Modal analysis on resonant excitation of two-dimensional waveguide grating filters

Zhou, Jianyu; Sang, Tian; Li, Junlang; Wang, Rui; Wang, La; Wang, Benxin; Wang, Yueke

doi:10.1016/j.optcom.2017.08.043

Cited by 11 publications

(3 citation statements)

References 25 publications

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“…For periodic structures illuminated by plane waves, the following conditions should be satisfied [19,20]: 2 Journal of Sensors n 0 sin θ mn sin ϕ mn = sin θ cos ϕ…”

Section: Methodsmentioning

confidence: 99%

Resonant Excitation Analysis of the Absorption Enhancement of L-Shaped Metasurfaces in Midinfrared Band

Feng

2022

Journal of Sensors

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Surface plasmon waveguides have attracted a lot of attention in recent years due to their ability to conduct light in the subwavelength scale. A large number of metallic structures have been used as waveguides and applied in integrated photonic circuits. Among these structures, the metal-insulator-metal surface plasmon waveguide is considered to have unique advantages. Compared to other waveguide forms, it is more compact and thus easier to integrate into optical circuits. For these reasons, we investigated the transmission properties of surface plasmon waves in metal-insulator-metal waveguides and built a MIM absorber consisting of gold and dielectric. We developed an interference model for the MIM absorber and concluded that the interactions between the metal patch and the substrate are not negligible in the near field. In addition, magnetic resonance plays an equally important role in approaching uniform absorption. Absorption spectra with different structural parameters, incidence angles, and polarizations were investigated. A sharp absorption peak was also found to be caused by the Rayleigh anomaly. The study reported in this paper contributes to further understanding of the physical properties of the MIM absorber, and we expect to refine the theoretical model in the future to eliminate the bias caused by near-field coupling.

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“…For periodic structures illuminated by plane waves, the following conditions should be satisfied [19,20]: 2 Journal of Sensors n 0 sin θ mn sin ϕ mn = sin θ cos ϕ…”

Section: Methodsmentioning

confidence: 99%

Resonant Excitation Analysis of the Absorption Enhancement of L-Shaped Metasurfaces in Midinfrared Band

Feng

2022

Journal of Sensors

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“…As can be seen in Fig. 2(a), high-order resonant modes are occurred as the thickness of the sublayer is increased, and the refection response of the ZCG become more complicated due to the hybridization of multiple resonances, which is significantly different from those low-contrast gratings [23], [24]. In particular, in the near-wavelength regime, where the grating period is confined between the wavelengths inside the grating material and its surrounding media with λ/n < < λ, mirror effect of the ZCG can be realized due to the overlapping of multiple resonant modes.…”

Section: Resultsmentioning

confidence: 99%

Resonant Excitation Analysis on Asymmetrical Lateral Leakage of Light in Finite Zero-Contrast Grating Mirror

Sang

Yin

et al. 2020

IEEE Photonics J.

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Resonant excitation analysis on asymmetrical lateral leakage of light in the finite zero-contrast grating (ZCG) mirror is demonstrated, and the size effect of the excited source is investigated. The dispersion equation of slab waveguide for the TM mode is proposed to evaluate the resonant condition of the ZCG mirror, and it is shown that the mirror effect of the infinite ZCG is resulted from the overlapping of order-mode resonance pairs. However, two leaky channels are excited in spectra of the finite ZCG mirror for the normal-incident Gaussian source, where bound states in the continuums (BICs) turn into quasi-BICs as the angular component is nonzero. The leaky channels are confined in the grating layer and the sublayer, and they are all transferred from the symmetrical mode to the asymmetrical mode along the lateral direction from the center of the ZCG. The asymmetrical loss of the lateral leakage of light relative to incidence direction, in principle, can break reflection reciprocity of the symmetrical system of the finite ZCG mirror. By changing the excited source from the grating side to the sublayer side, the lateral leakage of light of the finite ZCG mirror can be efficiently reduced.

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“…For the CNA-based metasurface at normal incidence, whether a diffraction order propagates or not in the background can be written as [53]…”

Section: Structure and Designmentioning

confidence: 99%

Cascaded Nanorod Arrays for Ultrabroadband, Omnidirectional and Polarization-Insensitive Absorption

Wang

Sang

et al. 2020

Applied Sciences

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An ultrabroadband, omnidirectional, and polarization-insensitive absorber based on cascaded nanorod arrays (CNAs) is numerically demonstrated, and an average absorptivity of 98.2% with a relative absorption bandwidth (RAB) of 149.8% can be achieved in the 0.38–2.65 μm wavelength range. The proposed CNA-based absorber requires only several pairs of multilayers to achieve excellent absorption performance. More significantly, the physical mechanism for this intriguing ultrabroadband absorption results from the synergistic effect of localized surface plasmon (LSP) and plasmonic resonant cavity (PRC) modes, which is fundamentally different from the tapered metal/dielectric multilayer-based absorbers associated with the slow-light mode. We investigated the absorption properties of the CNA-based metasurface by using the impedance theory, which indicates that the impedance of the structure matches well with the impedance of the free space from the visible to near-infrared wavelength range. In addition, the absorption properties of the CNA-based metasurface are robust to the variation of the structural parameters and the metal/dielectric materials, and ultrabroadband absorption performance can be maintained within 0–60° for both TM and TE modes.

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Modal analysis on resonant excitation of two-dimensional waveguide grating filters

Cited by 11 publications

References 25 publications

Resonant Excitation Analysis of the Absorption Enhancement of L-Shaped Metasurfaces in Midinfrared Band

Resonant Excitation Analysis of the Absorption Enhancement of L-Shaped Metasurfaces in Midinfrared Band

Resonant Excitation Analysis on Asymmetrical Lateral Leakage of Light in Finite Zero-Contrast Grating Mirror

Cascaded Nanorod Arrays for Ultrabroadband, Omnidirectional and Polarization-Insensitive Absorption

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