Ultranarrow perfect absorber with linewidth down to 1 nm based on optical anapole mode

Li, Ran; He, Mengyue; Wang, Junqiao; Zhao, Wenchao; Sun, Shikun; Mao, Yu; Tian, Shuo; Chen, Fan

doi:10.1016/j.rinp.2022.105484

Cited by 16 publications

(12 citation statements)

References 32 publications

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“…Such a novel dielectric photonic state provides potential applications in local near-field enhance- ment, 29,30 nonlinear optical effect, 31−34 photocatalysis, 35−37 and refractive index sensors. 38,39 A strong field enhancement up to several times localized in the center of the resonator was obtained due to the excited anapole state in isolated nanoparticles. 40 Other configurations have also been found to exhibit higher field enhancement.…”

Section: ■ Introductionmentioning

confidence: 98%

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

Sun

Mao

et al. 2022

ACS Appl. Nano Mater.

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Dielectric materials exhibit negligible dissipative losses and strong electromagnetic multipolar optical responses at operating wavelengths compared to metallic materials. In a high-refractive-index dielectric, the destructive interference of the radiation fields from electric and toroidal dipole moments results in the anapole, which has the optical properties of a dark state and cannot emit energy in the far-field region. This study uses periodic Si nanocubes (SN) to support anapole excitation with lattice resonance based on numerical simulation and manipulates the anapole by tailoring structures according to the electromagnetic field distribution characteristics of the anapole. Long slits are introduced in the center to regulate the electric dipole moments, and elliptical holes are opened on both sides to adjust the current distribution and thus influence the toroidal dipole moments. The reflection resonance peak of tailored Si nanocubes shows a narrow bandwidth of 0.11 nm and a large Q-factor of 8053. Also, their reflection resonance peak shows more than 237 times the electric field enhancement in the dielectric. The tailored Si nanocubes provide an alternative to plasmonic metal to support hot spots and achieve near-field enhancement, which can be applied to enhance photon emission, surface-enhanced Raman scattering (SERS), and photocatalysis.

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Section: ■ Introductionmentioning

confidence: 98%

“…By exciting the anapole, tailored dielectric nanomaterials can provide similar opportunities to their metallic counterparts. Such a novel dielectric photonic state provides potential applications in local near-field enhancement, , nonlinear optical effect, − photocatalysis, − and refractive index sensors. , …”

Section: Introductionmentioning

confidence: 99%

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

Sun

Mao

et al. 2022

ACS Appl. Nano Mater.

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“…In recent years, research in anapole states is gaining momentum, and such states are widely explored in dielectric nanostructures. − In such kinds of structures, upon excitation with plane waves, the net magnetic dipole (MD) moment becomes zero owing to the asymmetric distribution of the magnetic field. By structural optimization, the electric dipole (ED) moment can be suppressed by destructively interfering with the electric toroidal dipole (ETD), hence giving rise to the well-explored “electric anapole” in high-refractive-index structures .…”

Section: Introductionmentioning

confidence: 99%

Finite-Element Method Simulations of the Tunable Magnetic Anapole State in an All-Graphene Metasurface: Implications for Near-Field Sensing, Nanoscale Optical Trapping, and Cloaking

Roy

Debnath

2023

ACS Appl. Nano Mater.

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In this article, we have proposed an all-graphene metasurface where the magnetic anapole state can be dynamically tuned. The structure is composed of two layers of graphene separated by a dielectric spacer on an oxide substrate, forming a gap surface plasmons resonator structure in the long-wavelength infrared region. The top graphene layer is patterned into interconnected disks, while the interconnection is for electrical tuning purposes only. By multipolar analysis using the finiteelement method (FEM) simulation, we have shown that at the particular dimension, the dominant electric dipole scattering can be minimized. This happens at the resonant point where along with the electric dipole suppression, the magnetic and magnetic toroidal dipoles destructively interfere, which gives rise to a magnetic anapole state. This resonant point can be tuned in two ways, either passively, which is the lithographical variation of structure parameters, or actively, by harnessing the chemical potential of the graphene. We have shown here both mechanisms whereby actively tuning we can shift the magnetic anapole to the far-infrared region. Through the interplay of multipole analysis, we have shown that by varying the angle of incidence, we can control the radiating channels, which can be termed an anapole switch. For the active tuning cases, by voltage mapping of the chemical potential, we have shown the effect of chemical potential on the components of the multipolar families. Our device concept and such implementations hold promise for the application in near-field sensing, nanoscale optical trapping, cloaking, etc.

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“…The fundamental physics of anapoles can be qualitatively explained by Mie theory [36,37], which identifies the conditions for the anapole state to occur when the scattering amplitudes are zero [38,39]. Because of their ability to suppress farfield scattering and enhance near-field effects, anapoles have diverse applications in fields such as optical cloaking [40], absorbers [41][42][43], sensors [44][45][46], nanolasers [47], photothermal effects [48], and nonlinear optical enhancements [49,50].…”

Section: Introductionmentioning

confidence: 99%

The anapole state excited by an oblique incidence

et al. 2023

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Anapole states supported by high-refractive-index dielectric nanoparticles have mostly been studied under normal incidence, but this work explores the oblique incidence excitation. For a single silicon nanodisk, as the incident angle (θ) increases, the anapole wavelength undergoes a gradual blueshift, while the wavelength of maximum near-field enhancement remains almost unchanged with increasing E-field enhancement factor (|E/E0|) due to phase retardation effect caused by oblique incidence, and some unique features in field distributions differed from normal excitation are exhibited. In the case of a silicon nanodisk array, the anapole state and near-field enhancement are affected by near-field coupling and the phase retardation effect is weakened. With increasing θ, the anapole wavelength and maximum field enhancement wavelength both blue shift. The y-direction coupling occurs in anapole wavelength and diagonal direction coupling occurs in the maximum field enhancement wavelength. Oblique incident excitation gives us a deeper understanding of anapole state and may have potential applications in nanophotonics.

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Ultranarrow perfect absorber with linewidth down to 1 nm based on optical anapole mode

Cited by 16 publications

References 32 publications

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

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

Finite-Element Method Simulations of the Tunable Magnetic Anapole State in an All-Graphene Metasurface: Implications for Near-Field Sensing, Nanoscale Optical Trapping, and Cloaking

The anapole state excited by an oblique incidence

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