Hybridizing whispering gallery modes and plasmonic resonances in a photonic metadevice for biosensing applications [Invited]

Klusmann, Carolin; Suryadharma, Radius N. S.; Oppermann, Jens; Rockstuhl, Carsten; Kalt, H.

doi:10.1364/josab.34.000d46

Cited by 9 publications

(6 citation statements)

References 43 publications

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“…For example, a photonic crystal cavity coupled to a metal nanoantenna was introduced to possess a strong efficiency for photonic trapping by making use of some remarkable optical properties [48,49]. Moreover, hybridizing WGMs and plasmonic resonances in compact photonic-plasmonic devices were unveiled to have controllable optical sensitivity for biological applications based on wavelength detuning between the WGMs and the plasmonic resonance [50,51].…”

Section: Resultsmentioning

confidence: 99%

Enhanced light–matter interaction in a hybrid photonic–plasmonic cavity

et al. 2021

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Strongly concentrated optical fields around a metal nanoparticle in the close vicinity of a dipole noticeably facilitate dramatic changes in the localized density of states due to hybrid photonic-plasmonic mode couplings as compared to that of the pure cavity mode fields. Significant variations of the field intensity in the presence of the metal nanoparticle elucidate enhanced light-matter interaction in a hybrid structure. The enhancement factor of the light-matter interaction is studied through the single-atom cooperativity parameter, which is directly proportional to the ratio of the fluorescence lifetimes of the off-resonant and on-resonant emission. A compact and cost-effective hybrid device, which includes a microfiber cavity, supporting whispering gallery modes, and a well-defined solid nanostructure, consisting of a gold nanoparticle core, overcoated by a silica shell, and decorated with CdS/CdSe quantum dots, is demonstrated to offer an outstanding potential for the enhancement of light-matter interaction. Surface plasmons of a gold nanoparticle, placed inside a hollow cylindrical nanostructure at the surface of a microfiber, are activated upon excitation of the dipoles of the quantum emitters, which are on-resonance with the whispering gallery mode. Time-resolved experiments demonstrate that the single-atom cooperativity parameter of the quantum dots is enhanced by a factor of about 4.8 in the presence of the gold nanoparticle being simultaneously in strong interaction with the cavity mode field and the metal nanoparticle's surface plasmons.

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Section: Resultsmentioning

confidence: 99%

Enhanced light–matter interaction in a hybrid photonic–plasmonic cavity

et al. 2021

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“…In the last few years, hybrid photonic-plasmonic cavities have been introduced as novel systems providing large F p as they can potentially combine the best of both worlds: high Q-factor values due to the dielectric photonic cavity and small mode volumes thanks to the metallic NP [11,[13][14][15][16][17][18][19][20][21][22]. Indeed, by modifying the coupling between photonic and plasmonic modes, the Qfactor and V m can be tuned between the values of the bare NP and the cavity [17].…”

Section: Introduction \\mentioning

confidence: 99%

Hybrid photonic-plasmonic cavity design for very large Purcell factors at telecom wavelengths

Barreda¹,

Pinilla-Cienfuegos²,

Zapara-Herrera³

et al. 2022

Preprint

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Hybrid photonic-plasmonic cavities can be tailored to display high Q-factors and extremely small mode volumes simultaneously, which results in large values of the Purcell factor, FP. Amongst the different hybrid configurations, those based on a nanoparticle-on-a-mirror (NPoM) plasmonic cavity provide one of the lowest mode volumes, though so far their operation has been constrained to wavelengths below 1 µm. Here, we propose a hybrid configuration consisting of a silicon photonic crystal cavity with a slot at its center in which a gold nanoparticle is introduced. This hybrid system operates at telecom wavelengths and provides high Q-factor values (Q ≈ 10 5 ) and small normalized mode volumes (Vm ≈ 10 −4 ), leading to extremely large Purcell factor values, FP ≈ 10 7 − 10 8 . The proposed cavity could be used in different applications such as molecular optomechanics, bio-and chemo-sensing, all-optical signal processing or enhanced Raman spectroscopy in the relevant telecom wavelength regime.

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“…Conversely, extreme subwavelength spatial confinement in nm-scale plasmonic gaps comes at the cost of very short photon lifetimes, thus reducing the Q-factor. 8,9 In the last few years, hybrid plasmonic-photonic cavities 8,[10][11][12][13][14][15][16] have emerged as a promising way of mixing both types of confinement approaches, taking advantage of the idea of placing a gap plasmonic nanoantenna in a large field confinement region of a dielectric cavity where both modes, plasmonic and photonic, can hybridize. This results in new features not attainable by either plasmonic or photonic cavities when operating individually.…”

Section: Introductionmentioning

confidence: 99%

Hybrid photonic-plasmonic cavities based on the nanoparticle-on-a-mirror configuration

et al. 2021

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Hybrid photonic-plasmonic cavities have emerged as a new platform to increase light-matter interaction capable to enhance the Purcell factor in a singular way not attainable with either photonic or plasmonic cavities separately. In the hybrid cavities proposed so far, the plasmonic element is usually a metallic bow-tie antenna, so the plasmonic gap-defined by lithography-is limited to minimum values of several nanometers. Nanoparticleon-a-mirror (NPoM) cavities are far superior to achieve the smallest possible mode volumes, as plasmonic gaps smaller than 1 nm can be created. Here, we design a hybrid cavity that combines an NPoM plasmonic cavity and a dielectric-nanobeam photonic crystal cavity operating at transverse-magnetic polarization. The metallic nanoparticle can be placed very close (<1 nm) to the upper surface of the dielectric cavity, which acts as a low-reflectivity mirror. We demonstrate through numerical calculations of the local density of states that this hybrid plasmonicphotonic cavity exhibits quality factors Q above 10 3 and normalized mode volumes V down to 10 −3 , thus resulting in high Purcell factors (F P ≈ 10 5 ), while being experimentally feasible with current technology. Our results suggest that hybrid cavities with sub-nanometer gaps should open new avenues for boosting light-matter interaction in nanophotonic systems.

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Hybridizing whispering gallery modes and plasmonic resonances in a photonic metadevice for biosensing applications [Invited]

Cited by 9 publications

References 43 publications

Enhanced light–matter interaction in a hybrid photonic–plasmonic cavity

Enhanced light–matter interaction in a hybrid photonic–plasmonic cavity

Hybrid photonic-plasmonic cavity design for very large Purcell factors at telecom wavelengths

Hybrid photonic-plasmonic cavities based on the nanoparticle-on-a-mirror configuration

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