The anapole state excited by an oblique incidence

Tian, Shuo; Wang, Junqiao; Sun, Shikun; He, Mengyue; Mao, Yu; Ding, Pei

doi:10.1088/1402-4896/ace481

Cited by 6 publications

(1 citation statement)

References 60 publications

(70 reference statements)

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“…The high field enhancement effect and high Q factor achieved by this structure are superior to the dielectric nanostructure based on previous works [53,54], and even exceed those of the metal plasmonic structure [55]. This provides a new concept in nanolaser design, enhanced nonlinear effects, and surface enhanced spectroscopy applications.…”

Section: Anapole Manipulation In Silicon Nanodisk With Cross Slitmentioning

confidence: 80%

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

Liu,

Wang,

Xiong

et al. 2024

Phys. Scr.

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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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Section: Anapole Manipulation In Silicon Nanodisk With Cross Slitmentioning

confidence: 80%

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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Soft and hard trimming of imprint resist masks to fabricate silicon nanodisk arrays with different edge roughness

Takano,

Niinomi,

Oshikiri

et al. 2024

Journal of Vacuum Science &Amp; Technology B

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To investigate the formation mechanism of wrinkle structures in imprinted resist masks generated by oxygen reactive ion etching (O2 RIE), we compared UV/ozone exposure (soft trimming) and O2 RIE (hard trimming) as oxidative trimming methods to tune the diameters of disk resist masks in ultraviolet nanoimprint lithography of Mie-resonant silicon nanodisks (Si NDs). Variations in the residual layer thicknesses of the imprinted resin patterns demonstrated that the wrinkle structures around the disk resist masks increased after the residual layer was removed completely. A comparison between soft and hard trimming indicated that the UV/ozone exposure maintained a relatively small edge roughness of the disk resist masks during a reduction in diameter from 370 to 160 nm, whereas O2 RIE caused a large edge roughness owing to wrinkle structures with diameters below 300 nm. The wrinkled structures are likely to have originated from the wrinkling instability caused by the formation of an ion-damaged layer near the resist surfaces via O2 RIE involving ion bombardment, which could be transferred to a monocrystalline Si layer on a synthetic quartz substrate. Microscopic optical measurements revealed that 230 nm-diameter Si-ND arrays with small and large edge roughnesses exhibited almost identical reflection spectra at visible wavelengths.

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Wide angle anapole excitation in stacked resonators

Vennberg,

Angelsten,

Anttu

et al. 2024

Opt. Express

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In the search for resonances with high localized field strengths in all-dielectric nanophotonics, novel states such as anapoles, hybrid anapoles and bound states in the continuum have been realized. Of these, the anapoles are the most readily achievable. Interaction between vertically stacked disks supporting anapole resonances increases the field localization further. When fabricated from materials with high non-linear coefficients, such stacked disk pillars can be used as non-linear antennas. The excitation of such 3D pillars often includes off normal incidence when using focusing optics. Therefore, it is important to evaluate the angular and polarization response of such pillars. In the paper we fabricate pillars with three AlGaAs disks in a stack separated by stems of GaAs. The angular and polarization responses are evaluated experimentally with integrating sphere measurements and numerically through simulation, multipole decomposition and quasi-normal modes. We find that the stacked geometry shows hybridized anapole excitation for a broad span of incidence angles, with tunability of the individual multipolar response up to octupoles, including an electric octupole anapole, and we show how the average enhanced confined energy varies under angled excitation. The results show that the vertical stacked geometry can be used with highly focusing optics for efficient in-coupling to the hybridized anapole.

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The anapole state excited by an oblique incidence

Cited by 6 publications

References 60 publications

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

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

Soft and hard trimming of imprint resist masks to fabricate silicon nanodisk arrays with different edge roughness

Wide angle anapole excitation in stacked resonators

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