Articoli di riviste: "KERKER'S CONDITION"

1

Ali, Rfaqat. "Revisit of generalized Kerker’s conditions using composite metamaterials". Journal of Optics 22, n. 8 (24 luglio 2020): 085102. http://dx.doi.org/10.1088/2040-8986/ab9d14.

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Zambrana-Puyalto, X., I. Fernandez-Corbaton, M. L. Juan, X. Vidal e G. Molina-Terriza. "Duality symmetry and Kerker conditions". Optics Letters 38, n. 11 (22 maggio 2013): 1857. http://dx.doi.org/10.1364/ol.38.001857.

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García-Cámara, B., R. Alcaraz de la Osa, J. M. Saiz, F. González e F. Moreno. "Directionality in scattering by nanoparticles: Kerker’s null-scattering conditions revisited". Optics Letters 36, n. 5 (28 febbraio 2011): 728. http://dx.doi.org/10.1364/ol.36.000728.

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Dmitriev, A. A., e M. V. Rybin. "Dimer of dielectric nanospheres as a generalized Huygens element". Journal of Physics: Conference Series 2227, n. 1 (1 marzo 2022): 012016. http://dx.doi.org/10.1088/1742-6596/2227/1/012016.

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Abstract We study the conditions of suppressed backward scattering in optical oligomers. Optical oligomers are closely packed clusters of nanoparticles which support multiple resonances, allowing to achieve scattering phase rotation by 2π necessary for metalenses. In this paper we consider the simplest oligomer — a dimer, which is irradiated by a normally-incident plane wave with the magnetic field oriented along the dimer axis. Using the dipole approximation, we have derived analytically the generalized Kerker condition for this system. Similarly to a single sphere case, the electric and magnetic dipole have to be of the same amplitude to suppress the backward scattering. However, due to the inter-particle coupling, the full coupled-dipole problem must be solved to find the wavelength of the backscattering suppression. Using the coupled-dipole and coupled-multipole methods, we have found that the Kerker condition wavelength for the considered dimer is red-shifted compared to a single sphere.

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Alaee, R., R. Filter, D. Lehr, F. Lederer e C. Rockstuhl. "A generalized Kerker condition for highly directive nanoantennas". Optics Letters 40, n. 11 (1 giugno 2015): 2645. http://dx.doi.org/10.1364/ol.40.002645.

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Wei, Lei, Nandini Bhattacharya e H. Paul Urbach. "Adding a spin to Kerker’s condition: angular tuning of directional scattering with designed excitation". Optics Letters 42, n. 9 (26 aprile 2017): 1776. http://dx.doi.org/10.1364/ol.42.001776.

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7

Sun, Song, Dacheng Wang, Zheng Feng e Wei Tan. "Highly efficient unidirectional forward scattering induced by resonant interference in a metal–dielectric heterodimer". Nanoscale 12, n. 43 (2020): 22289–97. http://dx.doi.org/10.1039/d0nr07010f.

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Hesari-Shermeh, Maryam, Bijan Abbasi-Arand e Mohammad Yazdi. "Generalized Kerker’s conditions under normal and oblique incidence using the polarizability tensors of nanoparticles". Optics Express 29, n. 2 (4 gennaio 2021): 647. http://dx.doi.org/10.1364/oe.411110.

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Pors, Anders, Sebastian K. H. Andersen e Sergey I. Bozhevolnyi. "Unidirectional scattering by nanoparticles near substrates: generalized Kerker conditions". Optics Express 23, n. 22 (27 ottobre 2015): 28808. http://dx.doi.org/10.1364/oe.23.028808.

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Carretero, Luis, Pablo Acebal e Salvador Blaya. "Kerker’s conditions for chiral particles: Enhanced spin-to-orbital angular momentum conversion of the scattered light". Journal of Quantitative Spectroscopy and Radiative Transfer 222-223 (gennaio 2019): 60–64. http://dx.doi.org/10.1016/j.jqsrt.2018.10.023.

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11

Jang, Jaehyuck, Heonyeong Jeong, Guangwei Hu, Cheng-Wei Qiu, Ki Tae Nam e Junsuk Rho. "Tunable Metasurfaces: Kerker-Conditioned Dynamic Cryptographic Nanoprints (Advanced Optical Materials 4/2019)". Advanced Optical Materials 7, n. 4 (febbraio 2019): 1970016. http://dx.doi.org/10.1002/adom.201970016.

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12

Zhang, Yinan, Shiren Chen e Jing Han. "Broadband and Highly Directional Visible Light Scattering by Laser-Splashed Lossless TiO2 Nanoparticles". Molecules 26, n. 20 (10 ottobre 2021): 6106. http://dx.doi.org/10.3390/molecules26206106.

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Abstract (sommario):

All-dielectric nanoparticles, as the counterpart of metallic nanostructures have recently attracted significant interest in manipulating light-matter interaction at a nanoscale. Directional scattering, as an important property of nanoparticles, has been investigated in traditional high refractive index materials, such as silicon, germanium and gallium arsenide in a narrow band range. Here in this paper, we demonstrate that a broadband forward scattering across the entire visible range can be achieved by the low loss TiO2 nanoparticles with moderate refractive index. This mainly stems from the optical interferences between the broadband electric dipole and the magnetic dipole modes. The forward/backward scattering ratio reaches maximum value at the wavelengths satisfying the first Kerker’s condition. Experimentally, the femtosecond pulsed laser was employed to splash different-sized nanoparticles from a thin TiO2 film deposited on the glass substrate. Single particle scattering measurement in both the forward and backward direction was performed by a homemade confocal microscopic system, demonstrating the broadband forward scattering feature. Our research holds great promise for many applications such as light harvesting, photodetection and on-chip photonic devices and so on.

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Babicheva, Viktoriia E. "Lattice Kerker effect in the array of hexagonal boron nitride antennas". MRS Advances 3, n. 45-46 (2018): 2783–88. http://dx.doi.org/10.1557/adv.2018.510.

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ABSTRACTSubwavelength particles with hyperbolic light dispersion in the constituent medium are a promising alternative to plasmonic, high-refractive-index dielectric, and semiconductor structures in the practical realization of nanoscale optical elements. Hexagonal boron nitride (hBN) is a layered van der Waals material with natural hyperbolic properties and low-loss phonon-polaritons at the same time. In this work, we consider multipole excitations and antennas properties of hBN particles with an emphasis on the periodic arrangement and collective array modes. We analyze excitation of lattice resonances in the antenna array and effect of resonance shifts and overlap with other multipoles supported by particles in the lattice. In such periodic structure, a decrease of reflectance from the array is achieved with appropriate lattice spacing (periods) where the electric and magnetic multipoles overlap, and the resonance oscillations are in phase and comparable in magnitude. We theoretical demonstrate that in this case, generalized Kerker condition is satisfied, and hBN antennas in the array efficiently scatter light in the predominantly forward direction resulting in near-zero reflectance. The resonant lattice Kerker effect with hyperbolic-medium antennas can be applied in developing metasurfaces based on hBN resonators for mid-infrared photonics.

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Vergaz Benito, Ricardo, Braulio García-Cámara, José Francisco Algorri, Alexander Cuadrado e José Manuel Sánchez-Pena. "Exploring the scattering directionality and light interaction in nanoparticle dimers of different semiconductors". Photonics Letters of Poland 9, n. 2 (1 luglio 2017): 42. http://dx.doi.org/10.4302/plp.v9i2.707.

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Assuming as a starting point our recent work on a dimer of silicon nanoparticles with light scattering directionality, we have explored the light interaction between the incoming and scattered electric fields in dimers made of other different semiconductors. The scattering directionality is achieved by accomplishing Kerker's conditions. By directing the scattered light towards the gap of the dimer, interferential effects can be used to achieve high or low light intensities as a basis of all-optical nanoswitches. A comparison between dimers of different materials is shown. Full Text: PDF ReferencesR. Gómez-Medina, B. García-Cámara, I. Súarez-Lacalle, F. González, F. Moreno, M. Nieto-Vesperias and J.J. Sáenz, "Electric and magnetic dipolar response of germanium nanospheres: interference effects, scattering anisotropy, and optical forces", J. Nanophoton. 5 053512 (2011). CrossRef B. Rolly, B. Stout and N. Bonod, "Boosting the directivity of optical antennas with magnetic and electric dipolar resonant particles", Opt. Express 20 20376 (2012). CrossRef B. García-Cámara, R. Gómez-Medina, J.J. Sáenz, and B. Sepúlveda, "Sensing with magnetic dipolar resonances in semiconductor nanospheres", Opt. Express 21 23007-23020 (2013). CrossRef B. García-Cámara et al., "All-Optical Nanometric Switch Based on the Directional Scattering of Semiconductor Nanoparticles", J. Phys. Chem. C. 119, 19558?19564 (2015). CrossRef A.I. Barreda, H. Saleh, A. Litman, F. González, J-M. Geffrin, and F. Moreno, "Electromagnetic polarization-controlled perfect switching effect with high-refractive-index dimers and the beam-splitter configuration", Nat. Commun. 8, 13910 (2017). CrossRef R. Vergaz et al., "Control of the Light Interaction in a Semiconductor Nanoparticle Dimer Through Scattering Directionality", IEE Phot. Jour., 8(3), 4501410 (2016) CrossRef B. García-Cámara et al., "Size Dependence of the Directional Scattering Conditions on Semiconductor Nanoparticles", IEEE Photon. Technol. Lett. 27(19), 2059?2062 (2015). CrossRef

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15

Auñón, Juan Miguel, e Manuel Nieto-Vesperinas. "Optical forces from evanescent Bessel beams, multiple reflections, and Kerker conditions in magnetodielectric spheres and cylinders". Journal of the Optical Society of America A 31, n. 9 (14 agosto 2014): 1984. http://dx.doi.org/10.1364/josaa.31.001984.

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16

Liu, Wenbing, Lirong Huang, Jifei Ding, Chenkai Xie, Yi Luo e Wei Hong. "High-Performance Asymmetric Optical Transmission Based on a Dielectric–Metal Metasurface". Nanomaterials 11, n. 9 (16 settembre 2021): 2410. http://dx.doi.org/10.3390/nano11092410.

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Asymmetric optical transmission plays a key role in many optical systems. In this work, we propose and numerically demonstrate a dielectric–metal metasurface that can achieve high-performance asymmetric transmission for linearly polarized light in the near-infrared region. Most notably, it supports a forward transmittance peak (with a transmittance of 0.70) and a backward transmittance dip (with a transmittance of 0.07) at the same wavelength of 922 nm, which significantly enhances operation bandwidth and the contrast ratio between forward and backward transmittances. Mechanism analyses reveal that the forward transmittance peak is caused by the unidirectional excitation of surface plasmon polaritons and the first Kerker condition, whereas the backward transmittance dip is due to reflection from the metal film and a strong toroidal dipole response. Our work provides an alternative and simple way to obtain high-performance asymmetric transmission devices.

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Khokhar, Megha, Faraz A. Inam e Rajesh V. Nair. "Kerker Condition for Enhancing Emission Rate and Directivity of Single Emitter Coupled to Dielectric Metasurfaces (Advanced Optical Materials 17/2022)". Advanced Optical Materials 10, n. 17 (settembre 2022): 2270068. http://dx.doi.org/10.1002/adom.202270068.

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18

Wang, Xinghua, Yunbao Zheng, Min Ouyang, Haihua Fan, Qiaofeng Dai e Haiying Liu. "Dual-Wavelength Forward-Enhanced Directional Scattering and Second Harmonic Enhancement in Open-Hole Silicon Nanoblock". Nanomaterials 12, n. 23 (30 novembre 2022): 4259. http://dx.doi.org/10.3390/nano12234259.

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Nanostructures with appropriate sizes can limit light-matter interaction and support electromagnetic multipole resonance. The interaction between light and nanostructures is intimately related to manipulating the direction of scattered light in the far field as well as the electromagnetic field in the near field. In this paper, we demonstrate dual-wavelength directional forward-scattering enhancement in an individual open-hole silicon nanoblock (OH-SiNB) and simultaneously achieve bulk and surface electromagnetic field localization. The second harmonic generation is enhanced using electromagnetic field localization on the square hole surface. Numerical simulations reveal that the resonance modes, at λ1 = 800 nm and λ2 = 1190 nm, approximately satisfy the Kerker condition. In the near field, the magnetic dipole modes at dual wavelength all satisfy the boundary condition that the normal component of the electric displacement is continuous on the square holes surface, thus obtaining the surface electromagnetic field localization. Moreover, highly efficient second harmonic generation can be achieved at dual wavelengths using the surface electromagnetic field localization and the increased surface area of the square holes. Our results provide a new strategy for the integration of nanoantennas and nonlinear optoelectronic devices in optical chips.

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Ward, Jonathan, Khosro Zangeneh Kamali, Lei Xu, Guoquan Zhang, Andrey E. Miroshnichenko e Mohsen Rahmani. "High-contrast and reversible scattering switching via hybrid metal-dielectric metasurfaces". Beilstein Journal of Nanotechnology 9 (6 febbraio 2018): 460–67. http://dx.doi.org/10.3762/bjnano.9.44.

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Novel types of optical hybrid metasurfaces consist of metallic and dielectric elements are designed and proposed for controlling the interference between magnetic and electric modes of the system, in a reversible manner. By employing the thermo-optical effect of silicon and gold nanoantennas we demonstrate an active control on the excitation and interference between electric and magnetic modes, and subsequently, the Kerker condition, as a directive radiation pattern with zero backscattering, via temperature control as a versatile tool. This control allows precise tuning optical properties of the system and stimulating switchable sharp spectral Fano-like resonance. Furthermore, it is shown that by adjusting the intermediate distance between metallic and dielectric elements, opposite scattering directionalities are achievable in an arbitrary wavelength. Interestingly, this effect is shown to have a direct influence on nonlinear properties, too, where 10-fold enhancement in the intensity of third harmonic light can be obtained for this system, via heating. This hybrid metasurface can find a wide range of applications in slow light, nonlinear optics and bio-chemical sensing.

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20

Babicheva, V. E. "Directional scattering by the hyperbolic-medium antennas and silicon particles". MRS Advances 3, n. 33 (2018): 1913–17. http://dx.doi.org/10.1557/adv.2018.112.

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ABSTRACTOptical antennas made out of materials with hyperbolic dispersion is an alternative approach to realizing efficient subwavelength scatterers and may overcome limitations imposed by plasmonic and all-dielectric designs. Recently emerged natural hyperbolic material hexagonal boron nitride supports phonon-polariton excitations with low optical losses and high anisotropy. Here we study scattering properties of the hyperbolic-medium (HM) antennas, and in particular, we consider a combination of two types of the particles - HM bars and silicon spheres - arranged in a periodic array. We analyze excitation of electric and magnetic resonances in the particles and effect of their overlap in the array. We theoretically demonstrate that decrease of reflectance from the array can be achieved with appropriate particle dimensions where electric and magnetic resonances of different particle types overlap, and the resonance oscillations are in phase. In this case, generalized Kerker condition is satisfied, and particle dimers in the array efficiently scatter light in the forward direction. The effect can be used in designing metasurfaces based on hexagonal boron nitride scatterers with an application in mid-infrared photonics.

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Khokhar, Megha, Nitesh Singh e Rajesh V. Nair. "Stacked metasurfaces for enhancing the emission and extraction rate of single nitrogen-vacancy centers in nanodiamond". Journal of Optics 24, n. 2 (12 gennaio 2022): 024008. http://dx.doi.org/10.1088/2040-8986/ac3f95.

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Abstract Dielectric metasurfaces with unique possibilities of manipulating light–matter interaction lead to new insights in exploring spontaneous emission control using single quantum emitters. Here, we study the stacked metasurfaces in one- (1D) and two-dimensions (2D) to enhance the emission rate of a single quantum emitter using the associated optical resonances. The 1D structures with stacked bilayers are investigated to exhibit Tamm plasmon resonance optimized at the zero phonon line (ZPL) of the negative nitrogen-vacancy (NV−) center. The 2D stacked metasurface comprising of two-slots silicon nano-disks is studied for the Kerker condition at ZPL wavelength. The far-field radiation plots for the 1D and 2D stacked metasurfaces show an increased extraction efficiency rate for the NV− center at ZPL wavelength that reciprocates the localized electric field intensity. The modified local density of optical states results in large Purcell enhancement of 3.8 times and 25 times for the single NV− center integrated with 1D and 2D stacked metasurface, respectively. These results have implications in exploring stacked metasurfaces for applications such as single photon generation and CMOS compatible light sources for on-demand chip integration.

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Bosomtwi, Dominic, e Viktoriia E. Babicheva. "Beyond Conventional Sensing: Hybrid Plasmonic Metasurfaces and Bound States in the Continuum". Nanomaterials 13, n. 7 (3 aprile 2023): 1261. http://dx.doi.org/10.3390/nano13071261.

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Fano resonances result from the strong coupling and interference between a broad background state and a narrow, almost discrete state, leading to the emergence of asymmetric scattering spectral profiles. Under certain conditions, Fano resonances can experience a collapse of their width due to the destructive interference of strongly coupled modes, resulting in the formation of bound states in the continuum (BIC). In such cases, the modes are simultaneously localized in the nanostructure and coexist with radiating waves, leading to an increase in the quality factor, which is virtually unlimited. In this work, we report on the design of a layered hybrid plasmonic-dielectric metasurface that facilitates strong mode coupling and the formation of BIC, resulting in resonances with a high quality factor. We demonstrate the possibility of controlling Fano resonances and tuning Rabi splitting using the nanoantenna dimensions. We also experimentally demonstrate the generalized Kerker effect in a binary arrangement of silicon nanodisks, which allows for the tuning of the collective modes and creates new photonic functionalities and improved sensing capabilities. Our findings have promising implications for developing plasmonic sensors that leverage strong light-matter interactions in hybrid metasurfaces.

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Huang, Dengchao, Shilin Liu e Kang Yang. "Highly Unidirectional Radiation Enhancement Based on a Hybrid Multilayer Dimer". Nanomaterials 12, n. 4 (21 febbraio 2022): 710. http://dx.doi.org/10.3390/nano12040710.

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Dimers made of plasmonic particles support strong field enhancements but suffer from large absorption losses, while low-loss dielectric dimers are limited by relatively weak optical confinement. Hybrid dimers could utilize the advantages of both worlds. Here, we propose a hybrid nanoantenna that contains a dimer of core-dual shell nanoparticles known as the metal–dielectric–metal (MDM) structure. We discovered that the hybrid dimer sustained unidirectional forward scattering, which resulted in a nearly ideal Kerker condition in the frequency close to the resonance peak of the dimer due to enhancing the amplitude of the induced high-order electric multiples in the gap and effectively superimposing them with magnetic ones, which respond to the excitation of the plane wave in the dielectric layer of the dimer. Furthermore, when an electric quantum emitter is coupled to the dimer, our study shows that the optimal hybrid dimer simultaneously possesses high radiation directivity and low-loss features, which illustrates a back-to-front ratio of radiation 53 times higher than that of the pure dielectric dimer and an average radiation efficiency 80% higher than that of the pure metallic dimer. In addition, the unique structures of the hybrid hexamer direct almost decrease 75% of the radiation beamwidth, hence heightening the directivity of the nanoantenna based on a hybrid dimer.

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Shen, Fei, Ning An, Yifei Tao, Hongping Zhou, Zhaoneng Jiang e Zhongyi Guo. "Anomalous forward scattering of gain-assisted dielectric shell-coated metallic core spherical particles". Nanophotonics 6, n. 5 (9 dicembre 2016): 1063–72. http://dx.doi.org/10.1515/nanoph-2016-0141.

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AbstractWe have investigated the scattering properties of an individual core-shell nanoparticle using the Mie theory, which can be tuned to support both electric and magnetic modes simultaneously. In general, the suppression of forward scattering can be realized by the second Kerker condition. Here, a novel mechanism has to be adopted to explain zero-forward scattering, which originates from the complex interactions between dipolar and quadrupolar modes. However, for lossy and lossless core-shell spherical nanoparticles, zero-forward scattering can never be achieved because the real parts of Mie expansion coefficients are always positive. By adding proper gain in dielectric shell, zero-forward scattering can be found at certain incident wavelengths, which means that all electric and magnetic responses in Mie scattering can be counteracted totally in the forward direction. In addition, if the absolute values of dipolar and quadrupolar terms are in the same order of magnitude, the local scattering minimum and maximum can be produced away from the forward and backward directions due to the interacting effect between the dipolar and quadrupolar terms. Furthermore, by adding suitable gain in shell, super-forward scattering can also be realized at certain incident wavelengths. We also demonstrated that anomalously weak scattering or superscattering could be obtained for the core-shell nanoparticles with suitable gain in shell. In particular, for such a choice of suitable gain in shell, we can obtain zero-forward scattering and anomalously weak scattering at the same wavelength as well as super-forward scattering at another wavelength. These features may provide new opportunities for cloaking, plasmonic lasers, optical antennas, and so on.

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Lee, Jeng Yi, Andrey E. Miroshnichenko e Ray-Kuang Lee. "Reexamination of Kerker's conditions by means of the phase diagram". Physical Review A 96, n. 4 (18 ottobre 2017). http://dx.doi.org/10.1103/physreva.96.043846.

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Inam, Faraz A., e Rajesh V. Nair. "A Coupled‐Dipolar Plasmonic Antenna for Enhanced and Directional Emission from a Single NV Center at the Generalized Kerker Condition". Advanced Quantum Technologies, 25 agosto 2023. http://dx.doi.org/10.1002/qute.202300088.

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AbstractPlasmonic antennas are widely used to achieve substantial emission rate enhancement. These antennas suffer from significant absorption losses that preclude the observation of Kerker conditions in such systems. The perfect balancing of the Mie‐scattering moments in an antenna at the generalized Kerker condition provides radiation directionality to its far‐field scattering pattern and zero absorption losses, a situation not achievable for a plasmonic system. Here, using both theoretical and computational approaches, the superposition of Mie‐scattering moments induced by coupling two individual silver (Ag) cylinders in a coupled‐dipolar plasmonic antenna is discussed. This results in the balancing of multipolar moments to a large extent with unidirectional scattering and hence the generalized Kerker condition in a plasmonic system. By placing a nanodiamond‐based single NV‐ center in the plasmonic gap‐cavity formed between the two Ag cylinders, >300 times Purcell enhancement is achieved with improved emission directionality leading to 80% collection efficiency. The proposed coupled‐dipolar plasmonic antenna is well suited for generating bright single photon emissions with a GHz emission rate, which is helpful for quantum photonic applications.

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Jang, Jaehyuck, Heonyeong Jeong, Guangwei Hu, Cheng‐Wei Qiu, Ki Tae Nam e Junsuk Rho. "Kerker‐Conditioned Dynamic Cryptographic Nanoprints". Advanced Optical Materials, 17 dicembre 2018, 1801070. http://dx.doi.org/10.1002/adom.201801070.

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Olmos-Trigo, Jorge, Cristina Sanz-Fernández, Diego R. Abujetas, Jon Lasa-Alonso, Nuno de Sousa, Aitzol García-Etxarri, José A. Sánchez-Gil, Gabriel Molina-Terriza e Juan José Sáenz. "Kerker Conditions upon Lossless, Absorption, and Optical Gain Regimes". Physical Review Letters 125, n. 7 (13 agosto 2020). http://dx.doi.org/10.1103/physrevlett.125.073205.

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Liu, Ai‐Yin, Jou‐Chun Hsieh, Kuang‐I Lin, Snow H. Tseng e Hui‐Hsin Hsiao. "Third Harmonic Generation Enhanced by Generalized Kerker Condition in All‐Dielectric Metasurfaces". Advanced Optical Materials, 27 giugno 2023. http://dx.doi.org/10.1002/adom.202300526.

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Coe, Brighton, Jorge Olmos‐Trigo, Dylan Qualls, Minani Alexis, Michal Szczerba, Diego R. Abujetas, Mahua Biswas e Uttam Manna. "Unraveling Dipolar Regime and Kerker Conditions in Mid‐Index Mesoscale Dielectric Materials". Advanced Optical Materials, 9 dicembre 2022, 2202140. http://dx.doi.org/10.1002/adom.202202140.

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Bukharin, Mikhail M., Vladimir Ya Pecherkin, Anar K. Ospanova, Vladimir B. Il’in, Leonid M. Vasilyak, Alexey A. Basharin e Boris Luk‘yanchuk. "Transverse Kerker effect in all-dielectric spheroidal particles". Scientific Reports 12, n. 1 (14 maggio 2022). http://dx.doi.org/10.1038/s41598-022-11733-4.

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AbstractKerker effect is one of the unique phenomena in modern electrodynamics. Due to overlapping of electric and magnetic dipole moments, all-dielectric particles can be invisible in forward or backward directions. In our paper we propose new conditions between resonantly excited electric dipole and magnetic quadrupole in ceramic high index spheroidal particles for demonstrating transverse Kerker effect. Moreover, we perform proof-of-concept microwave experiment and demonstrate dumbbell radiation pattern with suppressed scattering in both forward and backward directions and enhanced scattering in lateral directions. Our concept is promising for future planar lasers, nonreflected metasurface and laterally excited waveguides and nanoantennas.

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Marqués, Manuel I., Shulamit Edelstein e Pedro A. Serena. "A proposal to measure Belinfante’s curl of the spin optical force based on the Kerker conditions". European Physical Journal Plus 136, n. 2 (febbraio 2021). http://dx.doi.org/10.1140/epjp/s13360-021-01138-z.

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AbstractThe linear momentum of electromagnetic radiation is proportional to the Poynting vector. However, when light interacts with a dipole, the radiation pressure generated is no longer proportional to the Poynting vector: the so-called Belinfante’s momentum or equivalently, the curl of the spin density of the light field, must be considered. In this paper, we propose an optical configuration, based on two evanescent counter-propagating waves, perpendicularly polarized, capable of detecting Belinfante’s mechanical action. The two beams interact with a high-refractive-index particle like silicon. The direction of the radiation pressure exerted on the particle, proportional only to the curl of the spin density, depends on the electric and magnetic response of the particle and changes sign at the radiation wavelengths corresponding with the Kerker conditions.

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Kuznetsov, Alexey V., Adrià Canós Valero, Hadi K. Shamkhi, Pavel Terekhov, Xingjie Ni, Vjaceslavs Bobrovs, Mikhail V. Rybin e Alexander S. Shalin. "Special scattering regimes for conical all-dielectric nanoparticles". Scientific Reports 12, n. 1 (19 dicembre 2022). http://dx.doi.org/10.1038/s41598-022-25542-2.

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AbstractAll-dielectric nanophotonics opens a venue for a variety of novel phenomena and scattering regimes driven by unique optical effects in semiconductor and dielectric nanoresonators. Their peculiar optical signatures enabled by simultaneous electric and magnetic responses in the visible range pave a way for a plenty of new applications in nano-optics, biology, sensing, etc. In this work, we investigate fabrication-friendly truncated cone resonators and achieve several important scattering regimes due to the inherent property of cones—broken symmetry along the main axis without involving complex geometries or structured beams. We show this symmetry breaking to deliver various kinds of Kerker effects (generalized and transverse Kerker effects), non-scattering hybrid anapole regime (simultaneous anapole conditions for all the multipoles in a particle leading to the nearly full scattering suppression) and, vice versa, superscattering regime. Being governed by the same straightforward geometrical paradigm, discussed effects could greatly simplify the manufacturing process of photonic devices with different functionalities. Moreover, the additional degrees of freedom driven by the conicity open new horizons to tailor light-matter interactions at the nanoscale.

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Khokhar, Megha, Faraz A. Inam e Rajesh V. Nair. "Kerker Condition for Enhancing Emission Rate and Directivity of Single Emitter Coupled to Dielectric Metasurfaces". Advanced Optical Materials, 6 luglio 2022, 2200978. http://dx.doi.org/10.1002/adom.202200978.

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Nieto-Vesperinas, Manuel, e Xiaohao Xu. "Reactive helicity and reactive power in nanoscale optics: Evanescent waves. Kerker conditions. Optical theorems and reactive dichroism". Physical Review Research 3, n. 4 (28 ottobre 2021). http://dx.doi.org/10.1103/physrevresearch.3.043080.

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Li, Shuang, Li-rong Huang, Yong-hong Ling, Wen-bing Liu, Chun-fa Ba e Han-hui Li. "High-performance asymmetric optical transmission based on coupled complementary subwavelength gratings". Scientific Reports 9, n. 1 (19 novembre 2019). http://dx.doi.org/10.1038/s41598-019-53586-4.

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AbstractAsymmetric transmission (AT) devices are fundamental elements for optical computing and information processing. We here propose an AT device consisting of a pair of coupled complementary subwavelength gratings. Different from previous works, asymmetric dielectric environment is employed for unidirectional excitation of surface plasmon polaritons (SPPs) and thus asymmetric optical transmission, and near-field coupling effect inherent in the coupled complementary structure is exploited to enhance forward transmission and AT behavior, and determine operation bandwidth as well. The influence of asymmetric dielectric environment, effect of vertical and lateral couplings, interactions of electric- and magnetic-dipole moments and the realization of Kerker conditions, are investigated in depth to unearth the AT mechanism and performance. High-performance AT with large forward transmittance of 0.96 and broad bandwidth of 174 nm is achieved at wavelength 1250 nm. Our work helps people to gain a better understanding of near-filed coupling effect in coupled complementary structures, expand their application fields, and it also offers an alternate way to high-performance AT devices.

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Sadafi, Mohammad Mojtaba, Achiles Fontana da Mota e Hossein Mosallaei. "Dynamic control of light scattering in a single particle enabled by time modulation". Applied Physics Letters 123, n. 10 (4 settembre 2023). http://dx.doi.org/10.1063/5.0145291.

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The interaction of light with time-varying materials offers intriguing opportunities for controlling light scattering and wavefront manipulation, thereby unlocking fascinating applications in the realm of optics and photonics. In this study, we present an analytical solution for the scattering from a particle made of a material with time-varying permittivity by exploiting the T-matrix approach. Through the manipulation of the active medium's eigenvalues, we demonstrate the pivotal ability to regulate the elements of a dynamically controlled T-matrix, thus enabling precise control over the scattering characteristics of the particle. Crucially, this dynamic control is achieved without resorting to modifying the particle's inherent physical parameters, such as shape, size, and dispersion. We demonstrate that the eigenvalues of the dynamic material can be skillfully manipulated through the adequate choice of the particle's modulation function, resulting in either in-phase or out-of-phase interactions between the magnetic and electric dipole modes, allowing us to satisfy the Kerker conditions at diverse harmonics. The results of the optimal modulation functions are presented in both the near-field and far-field regions, revealing time modulation as a dynamic means of achieving unidirectional scattering. Our findings pave the way for developing time-varying structures comprising dynamic meta-atoms, offering valuable insight into advanced light–matter interactions, and providing lucrative guidance for future research in the realm of dynamic photonic systems.

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