Mirror-Image-Induced Magnetic Modes

Xifré-Pérez, Elisabet; Shi, Lei; Tuzer, Umut; Fenollosa, Roberto; Ramiro‐Manzano, Fernando; Quidant, Romain; Meseguer, F.

doi:10.1021/nn304855t

Cited by 66 publications

(96 citation statements)

References 38 publications

(63 reference statements)

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“…Here, we experimentally confirm this for the hybrid nanocavity by studying the RS from c‐Si NPs with different diameters placed on 60 nm Au film. For the wavelength of 632.8 nm used as a pump in Raman spectroscopy, NPs with diameters of 180 ± 10 and 250 ± 10 nm demonstrate in average 100‐fold enhancement for RS signal owing to the electric dipole (ED') and magnetic quadrupole (MQ') resonances modified by their mirror images (Figure c). It should be stressed that the obtained RS signal from the resonant c‐Si NPs on Au film is two order of magnitude higher than that of c‐Si NPs on glass at the same condition due to the greater values of both optical field enhancement and mode volume inside the NP, and also enhanced out‐coupling RS signal in backscattering geometry.…”

Section: Resultsmentioning

confidence: 99%

Metal‐Dielectric Nanocavity for Real‐Time Tracing Molecular Events with Temperature Feedback

Milichko

Zuev

Baranov

et al. 2017

Laser & Photonics Reviews

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Plasmonic nanoparticles coupled with metallic films forming nanometer scale cavities have recently emerged as a powerful tool for enhancement of light-matter interaction. Despite high efficiency for sensing and light emission, such nanocavities exhibit harmful and uncontrolled optical heating which limits the ranges of light intensities and working temperature. In contrast to plasmonic nanoparticles, all-dielectric counterparts possess low Ohmic losses, high temperature stability along with a strong temperature-dependent Raman response. Here, we demonstrate that a silicon nanoparticle coupled with a thin gold film can serve as a multifunctional metal-dielectric (hybrid) nanocavity operating up to 1200 K. Resonant interaction of light with such nanocavity enables molecular sensing, heat-induced molecular events (protein unfolding), and their real-time tracing with a nanoscale thermometry through the monitoring enhanced Raman scattering both from the nanoparticle and analyzed molecules. We model numerically the thermo-optical properties of the hybrid nanocavity and reveal two alternative regimes of operation -with and without strong optical heating while other functionalities are preserved. We believe that the concept of the multifunctional hybrid nanocavities holds great potential for diverse photochemical and photophysical applications.

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Section: Resultsmentioning

confidence: 99%

Metal‐Dielectric Nanocavity for Real‐Time Tracing Molecular Events with Temperature Feedback

Milichko

Zuev

Baranov

et al. 2017

Laser & Photonics Reviews

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“…[ 43 ] Placing resonators on a metal substrate, however, gives a full 2π phase shift due to interference with image modes in the substrate. [ 44 ] Unlike metallic resonators, these dielectric resonators have negligible losses (imaginary part of refractive index ≈ 10 −3 ). As a result, the refl ection has a near unity amplitude at all wavelengths, an ideal characteristic for a refl ect array metasurface.…”

Section: Full Paper Full Paper Full Papermentioning

confidence: 99%

Electrically Reconfigurable Metasurfaces Using Heterojunction Resonators

Iyer

Pendharkar

Schuller

2016

Advanced Optical Materials

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paradigm in reconfi gurable metasurfacebased optics. Here, we use electromagnetics and device simulations to design electrically pumped semiconductor heterostructure resonators capable of arbitrarily tuning the refl ection phase of infrared light with little change in amplitude.Previous approaches for tuning metasurfaces-using metallic resonators coupled to an index tunable background [ 8,[23][24][25][26][27][28] or mechanically changing the shape of metallic resonators [ 5,29,30 ] have been unable to achieve reconfi gurable 2π phase shifts. This inability to achieve 2π phase control stems fundamentally from the nature of the underlying optical antennas. Because the light-matter interaction lengths are subwavelength and the quality factors modest ( Q ≈ 1−10), very large refractive index modulation is needed (Δ n ≥ 1). InSb [31][32][33] or InAs [ 27,34,35 ] support free-carrier index shifts of this magnitude due to their high mobility and low electron effective mass. In our previous theory work, [ 36 ] we demonstrated full 2π tuning of the transmission phase of semiconductor metasurface by modulating the carrier concentration in InSb resonators between 10 17 -10 18 cm −3 . However, we did not consider how to achieve such modulation. Here, we use combined electromagnetic [ 37 ] and device simulations to demonstrate subwavelength 1D heterojunction device resonators with electrically reconfi gurable refl ection phase. We fi rst demonstrate a new resonator geometry that allows for integration of metal electrodes with dielectric-type Mie resonances. Subsequently, we incorporate an InSb based heterojunction device layer into the resonator architecture. This novel device design employs electron and hole blocking layers to achieve large modulations of carrier concentration over electrically large dimensions, enabling near-2π tuning of refl ection phase with minimal changes in refl ection amplitude. Finally, we demonstrate fully continuous and tunable steering of high-quality narrow, diffraction lobes in resonator arrays. Results and DiscussionGiven the need for integrating top and bottom electrical contacts, our basic metasurface element is a modifi ed version of a 1D "strip" resonator sitting atop a refl ecting back electrode shown in

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“…The solutions for this problem proposed earlier , albeit finding their applications for modelling the near‐field of low‐index nanoparticles on metallic substrates , involve laborious calculations. Thus, most of the analysis of the scattering of nanoparticles on substrates tends to be either qualitative or based on finite element methods . A promising analytical model was proposed recently in the work by Miroshnichenko et al.…”

Section: Introductionmentioning

confidence: 99%

Polarization control over electric and magnetic dipole resonances of dielectric nanoparticles on metallic films

Sinev

Iorsh

Bogdanov

et al. 2016

Laser & Photonics Reviews

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We reveal unusually strong polarization sensitivity of electric and magnetic dipole resonances of high‐index dielectric nanoparticles placed on a metallic film. By employing dark‐field spectroscopy, we observe the polarization‐controlled transformation from high‐Q magnetic‐dipole scattering to broadband suppression of scattering associated with the electric dipole mode, and show numerically that it is accompanied by a strong enhancement of the respective fields by the nanoparticle. Our experimental data for silicon nanospheres are in an excellent agreement with both analytical calculations based on Green's function approach and the full‐wave numerical simulations. Our findings further substantiate dielectric nanoparticles as strong candidates for many applications in enhanced sensing, spectroscopy and nonlinear processes at the nanoscale.

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Mirror-Image-Induced Magnetic Modes

Cited by 66 publications

References 38 publications

Metal‐Dielectric Nanocavity for Real‐Time Tracing Molecular Events with Temperature Feedback

Metal‐Dielectric Nanocavity for Real‐Time Tracing Molecular Events with Temperature Feedback

Electrically Reconfigurable Metasurfaces Using Heterojunction Resonators

Polarization control over electric and magnetic dipole resonances of dielectric nanoparticles on metallic films

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