Nanointerferometric Discrimination of the Spin–Orbit Hall Effect

Zhang, Mingsi; Ren, Haoran; Ouyang, Xu; Jiang, Meiling; Lu, Yudong; Hu, Yanwen; Fu, Shenhe; Li, Zhen; Chen, Zhenqiang; Guan, Bai‐Ou; Li, Xiangping

doi:10.1021/acsphotonics.1c00087

Cited by 14 publications

(10 citation statements)

References 32 publications

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“…The intrinsic orbital angular momentum (OAM) possessed by a helical wavefront has a theoretically unbounded set of orthogonal modes that could carry independent information channels. In addition to its fundamental role in light–matter interactions, − OAM offers a promising approach to greatly improving the capacity of optical devices and systems. − OAM multiplexing has thus been exploited to increase the telecommunication bandwidth for both free-space and fiber-optic networks, to enhance the security of quantum entanglement, and to improve the capacity of holograms. ,− To realize OAM multiplexing, three schemes have been developed to sort and detect OAM modes, including mode interference in real space, spatial filtering in momentum space, and log-polar , or Laguerre–Gaussian mode transformation. However, these far-field approaches require a large propagation distance to produce OAM-distinct diffraction patterns, restricting the OAM detection to diffraction-limited optical systems that hinder OAM applications for integrated photonics.…”

Section: Introductionmentioning

confidence: 77%

Orbital-Angular-Momentum-Controlled Hybrid Nanowire Circuit

Ren

Wang

et al. 2021

Nano Lett.

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Plasmonic nanostructures can enable compact multiplexing of the orbital angular momentum (OAM) of light; however, strong dissipation of the highly localized OAM-distinct plasmonic fields in the near-field region hinders on-chip OAM transmission and processing. Superior transmission efficiency is offered by semiconductor nanowires sustaining highly confined optical modes, but only the polarization degree of freedom has been utilized for their selective excitation. Here we demonstrate that incident OAM beams can selectively excite single-crystalline cadmium sulfide (CdS) nanowires through coupling OAM-distinct plasmonic fields into nanowire waveguides for long-distance transportation. This allows us to build an OAM-controlled hybrid nanowire circuit for optical logic operations including AND and OR gates. In addition, this circuit enables the on-chip photoluminescence readout of OAM-encrypted information. Our results open exciting new avenues not only for nanowire photonics to develop OAM-controlled optical switches, logic gates, and modulators but also for OAM photonics to build ultracompact photonic circuits for information processing.

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Section: Introductionmentioning

confidence: 77%

Orbital-Angular-Momentum-Controlled Hybrid Nanowire Circuit

Ren

Wang

et al. 2021

Nano Lett.

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“…This effect is quite surprising, because it appears in free space, and under paraxial condition, contrary to those optical Hall effects. [15][16][17][18][19]37,38] which require light-matter interactions or take place under tightly focusing conditions. It is emphasized that this intriguing orbital Hall effect cannot be observed by a single vortex-antivortex pair as illustrated in Figure 3.…”

Section: Resultsmentioning

confidence: 99%

Intrinsic Vortex–Antivortex Interaction of Light

Lin

Yin

et al. 2022

Laser & Photonics Reviews

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The spin-orbit interaction and the extrinsic orbit-orbit interaction of light have been thoroughly studied, which have led to important phenomena including the spin Hall effect, orbital Hall effect, and spin-orbit Hall effect of light. Nevertheless, the concept of optical intrinsic orbit-orbit interaction, which is named as vortex-antivortex interaction, is scarcely known to the authors knowledge. Here, such a novel interaction process is theoretically and experimentally demonstrated, which emerges due to mutual interplays among reciprocal helicities of singular cores in a freely propagating light field. A general model describing the process is presented, which includes a linearly independent term and a nonlinearly coupling term. It is revealed that the strong coupling leads to intuitive mutual attraction between two reciprocal vortices, while the weak coupling, in contrast, results in a counterintuitive repulsive phenomenon. The vortex-antivortex interaction enables the predictions and observations of the orbital angular momentum Hall effect, as well as the stable propagation of an appropriately structured vortex arrays without nonlinear light-matter interactions. The results expand the scope of interaction processes among different forms of optical angular momenta, and open opportunities for studies of new effects using the presented coupling mechanism.

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“…Plasmonics breaks the diffraction limit by allowing subwavelength localization of light, bridging the size mismatch between high-capacity photonics and nanoscale electronics. [45,79,80] Nanoplasmonic detection [38][39][40][41][42][43][81][82][83][84] of OAM modes have recently been achieved through plasmonic structures designed to couple incident OAM beams into distinctive plasmonic fields. For example, a plasmonic OAM photodiode has been designed to detect a single OAM mode based on the principle of near-field holography, through the interference of focused surface plasmon polaritons and an incident optical vortex field.…”

Section: Oam Detection In Nanophotonicsmentioning

confidence: 99%

Nanophotonic Materials for Twisted‐Light Manipulation

Ren

Maier

2022

Advanced Materials

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Twisted light, an unbounded set of helical spatial modes carrying orbital angular momentum (OAM), offers not only fundamental new insights into structured light–matter interactions, but also a new degree of freedom to boost optical and quantum information capacity. However, current OAM experiments still rely on bulky, expensive, and slow‐response diffractive or refractive optical elements, hindering today's OAM systems to be largely deployed. In the last decade, nanophotonics has transformed the photonic design and unveiled a diverse range of compact and multifunctional nanophotonic devices harnessing the generation and detection of OAM modes. Recent metasurface devices developed for OAM generation in both real and momentum space, presenting design principle and exemplary devices, are summarized. Moreover, recent development of whispering‐gallery‐mode‐based passive and tunable microcavities, capable of extracting degenerate OAM modes for on‐chip vortex emission and lasing, is summarized. In addition, the design principle of different plasmonic devices and photodetectors recently developed for on‐chip OAM detection is discussed. Current challenges faced by the nanophotonic field for twisted‐light manipulation and future advances to meet these challenges are further discussed. It is believed that twisted‐light manipulation in nanophotonics will continue to make significant impact on future development of ultracompact, ultrahigh‐capacity, and ultrahigh‐speed OAM systems‐on‐a‐chip.

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Nanointerferometric Discrimination of the Spin–Orbit Hall Effect

Cited by 14 publications

References 32 publications

Orbital-Angular-Momentum-Controlled Hybrid Nanowire Circuit

Orbital-Angular-Momentum-Controlled Hybrid Nanowire Circuit

Intrinsic Vortex–Antivortex Interaction of Light

Nanophotonic Materials for Twisted‐Light Manipulation

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