Low loss waveguiding and slow light modes in coupled subwavelength silicon Mie resonators

Liu, Ding; Yu, Yi; Morits, Dmitry; Yu, Mingbin; Ang, Thomas Y. L.; Chu, Hong‒Son; Lim, Soon Thor; Png, Ching Eng; Paniagua‐Domínguez, Ramón; Кузнецов, А. И.

doi:10.1039/d0nr05248e

Cited by 16 publications

(15 citation statements)

References 51 publications

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“…When a = 2.15 R , the metachain consisting of SDs with G = 0.5 R has the lowest α = 0.022 and that consisting of SDs with G = 0.9 R has the largest α = 0.507, which agree with the electric-field distributions in Figure a. The mechanism of long-range energy transfer in metachains is similar to previous studies based on magnetic mode coupling, − whereas the different performances of metachains prove the vital value of the nonradiative resonant to transmission. Meanwhile, we notice that the SD with the G = 0.9 R metachain has higher efficiency when a is larger, indicating a limited tuning effect from the periodicity.…”

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confidence: 86%

Ultracompact Energy Transfer in Anapole-based Metachains

et al. 2021

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Realization of electromagnetic energy confinement beyond the diffraction limit is crucial for high-performance on-chip devices. Herein we construct an array of nonradiative anapoles that originate from the destructive far-field interference of electric and toroidal dipole modes to achieve ultracompact and high-efficiency electromagnetic energy transfer without the coupler. We experimentally investigate the proposed metachain at mid-infrared frequencies and give the first near-field experimental evidence of anapole-based energy transfer, in which the spatial profile of the anapole mode is also unambiguously identified on the nanoscale. We further demonstrate that the metachain is intrinsically lossless and scalable at infrared wavelengths, realizing a 90°bending loss down to 0.32 dB at the optical communication wavelength. The present scheme bridges the gap between the energy confinement and the transfer of anapoles and opens a new gate for more compactly integrated photonic and energy devices, which can operate in a broad spectral range.

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confidence: 86%

Ultracompact Energy Transfer in Anapole-based Metachains

et al. 2021

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“…An experimental study of metal particle arrays revealed the effects of collective lattice resonances which provide laser generation 17 , 18 , biosensing applications 19 , 20 and amplification of light radiation 21 – 23 . In addition to creating antireflection coatings, arrays of ordered dielectric particles can be used in optical waveguides 24 , 25 and also as metasurfaces and metamaterials 23 , 26 . Particular attention is paid to the study of the interaction of resonant modes, excited in individual dielectric particles, with lattice modes.…”

Section: Introductionmentioning

confidence: 99%

Interdisk spacing effect on resonant properties of Ge disk lattices on Si substrates

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Tsarev

et al. 2022

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The light reflection properties of Ge disk lattices on Si substrates are studied as a function of the disk height and the gap width between disks. The interdisk spacing effect is observed even at such large gap widths as 500 nm. The gap width decrease leads to the appearance of the reflection minimum in the short wavelength region relative to one originated from the magnetic and electric dipole resonances in individual Ge disks, thereby essentially widening the antireflection properties. This minimum becomes significantly deeper at small gap widths. The observed behavior is associated with the features of the resonant fields around closely spaced disks according to numerical simulation data. The result shows the importance of using structures with geometrical parameters providing the short-wavelength minimum. This can essentially enhance their other resonant properties, which are widely used for applications, in particular, based on collective lattice resonances.

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“…This is the first time that such an extended array of coupled resonators comprising up to 18,000 coupled Mie-resonant NPs is reported, with the measured loss value unprecedented for resonant arrays and comparable to conventional SWG waveguides 13 . While earlier work 46 reported slightly lower losses, note that the silicon NP chains investigated in there operate in the subwavelength regime below the bandgap thus are fundamentally SWG waveguides 14 , unlike our NP chains operating above the bandgap. (where c is the speed of the light in the vacuum, ng is the group index, and L is the geometrical path difference between the MZI arms).…”

Section: Experimental Demonstrationmentioning

confidence: 51%

All-dielectric Huygens’ meta-waveguides for resonant integrated photonics

Sırmacı

Gomez

Pertsch

et al. 2022

Preprint

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The growing maturity of nanofabrication technology has recently enabled the deployment of high-quality subwavelength nanostructures on photonic chips. A combination of existing photonic waveguide technology with nanophotonics and paradigms adapted from the field of optical metamaterials opens new avenues towards photonic integrated circuits providing unprecedented control of guided light waves. However, developing new functionalities while preserving both compatibility with current technology and the efficiencies required by existing and emerging applications remains a major challenge in on-chip nanophotonics. Here, we propose and demonstrate a radically new type of silicon nanophotonic waveguide consisting of a chain of resonantly forward scattering nanoparticles empowered by spectrally overlapping electric and magnetic dipolar Mie-type resonances. The propagation loss of the realized meta-waveguides in the telecom spectral range is as low as 0.4 dB/mm, exceeding the current record for Mie-resonant waveguides by more than an order of magnitude. Furthermore, the meta-waveguides support a negative group index over a broad spectral range of 60 nm and several millimeters of propagation distance, as well as regions of vanishing and anomalous dispersion within the transmission band. Finally, we show that meta-waveguide architectures composed of resonantly forward scattering nanoparticles can implement sharp bends with bending radii below 3 µm, and efficiently split the input signal within just 315 nm propagation length. Our work does not only contribute to addressing the challenges of miniaturization, dispersion and scattering control in on-chip photonics, but furthermore opens up completely new opportunities for enhanced light-matter interactions, interfacing with nanophotonic components, as well as nonlinear, ultrafast and quantum optics in resonant integrated light-guiding architectures.

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Low loss waveguiding and slow light modes in coupled subwavelength silicon Mie resonators

Abstract: Subwavelength light-guiding optical devices have gained great attention in the photonics community because they provide unique opportunities for miniaturization and functionality of the optical interconnect technology. On the other hand,...

Cited by 16 publications

References 51 publications

Ultracompact Energy Transfer in Anapole-based Metachains

Ultracompact Energy Transfer in Anapole-based Metachains

Interdisk spacing effect on resonant properties of Ge disk lattices on Si substrates

All-dielectric Huygens’ meta-waveguides for resonant integrated photonics

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