Magnetically tunable broadband transmission through a single small aperture

Bi, Ke; Liu, Wenjun; Guo, Yunsheng; Dong, Guoyan; Lei, Ming

doi:10.1038/srep12489

Cited by 8 publications

(3 citation statements)

References 34 publications

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“…K. Bi’s group reported an enhanced transmission by utilizing the Mie resonances of two high-permittivity low-loss ceramic particles located at either side of a metallic aperture [32]. Then, they experimentally and theoretically demonstrated the magnetically tunable dual-band transmission by placing two pairs of dielectric cubes and ferrite cuboids symmetrically on both sides of the single subwavelength aperture [33,34]. Thermally tunable enhanced transmission through a subwavelength metallic aperture was also realized by a dielectric-based metamaterial resonator with high temperature coefficient [35].…”

Section: Introductionmentioning

confidence: 99%

Near-Field Enhancement and Polarization Selection of a Nano-System for He-Ne Laser Application

Wang

Chu

et al. 2019

Nanomaterials

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In this paper, we focus on transmission behavior based on the single aperture with a scatter. Both the near-field enhancement and polarization selection can be achieved numerically with a proposed nano-system under He-Ne laser wavelength. The nano-system consists of an Ag antenna, a wafer layer, an Ag film with an aperture and a dielectric substrate. Numerical results show that the near-field enhancement is related to the FP-like resonance base on surface plasmon polaritons (SPPs) in the metal–isolator–metal (MIM) waveguide for transverse magnetic (TM) polarization. The near-field optical spot is confined at the aperture export with a maximal electric intensity 20 times the value of the incident field for an antenna length of 430 nm. The transmission cutoff phenomenon for transverse electric (TE) polarization is because the transmission is forbidden for smaller aperture width. High extinction ratios of 9.6×10−8 (or 70.2 dB) and 4.4×10−8 (or 73.6 dB) with antenna lengths of 130 nm and 430 nm are achieved numerically with the nano-system. The polarization selective property has a good angular tolerance for oblique angles smaller than 15°. The spectral response is also investigated. We further demonstrate that the nano-system is applicable for another incident wavelength of 500 nm. Our investigation may be beneficial for the detection of polar molecules or local nano polarized nanosource.

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Section: Introductionmentioning

confidence: 99%

Near-Field Enhancement and Polarization Selection of a Nano-System for He-Ne Laser Application

Wang

Chu

et al. 2019

Nanomaterials

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“…The FMR frequency of the ferrite can be expressed by 20 where γ is the gyromagnetic ratio, H is the applied magnetic field, M s is the saturation magnetization, N x , N y , and N z are the demagnetization factor at x , y , and z directions, respectively. Based on the above FMR theory, extraordinary transmission can be realized by combining the ferrite rods with the metallic foils 21 . When the FMR takes place at the resonance frequencies, the ferrite rods act as waveguides which can efficiently transmit the electromagnetic wave through the metasurface.…”

Section: Resultsmentioning

confidence: 99%

Wave manipulation with magnetically tunable metasurfaces

Yang

Wang

et al. 2017

Sci Rep

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Tunable metasurfaces have emerged as an efficient approach to manipulate the wave propagation. Different from previous work concentrating on electrically tunable mechanisms, here we demonstrate a magnetically tunable metasurface composed of ferrite rods and metallic foils. By tuning the thickness of ferrite rods, metasurfaces with different rod thickness gradients are obtained. The incident wave can propagate through the metasurfaces due to the extraordinary transmission. The deflection angle of the transmission wave is not only influenced by the rod thickness gradient, but also tuned by the applied magnetic field. This approach opens a way for the design of tunable metasurfaces.Manipulation of electromagnetic (EM) waves (e.g., for phase modulation, light absorption, and imaging applications) has long been restricted by the limited range of EM parameters among natural materials. Electromagnetic metamaterials are composites in which subwavelength features, rather than the natural ones, control the macroscopic electromagnetic properties 1-3 . The unique metamaterial structure makes it possible to achieve considerable electromagnetic response by just using a slab of metamaterial which is much thinner than a wavelength 4 . Metasurface is an ultrathin planar metamaterial comprising artificially designed arrays of subwavelength resonating units, which has attracted significant interests in the optics community 5,6 . The key point for metasurface is to use resonating unit arrays with subwavelength separation and spatially varying geometric parameters (for example, resonating unit shape, size, orientation) to induce a spatially varying optical response, especially the abrupt changes to the phase and amplitude of the incident wave 7-10 . Therefore, they offer much more opportunities for the control of EM waves than traditional materials.Recently, several kinds of metasurfaces have been designed and many interesting phenomena have been exploited [11][12][13][14] . A metasurface made of "v-shaped" antennas can realize anomalous reflection/refraction of impinging light, which cannot be explained by the classical Snell's law 15 . Another metasurface perforated with an array of coaxial annular apertures obtained highly efficient beam steering. In spite of the aboved achievements on metasurfaces, the realization of high performance metasurface-based devices still remains a great challenge due to very limited tuning ranges and modulation depths. Great efforts have been paid in developing tunable metasurfaces 16,17 . Yao et al. demonstrated electrically tunable metasurface absorbers with strong light modulation effect by incorporating a metasurface on graphene into an asymmetric Fabry−Perot resonator 18 . Ee et al. proposed a mechanically reconfigurable metasurface by fabricating Au nanorod arrays on a stretchable polydimethylsiloxane substrate 19 . The anomalous refraction angle induced by such a metasurface can be adjusted from 11.4° to 14.9° by stretching the substrate by 30%. It is well known that, besides the electrically a...

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“…Compared to metallic MMs, dielectric MMs may have the advantage of tunable working frequency. Some temperature-sensitive materials such as VO 2 , titanates and magnetically tunable ferrites have been introduced to MM systems, resulting in frequency-tunable EM resonances and also tunable negative refraction, absorber, and so on 18 19 20 21 . Nevertheless, the previous mechanisms usually continuously tune the frequency in a limited range without involving the change of resonant mode, which may limit the application in broadband tunable devices and EM switch.…”

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confidence: 99%

Mode jumping of split-ring resonator metamaterials controlled by high-permittivity BST and incident electric fields

Zeng

Cui

et al. 2016

Sci Rep

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We investigate the resonant modes of split-ring resonator (SRR) metamaterials that contain high-permittivity BST block numerically and experimentally. We observe interesting mode-jumping phenomena from the BST-included SRR absorber structure as the excitation wave is incident perpendicularly to the SRR plane. Specifically, when the electric field is parallel to the SRR gap, the BST block in the gap will induce a mode jumping from the LC resonance to plasmonic resonance (horizontal electric-dipole mode), because the displacement current excited by the Mie resonance in the dielectric block acts as a current channel in the gap. When the electric field is perpendicular to the gap side, the plasmonic resonance mode (vertical electric-dipole mode) in SRR changes to two joint modes contributed simultaneously by the back layer, SRR and BST block, as a result of connected back layer and SRR layer by the displacement current in the BST dielectric block. Based on the mode jumping effect as well as temperature and electric-field dependent dielectric constant, the BST-included SRR metamaterials may have great potentials for the applications in electromagnetic switches and widely tunable metamaterial devices.

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Magnetically tunable broadband transmission through a single small aperture

Cited by 8 publications

References 34 publications

Near-Field Enhancement and Polarization Selection of a Nano-System for He-Ne Laser Application

Near-Field Enhancement and Polarization Selection of a Nano-System for He-Ne Laser Application

Wave manipulation with magnetically tunable metasurfaces

Mode jumping of split-ring resonator metamaterials controlled by high-permittivity BST and incident electric fields

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