Integrated metaphotonics: symmetries and confined excitation of LSP resonances in a single metallic nanoparticle

Tellez-Limon, Ricardo; Bahari, Babak; Hsu, Li-Yi; Park, Jun‐Hee; Kodigala, Ashok; Kanté, Boubacar

doi:10.1364/oe.24.013875

Cited by 8 publications

(6 citation statements)

References 21 publications

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“…This greatly exceeds previous approaches in which the nanoantenna is placed on top of the waveguide, for which the intensity modulation is always lower than 20% even when using silicon nitride waveguides with poorer mode confinement. 17,18 Discrepancies between simulations and experiments, more evident at short wavelengths, could be due to excitation of higher-order plasmonic modes in the nanoantenna as well inter-modal conversion, 19 which are not considered in our model. We plan to conduct future work to study such phenomena.…”

Section: Resultsmentioning

confidence: 92%

Coherent Control of a Plasmonic Nanoantenna Integrated on a Silicon Chip

et al. 2018

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Illuminating a plasmonic nanoantenna by a set of coherent light beams should tremendously modify its scattering, absorption and polarization properties, thus enabling all-optical dynamic manipulation. However, diffraction inherently makes coherent control of isolated subwavelength-sized nanoantennas highly challenging when illuminated from free-space. Here, we overcome this limitation by placing the nanoantenna at a subwavelength distance of the output facet of silicon waveguides that provide monolithically-defined paths for multibeam coherent illumination. Inspired by coherent perfect absorption (CPA) concepts, we demonstrate experimentally modulation of the nanoantenna scattering by more than one order of magnitude and of the on-chip transmission by >50% over a ~200 nm bandwidth at telecom wavelengths by changing the phase between two counter-directional coherent guided beams. Moreover, we demonstrate coherent synthesis of polarization of the radiated field by illuminating the nanoantenna from orthogonal waveguides. Our finding paves the way towards coherent manipulation of nanoantennas and all-optical processing without nonlinearities in an integrated platform.

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Section: Resultsmentioning

confidence: 92%

Coherent Control of a Plasmonic Nanoantenna Integrated on a Silicon Chip

et al. 2018

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“…We measured the transmission spectra for the modes propagating through the waveguide when the short NP (

nm) was placed in the core and laterally shifted along the x axis by a distance

nm, measured from the center of the core to the center of the NP ( Figure 1 b). As demonstrated in reference [ 41 ], due to the mode symmetry and geometry of the NP, only TE

and TE

modes excite plasmonic resonances for this NP in the spectral range of interest. The transmission spectra for TE

and TE

modes are shown in Figure 3 a,b, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…The width of the NPs was tuned such that the wavelength of the dipolar resonance of the short NP laterally shifted was close to that of the quadrupolar resonance of the long NP at the center of the waveguide. The height and length were the same for both NPs and as these dimensions are too short, no LSP resonance was excited for the TM

or TM

modes [ 41 ].…”

Section: Discussionmentioning

confidence: 99%

“…Another possibility to induce plasmonic transparencies is by fully embedding nanoparticles (NPs) in the core of the waveguide and taking advantage of the symmetry of the guided modes to excite LSP resonances. These confined architectures reduce scattering losses and increase the contrast of dips in the transmission lines [ 41 , 42 , 43 , 44 ]. However, they have not been exploited for the generation of plasmonic transparency windows.…”

Section: Introductionmentioning

confidence: 99%

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Plasmonic-Induced Transparencies in an Integrated Metaphotonic System

et al. 2022

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In this contribution, we numerically demonstrate the generation of plasmonic transparency windows in the transmission spectrum of an integrated metaphotonic device. The hybrid photonic–plasmonic structure consists of two rectangular-shaped gold nanoparticles fully embedded in the core of a multimode dielectric optical waveguide, with their major axis aligned to the electric field lines of transverse electric guided modes. We show that these transparencies arise from different phenomena depending on the symmetry of the guided modes. For the TE0 mode, the quadrupolar and dipolar plasmonic resonances of the nanoparticles are weakly coupled, and the transparency window is due to the plasmonic analogue of electromagnetically induced transparency. For the TE1 mode, the quadrupolar and dipolar resonances of the nanoparticles are strongly coupled, and the transparency is originated from the classical analogue of the Autler–Townes effect. This analysis contributes to the understanding of plasmonic transparency windows, opening new perspectives in the design of on-chip devices for optical communications, sensing, and signal filtering applications.

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“…In recent years, several integrated optical devices have been successfully used to excite light sources with dimensions of a few nanometers. Some examples are the excitation of nanoemitters by surface plasmon polaritons (SPPs) [16], localized surface plasmons in nanoantennas [17][18][19], optical cavities [20,21], nanocrystals, [22,23] nanowires [24][25][26], and metallic waveguides [27][28][29]. However, despite the fact that the absorption/emission wavelengths of the nanoemitters used in these works rely on the visible spectrum (CdSe or CdS quantum dots and nitrogen vacancy centers in diamond), the materials used for their excitation have high losses in this spectral range (silicon and noble metals).…”

Section: Introductionmentioning

confidence: 99%

Hybrid integrated optical waveguides in glass for enhanced visible photoluminescence of nanoemitters

et al. 2016

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Integrated optical devices able to control light-matter interactions on the nanoscale have attracted the attention of the scientific community in recent years. However, most of these devices are based on silicon waveguides, limiting their use for telecommunication wavelengths. In this contribution, we propose an integrated device that operates with light in the visible spectrum. The proposed device is a hybrid structure consisting of a high-refractive-index layer placed on top of an ion-exchanged glass waveguide. We demonstrate that this hybrid structure serves as an efficient light coupler for the excitation of nanoemitters. The numerical and experimental results show that the device can enhance the electromagnetic field confinement up to 11 times, allowing a higher photoluminescence signal from nanocrystals placed on its surface. The designed device opens new perspectives in the generation of new optical devices suitable for quantum information or for optical sensing.

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Integrated metaphotonics: symmetries and confined excitation of LSP resonances in a single metallic nanoparticle

Cited by 8 publications

References 21 publications

Coherent Control of a Plasmonic Nanoantenna Integrated on a Silicon Chip

Coherent Control of a Plasmonic Nanoantenna Integrated on a Silicon Chip

Plasmonic-Induced Transparencies in an Integrated Metaphotonic System

Hybrid integrated optical waveguides in glass for enhanced visible photoluminescence of nanoemitters

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