• Photonics Research
  • Vol. 12, Issue 4, 608 (2024)
Hooman Barati Sedeh and Natalia M. Litchinitser*
Author Affiliations
  • Department of Electrical and Computer Engineering, Duke University, Durham, North Carolina 27708, USA
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    DOI: 10.1364/PRJ.503182 Cite this Article Set citation alerts
    Hooman Barati Sedeh, Natalia M. Litchinitser. From non-scattering to super-scattering with Mie-tronics[J]. Photonics Research, 2024, 12(4): 608 Copy Citation Text show less

    Abstract

    Electric anapoles, arising from the destructive interference of primitive and toroidal electric dipole moments, have recently emerged as a fundamental class of non-scattering sources. On the other hand, super-scattering states represent the opposite regime wherein the scattering cross-section of a subwavelength particle exceeds the single-channel limit, leading to a strong scattering behavior. Here, we demonstrate that the interplay between the topology of light and the subwavelength scatterer can lead to these two opposite responses within an isolated all-dielectric meta-atom. In particular, we present the emergence of a new non-scattering state, referred to as hybrid anapole, which surpasses conventional electric dipole anapoles by achieving a remarkable 23-fold enhancement in the suppression of far-field radiation and almost threefold enhancement in the confinement of electromagnetic energy inside the meta-atom. We also explore the role of particle orientation and its inversion symmetry in the scattering response and predict the possibility of switching between non-scattering and super-scattering states within the same platform. The presented study elucidates the role of light and matter topologies in the scattering response of subwavelength meta-atoms, uncovering two opposite regimes of light-matter interaction and opening new avenues in applications such as nonlinear optics and spectroscopy.
    σsct(ω)=k04ϵd12πϵ02μ0c|p+ik0ϵdcT1(e)+ik03ϵd2cT2(e)|2+k04(ϵd)3/212πϵ0c|m+ik0ϵdcT(m)|2+k06(ϵd)3/2160πϵ02μ0cu,v|Q^u,v(e)+ik0ϵdcT^u,v(Qe)|2+k06(ϵd)5/2160πϵ0cu,v|Q^u,v(m)+ik0ϵdcT^u,v(Qm)|2,

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    pu(ω)=iωVpJin,u(r;ω)dr,mu(ω)=12Vp(r×Jin(r;ω))udr,Q^u,v(e)(ω)=iωVpruJin,v(r;ω)+rvJin,u(r;ω)23δuv(r·Jin(r;ω))dr,Q^u,v(m)(ω)=13Vp((r×Jin(r;ω))urv+(r×Jin(r;ω))vru)dr,

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    T1,u(e)(ω)=110Vp(r·Jin(r;ω))ru2|r|2Jin,u(r;ω)dr,T2,u(e)(ω)=1280Vp3|r|4Jin,u(r;ω)2|r|2(r·Jin(r;ω))rudr,Tu(m)(ω)=iω20Vp|r|2(r×Jin(r;ω))udr,T^uv(Qe)(ω)=142Vp(4(r·Jin(r;ω))rurv+2(r·Jin(r;ω))|r|2δuv5(ruJin,v(r;ω)+rvJin,u(r;ω))|r|2)dr,T^uv(Qm)(ω)=iω42Vp|r|2((r×Jin(r;ω))urv+(r×Jin(r;ω))vru)dr.

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    EDA:  p(ω)+ik0ϵdcT1(e)(ω)=0,MDA:  m(ω)+ik0ϵdcT(m)(ω)=0,EQA:  Q^(e)(ω)+ik0ϵdcT^(Qe)(ω)=0,MQA:  Q^(m)(ω)+ik0ϵdcT^(Qm)(ω)=0.

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    ESct(n,ω)=k02exp(ik0r)4πϵ0r((n×((p(ω)+ik0ϵdcT1(e)(ω)+ik03ϵd2cT2(e)(ω))×n))+1c((m(ω)+ik0ϵdcT(m)(ω))×n)+ik02c(n×(n×((Q^(m)(ω)+ik0ϵdcT^(Qm)(ω))·n)))+ik02cn((Q^(m)(ω)+ik0ϵdcT^(Qm)(ω))·n))),(A1)

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    Hooman Barati Sedeh, Natalia M. Litchinitser. From non-scattering to super-scattering with Mie-tronics[J]. Photonics Research, 2024, 12(4): 608
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