Subwavelength waveguides composed of dielectric nanoparticles

Savelev, Roman S.; Slobozhanyuk, Alexey P.; Miroshnichenko, Andrey E.; Kivshar, Yuri S.; Belov, Pavel A.

doi:10.1103/physrevb.89.035435

Cited by 90 publications

(132 citation statements)

References 74 publications

(102 reference statements)

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“…The coupled dipole approximation outlined above is justified for the geometrical parameters of the nanoparticles and their relative distance [34]. The solution of Eq.…”

Section: Resultsmentioning

confidence: 99%

All-Optical Switching and Unidirectional Plasmon Launching with Nonlinear Dielectric Nanoantennas

Krasnok

Lepeshov

et al. 2018

Phys. Rev. Applied

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High-index dielectric nanoparticles have become a powerful platform for modern light science, enabling various fascinating applications, especially in nonlinear nanophotonics for which they enable special types of optical nonlinearity, such as electron-hole plasma photoexcitation, which are not inherent to plasmonic nanostructures. Here, we propose a novel geometry for highly tunable alldielectric nanoantennas, consisting of a chain of silicon nanoparticles excited by an electric dipole source, which allows tuning their radiation properties via electron-hole plasma photoexcitation. We show that the slowly guided modes determining the Van Hove singularity of the nanoantenna are very sensitive to the nanoparticle permittivity, opening up the ability to utilize this effect for efficient all-optical modulation. We show that by pumping several boundary nanoparticles with relatively low intensities may cause dramatic variations in the nanoantenna radiation power patterns and Purcell factor. We also demonstrate that ultrafast pumping of the designed nanoantenna allows unidirectional launching of surface plasmon-polaritons, with interesting implications for modern nonlinear nanophotonics.

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“…The coupled dipole approximation outlined above is justified for the geometrical parameters of the nanoparticles and their relative distance [34]. The solution of Eq.…”

Section: Resultsmentioning

confidence: 99%

All-Optical Switching and Unidirectional Plasmon Launching with Nonlinear Dielectric Nanoantennas

Krasnok

Lepeshov

et al. 2018

Phys. Rev. Applied

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“…The arrays of dielectric nanonparticles can serve as subwavelength waveguides to be emploied as the key components for future integrated optics [15][16][17][18][19]21]. They could be potentially advantageous against nanoplasmonics due to, for instance, the opportunity to control the frequencies of electric and magnetic Mie resonances by changing the geometry of high-index nanoparticles, and the absence of free carriers resulting in a high Q-factor.…”

Section: Light Guiding Above the Light Linementioning

confidence: 99%

“…Guiding of electromagnetic waves by a linear array of dielectric spheres below the diffraction limit attracted more attention. There were two types of consideration: finite arrays [12][13][14][15][16] and infinite arrays which were studied by means of the coupled-dipole approximation [17][18][19][20][21][22][23]. Only in 2013 a full-wave analysis of waves on linear arrays of dielectric spheres below the light cone was provided by Linton, Zalipaev, and Thompson [24].…”

Section: Introductionmentioning

confidence: 99%

Light Trapping above the Light Cone in One-Dimensional Arrays of Dielectric Spheres

2017

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Abstract:We demonstrate bound states in the radiation continuum (BSC) in a linear periodic array of dielectric spheres in air above the light cone. We classify the BSCs by orbital angular momentum m = 0, ±1, ±2 according to the rotational symmetry of the array, Bloch wave vector β directed along the array according to the translational symmetry, and polarization. The most simple symmetry protected BSCs have m = 0, β = 0 and occur in a wide range of the radius of the spheres and dielectric constant. More sophisticated BSCs with m = 0, β = 0 exist only for a selected radius of spheres at fixed dielectric constant. We also find robust Bloch BSCs with β = 0, m = 0. All BSCs reside within the first but below the other diffraction continua. We show that the BSCs can be easily detected by bright features in scattering of different plane waves by the array as dependent on type of the BSC. The symmetry protected TE/TM BSCs can be traced by collapsing Fano resonance in cross-sections of normally incident TE/TM plane waves. When plane wave with circular polarization with frequency tuned to the bound states with OAM illuminates the array the spin angular momentum of the incident wave transfers into the orbital angular momentum of the BSC. This, in turn, gives rise to giant vortical power currents rotating around the array. Incident wave with linear polarization with frequency tuned to the Bloch bound state in the continuum induces giant laminar power currents. At last, the plane wave with linear polarization incident under tilt relative to the axis of array excites Poynting currents spiralling around the array. It is demonstrated numerically that quasi-bound leaky modes of the array can propagate both stationary waves and light pulses to a distance of 60 wavelengths at the frequencies close to the bound states in the radiation continuum. A semi-analytical estimate for decay rates of the guided waves is found to match the numerical data to a good accuracy.

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“…There were two types of considerations: finite arrays [1,2,3,4] and infinite arrays which were studied by means of the coupled-dipole approximation [5,6,7,8,9,10]. A consummate analysis of electromagnetic waves propagating along linear arrays of dielectric spheres below the light cone was provided by Linton et al [11].…”

Section: Introductionmentioning

confidence: 99%

Trapping of light with angular orbital momentum above the light cone

Bulgakov¹,

Sadreev

2017

AEM

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We consider bound states in the radiation continuum (BSC) above the light cone in an one-dimensional periodic array of dielectric spheres in air. The BSCs are classified by orbital angular momentum m, Bloch wave vector β directed along the array, and polarization. The most simple symmetry protected BSCs have m = 0, β = 0 and occur in a wide range of the radius of spheres and dielectric constant. More sophisticated BSCs with m ̸ = 0, β = 0 exist only for a selected radius of the spheres at a fixed dielectric constant. We also show the existence of robust Bloch BSCs with β ̸ = 0, m = 0. The BSCs with m = 0 can be easily detected by the collapse of Fano resonance in scattering of a plane wave. In response to a plane wave with circular polarization the BSCs with m ̸ = 0 give rise to Poynting vector spiralling around the array.

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Subwavelength waveguides composed of dielectric nanoparticles

Cited by 90 publications

References 74 publications

All-Optical Switching and Unidirectional Plasmon Launching with Nonlinear Dielectric Nanoantennas

All-Optical Switching and Unidirectional Plasmon Launching with Nonlinear Dielectric Nanoantennas

Light Trapping above the Light Cone in One-Dimensional Arrays of Dielectric Spheres

Trapping of light with angular orbital momentum above the light cone

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