Anapole Manipulation in Tailored Si Nanocubes for Near-Field Enhancement and High <i>Q</i>-Factor Resonance

Sun, Shikun; He, Mengyue; Mao, Yu; Li, Ran; Tian, Shuo; Wang, Junqiao

doi:10.1021/acsanm.2c03133

Cited by 12 publications

(7 citation statements)

References 57 publications

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“…To perform a comprehensive analysis of the resonant modes induced in the designed nanostructure, the Cartesian multipole decomposition method is employed to calculate the contributions of various multipole modes to the absorption spectrum [27]. The calculation of various multipole moments, encompassing electric dipole (P), toroidal dipole (T), magnetic dipole (M), electric quadrupole (QE), and magnetic quadrupole (QM) moments, can be achieved by employing the subsequent equations,…”

Section: Modeling and Methodsmentioning

confidence: 99%

Ultra-narrow dual-band perfect absorber based on double-slotted silicon nanodisk arrays

Yang,

Luo,

et al. 2024

J. Phys. D: Appl. Phys.

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Due to its unique advantage of optical properties, nanophotonic metamaterials have gained extensive applications in perfect absorbers. However, achieving both dual-band and ultra-narrow linewidth in absorbers simultaneously remains a challenge for typical metal-dielectric based metamaterials. In this work, a dual-band ultra-narrow perfect absorber consisting of a double slotted silicon nano-disk array that located on a silver film with a silica spacer layer is proposed theoretically. By combining the hybrid mode excited by the coupling of diffraction wave mode and magnetic dipole mode with the anapole-anapole interaction, two absorption peaks can be induced in the near-infrared regime, achieving nearly perfect absorbance of 99.31% and 99.61%, with sub-nanometer linewidths of 1.92 nm and 1.25 nm respectively. In addition, the dual-band absorption characteristics can be regulated by changing the structural parameters of the as-proposed metamaterials. The as-designed metamaterials can be employed as efficient two-channel refractive index sensors, with a sensitivity and figure of merit of 288 nm/RIU and 150 RIU-1 for the first band, and a sensitivity and figure of merit of up to 204 nm/RIU and 163.2 RIU-1 for the second band. This work not only opens up a new design idea for the realization of dual-band perfect absorber synchronously with ultra-narrow linewidth, but also provides potential attractive candidates for developing dual-frequency channel sensors.

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Section: Modeling and Methodsmentioning

confidence: 99%

Ultra-narrow dual-band perfect absorber based on double-slotted silicon nanodisk arrays

Yang,

Luo,

et al. 2024

J. Phys. D: Appl. Phys.

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“…In our earlier simulation study, we showed that stable anapoles can also be formed in simple structures such as high refractive index Tellurium cubes 54 . Tailoring the formation of anapoles is highly useful in the areas of communication and stealth technologies and has been achieved till now by tailoring the geometries 55 , periodicity 56 and active materials 57 . In the current work, we numerically investigate the effect of electrically driven anisotropic LC medium on tailoring the anapole states and their orientations in near and farfield, thus opening up various possibilities in applications of programmable non-radiative modes.…”

Section: Tailoring the Resonant Modes In Liquid Crystal Based All-die...mentioning

confidence: 99%

Tailoring the resonant modes in liquid crystal based all-dielectric metasurfaces

Sakhare

Atmakuri

Dontabhaktuni

2023

Sci Rep

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High refractive index dielectic metasurfaces are being increasingly studied for their novel light-matter interactions such as Huygen’s lens, absolute transmission and complete absorption. Liquid crystal is a versatile medium with high dielectric anisotropy and hence interaction of light with the dielectric metasurfaces immersed in liquid crystal medium show complex behaviour compared to isotropic media. Most of the investigations on liquid crystal based electromagnetic response of dielectric metasurfaces focus on tunability of resonant frequencies and switching between the resonant states as a function of external stimuli such as electric field, temperature, etc. In the current work we present a detailed numerical investigation based on studies of scattering response, near-field and far-field radiation profiles of cubic Tellurium metasurfaces as a function of liquid crystal orientations in infrared frequencies. We show that the near-field and far-field radiation profiles of primary resonant modes—electric dipoles and magnetic dipoles reorient as a function of liquid crystal orientations. In particular, we study the effect of liquid crystal orientations on novel non-radiative states called anapoles. It is observed that liquid crystal orientations effect the excitation and orientation of anapole states within the Tellurium structures. This paves way for design of an electrically-driven switch between non-radiative and radiative states. Further, controlling the near-field and far-field radiation profiles opens up possibilities in designing liquid crystal based tunable multi-functional metasurfaces which can change the directionality of incident light.

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“…In comparison to metallic metamaterials, high refractive index dielectric nanomaterials exhibit negligible dissipation loss and superior heat resistance, while supporting strong electromagnetic multipole resonances at operating wavelengths [23][24][25][26]. This provides convenience for manipulating the interaction between light and matter.…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation on high quality anapole resonator with large electric field concentration in all-dielectric metasurface

Liu,

Wang,

Xiong

et al. 2024

Phys. Scr.

Self Cite

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In the field of nanophotonics, the manipulation of light using high refractive index dielectric materials has garnered significant attention in recent years. This occurs because dielectric materials with a high refractive index demonstrate lower losses in comparison to metallic plasmonic materials. Furthermore, the interference between internal toroidal dipole moment and electric dipole moment leads to destructive interference in the radiation field, resulting in the formation of an anapole state and localization of energy in the near-field. In this work, we initially excite the anapole state in a silicon nanodisk with a periodic nanostructured disk. By introducing a cross slit and adjusting the structural parameters, the anapole state is further optimized, and achieving highly concentrated near-field energy within the cross air slit of the silicon nanodisk. Specially designed, with a full width half-maximum (FWHM) of the transmitted spectrum of only 0.09nm, and a Q factor of up to 9745, close to 104. Additionally, the structure can produce up to 571 times the electric field enhancement. The remarkable performance of a high Q factor and localized near-field energy holds great potential for various applications, including enhancing nonlinear effects, surface enhanced Raman scattering (SERS) and designing nanolasers.

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Anapole Manipulation in Tailored Si Nanocubes for Near-Field Enhancement and High Q-Factor Resonance

Cited by 12 publications

References 57 publications

Ultra-narrow dual-band perfect absorber based on double-slotted silicon nanodisk arrays

Ultra-narrow dual-band perfect absorber based on double-slotted silicon nanodisk arrays

Tailoring the resonant modes in liquid crystal based all-dielectric metasurfaces

Numerical simulation on high quality anapole resonator with large electric field concentration in all-dielectric metasurface

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