On-Chip Orbital Angular Momentum Sorting With a Surface Plasmon Polariton Lens

Ye, Jingfu; Li, Yan; Qu, Shiliang

doi:10.1109/jlt.2020.3039270

Cited by 8 publications

(7 citation statements)

References 38 publications

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“…It should be mentioned that a similar idea of coupling the OAM-distinct surface waves into waveguide channels was recently proposed in a simulation-only paper. 54 To experimentally confirm the OAM-selective excitation of nanowires, we used the focused ion beam technique to engrave the designed semi-circle-shaped nanogroove grating in a gold thin film. (See the Materials and Methods section.)…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…On the contrary, the E x component of the plasmonic fields, which is dominant for the excitation of the transverse magnetic (TM) waveguide mode for nanowires with a small splitting angle (15° with respect to the y axis), shows weak coupling strength due to the y linear polarized incident light. It should be mentioned that a similar idea of coupling the OAM-distinct surface waves into waveguide channels was recently proposed in a simulation-only paper …”

Section: Resultsmentioning

confidence: 99%

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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: ■ Results and Discussionmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Orbital-Angular-Momentum-Controlled Hybrid Nanowire Circuit

Ren

Wang

et al. 2021

Nano Lett.

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“…The continued pursuit in highly integrated nanophotonic circuits has fueled the flourishing of surface plasmon polaritons (SPPs) (electromagnetic waves coupled to collective oscillations of free electrons in a conductor) 19 – 21 because they can circumvent the diffraction limit and confine light to deep subwavelength scales, enabling nanoscale optoelectronic components. With the rapid development of material science and nanofabrication, many photonic functionalities based on the on-chip focusing of the SPPs supported by the graded-index waveguide structures have been realized, such as the sorting of the orbital angular momentum of light, 22 , 23 the manipulation of the longitudinal trajectory of the beam, 24 , 25 and the spatiotemporal operation of optical pulses 26 , 27 . Nonetheless, the on-chip focusing of the SPPs still faces a formidable challenge of the severe chromatic aberration due to the inherent strong wavelength dispersion of plasmonic materials, which limits its further applications in the multicolor manipulation and broadband operation.…”

Section: Introductionmentioning

confidence: 99%

Achromatic on-chip focusing of graphene plasmons for spatial inversions of broadband digital optical signals

2023

Adv. Photon. Nexus

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.On-chip focusing of plasmons in graded-index lenses is important for imaging, lithography, signal processing, and optical interconnects at the deep subwavelength nanoscale. However, owing to the inherent strong wavelength dispersion of plasmonic materials, the on-chip focusing of plasmons suffers from severe chromatic aberrations. With the well-established planar dielectric grating, a graded-index waveguide array lens (GIWAL) is proposed to support the excitation and propagation of acoustic graphene plasmon polaritons (AGPPs) and to achieve the achromatic on-chip focusing of the AGPPs with a focus as small as about 2% of the operating wavelength in the frequency band from 10 to 20 THz, benefiting from the wavelength-independent index profile of the GIWAL. An analytical theory is provided to understand the on-chip focusing of the AGPPs and other beam evolution behaviors, such as self-focusing, self-collimation, and pendulum effects of Gaussian beams as well as spatial inversions of digital optical signals. Furthermore, the possibility of the GIWAL to invert spatially broadband digital optical signals is demonstrated, indicating the potential value of the GIWAL in broadband digital communication and signal processing.

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“…15 To date this problem has been addressed only for routing of free-space vortex beams on a chip. 16 Here we propose a compact solution, embedded on a chip, for sorting and coupling of planar beams with different spatial wavefronts. Specifically, we experimentally demonstrate demultiplexer devices for HG plasmonic beams.…”

mentioning

confidence: 99%

“…Beam sorting has been developed for free-space systems, − waveguide-integrated configurations, − and fiber communication systems, but the requirement to process and transmit signals at the chip level necessitates extending these sorting capabilities to planar integrated optical devices . To date this problem has been addressed only for routing of free-space vortex beams on a chip …”

mentioning

confidence: 99%