θ > 70 • by exploiting the interface between free space and uniaxial epsilon-near-zero media. The underlying mechanism is ascribed to the almost-perfect polarization splitting between s and p polarized waves at the designed interface. Remarkably, this almost-perfect polarization splitting does not resort to the interference effect and is insensitive to the incident angle, which then gives rise to the wide-angle giant photonic spin Hall effect.

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“…The researchers have been pursuing more ways to enrich the functions of the metasurface. Encouragingly, the reconfigurable metasurface employing active methods, including diodes, − phase change materials, , graphene, − and brainwave control, , empowers more freedom for manipulating EM waves. Most of the above-mentioned multifarious functions achieved on the metasurface are based on amplitude, phase, and polarization control.…”

Section: Introductionmentioning

confidence: 99%

Smart Metasurface for Active and Passive Cooperative Manipulation of Electromagnetic Waves

Jiang

Zheng

et al. 2022

ACS Appl. Mater. Interfaces

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Integrating active and passive manipulation of electromagnetic (EM) waves has significant advantages for the caliber synthesis of microwave and optical integrated devices. In previous schemes, most reported designs focus only on active ways of manipulating self-radiating EM waves, such as antennas and lasers, or passive ways of manipulating external incident EM waves, such as lenses and photonic crystals. Here, we proposed a paradigm that integrates active and passive manipulation of EM waves in a reconfigurable way. As demonstrated, circularly polarized, linearly polarized, and elliptically polarized waves with customized beams are achieved in passive operation by merging Pancharatnam−Berry phases and dynamic phases, while the radiating EM waves with a customized gain are achieved by coupling the coding elements with the radiation structure in the active manipulation. Either active or passive manipulation is determined by the sensed signals and operating state to reduce detectability. Encouragingly, the proposed strategy will excite new sensing and communication opportunities, enabling advanced conceptions for next-generation compact EM devices.

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Toggling Near‐Field Directionality via Polarization Control of Surface Waves

Cited by 26 publications

References 66 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

Wide-angle giant photonic spin Hall effect

Smart Metasurface for Active and Passive Cooperative Manipulation of Electromagnetic Waves

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