All-dielectric reciprocal bianisotropic nanoparticles

Alaee, Rasoul; Albooyeh, Mohammad; Rahimzadegan, Aso; Mirmoosa, M. S.; Kivshar, Yuri S.; Rockstuhl, Carsten

doi:10.1103/physrevb.92.245130

Cited by 101 publications

(72 citation statements)

References 52 publications

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“…It should be noted that similar structures have been employed to study the magnetoelectric coupling effect induced by geometric symmetry breaking. 38 Here, we show that such a simple system continues to harvest functionality for nanophotonics. In order to investigate the electromagnetic modes supported by the SNC, we conduct the full-wave simulations for plane wave excitation.…”

Section: Resultsmentioning

confidence: 80%

Isotropic Magnetic Purcell Effect

et al. 2017

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Manipulating the spontaneous emission rate of optical emitters with all-dielectric nanoparticles benefits from their low-loss nature and thus provides relatively large extrinsic quantum yield. However, such Purcell effect greatly depends on the orientation of the dipole emitter. Here, we introduce the concept of isotropic magnetic Purcell effect with Purcell factors about 300 and large extrinsic quantum yield (more than 80%) for a magnetic dipole emitter of arbitrary orientation in an asymmetric silicon nanocavity.The extrinsic quantum yield can be even boosted up to nearly 100% by utilizing a GaP nanocavity. Isotropy of the Purcell factor is manifested via the orientation-independent emission of the magnetic dipole source. This isotropic Purcell effect is robust against small displacement of emitter on the order of 10 nm, releasing the requirement of precise alignment in experiments. arXiv:1810.07350v1 [physics.optics]

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Section: Resultsmentioning

confidence: 80%

Isotropic Magnetic Purcell Effect

et al. 2017

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“…3). The asymmetric forces can be understood from the fact that the system is not invariant under space inversion [38,39]. We use the wellknown PT phase-transition parameters, i.e., n 0 d=λ and n 00 =n 0 [35,[40][41][42], to conduct a detailed study concerning their influence on the optical forces, transmission, and eigenvalues of the scattering matrix:…”

Section: Theorymentioning

confidence: 99%

Optical Pulling and Pushing Forces in Bilayer PT -Symmetric Structures

2018

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We investigate the optical force exerted on a parity-time-symmetric bilayer made of balanced gain and loss. We show that an asymmetric optical pulling or pushing force can be exerted on this system depending on the direction of impinging light. The optical pulling or pushing force has a direct physical link to the optical characteristics embedded in the non-Hermitian bilayer. Furthermore, we suggest taking advantage of the optically generated asymmetric force to launch vibrations of an arbitrary shape, which is useful for the contactless probing of mechanical deformations.

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“…Most of the microscopic design schemes rely on full-wave numerical simulations to associate a given subwavelength structure with its equivalent meta-atom constituents, yielding a lookup table that is utilized for general metasurface realization. However, whether in microwave or optical frequencies, bianisotropic metasurfaces, typically necessary for complex beam manipulation, require simultaneous tuning * epsteina@ee.technion.ac.il of multiple degrees of freedom at the meta-atom level [4,12,14,15,[35][36][37][38][39]; relying on full-wave optimization to engineer each and every meta-atom quickly becomes unreasonable, especially for generally-inhomogeneous metasurfaces (e.g., [7,9,25]).…”

Section: Introductionmentioning

confidence: 99%

Unveiling the Properties of Metagratings via a Detailed Analytical Model for Synthesis and Analysis

2017

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We present detailed analytical modelling and in-depth investigation of wide-angle reflect-mode metagrating beam splitters. These recently introduced ultrathin devices are capable of implementing intricate diffraction engineering functionalities with only a single meta-atom per macro-period, making them considerably simpler to synthesize than conventional metasurfaces. We extend upon recent work and focus on electrically-polarizable metagratings, comprised of loaded conducting wires in front of a perfect elecric conductor, excited by transverse-electric polarized fields, which are more practical for planar fabrication. The derivation further relates the metagrating performance parameters to the individual meta-atom load, facilitating an efficient semianalytical synthesis scheme to determine the required conductor geometry for achieving optimal beam splitting. Subsequently, we utilize the model to analyze the effects of realistic conductor losses, reactance deviations, and frequency shifts on the device performance, and reveal that metagratings feature preferable working points, in which the sensitivity to these non-idealities is rather low. The analytical relations shed light on the physical origin of this phenomenon, associating it with fundamental interference processes taking place in the device. These results, verified via full-wave simulations of realistic physical structures, yield a set of efficient engineering tools, as well as profound physical intuition, for devising future metagrating devices, with immense potential for microwave, terahertz, and optical beam-manipulation applications.

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All-dielectric reciprocal bianisotropic nanoparticles

Cited by 101 publications

References 52 publications

Isotropic Magnetic Purcell Effect

Isotropic Magnetic Purcell Effect

Optical Pulling and Pushing Forces in Bilayer PT -Symmetric Structures

Unveiling the Properties of Metagratings via a Detailed Analytical Model for Synthesis and Analysis

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