Electromagnetically induced transparency of a plasmonic metamaterial light absorber based on multilayered metallic nanoparticle sheets

Okamoto, Koichi; Tanaka, Daisuke; Degawa, Ryo; Li, Xinheng; Wang, Pangpang; Ryuzaki, Sou; Tamada, Kaoru

doi:10.1038/srep36165

Cited by 29 publications

(37 citation statements)

References 36 publications

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“…The peaks of the extinction spectra were split into two other peaks. However, this phenomenon was not observed in the case of the 3D nanosheet on a transparent substrate [34]. This optical phenomenon should be attributed to the mode splitting effect induced by the strong coupling, and suggests that the 3D Ag nanosheet structures can act as plasmonic metamaterials.…”

Section: Optical Properties Of Nhommentioning

confidence: 90%

“…The nanohemispheric structures were formed with this method. For comparison, the SEM image of the two-dimensional (2D) nanosheet structures of Ag nanoparticles on silicon substrate reported in [33,34] is also shown in Figure 1(d). The Ag nanoparticles with 5 nm diameter were synthesized by the thermal reduction of a silver acetate precursor.…”

Section: Methodsmentioning

confidence: 99%

“…Figure 2(a) shows the extinction spectrum converted from the acquired transmission spectrum of the fabricated Ag NHoG structure with a thickness of 10 nm of the SiO 2 spacer layer. The extinction spectrum for the 2D Ag nanosheet structure on quartz substrate [33,34] is also shown in Figure 2(a). Both spectra contain peaks that are attributed to the localized SP resonance mode at approximately 500 nm.…”

Section: Methodsmentioning

confidence: 99%

“…We recently found unusual optical properties associated with the multilayers of the Ag nanosheet (3D nanosheet) located on metal substrates with thicknesses of ∼100 nm [34]. The peaks of the extinction spectra were split into two other peaks.…”

Section: Optical Properties Of Nhommentioning

confidence: 99%

“…The use of metal nanoparticle array structures to control localized SP modes is a promising method. Quite recently, we found unusual optical properties of threedimensional multilayers of silver (Ag) nanosheet located on metal substrates [33,34]. The peaks of the extinction spectra were split into two peaks, but this phenomenon was not observed on a transparent substrate.…”

Section: Introductionmentioning

confidence: 98%

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Flexibly tunable surface plasmon resonance by strong mode coupling using a random metal nanohemisphere on mirror

et al. 2020

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AbstractWe propose a unique random metal nanohemisphere on mirror (NHoM) structure to tune the surface plasmon (SP) resonance in a flexible manner. The SP resonance peak was split into two peaks owing to the strong coupling between the SP mode in the metal nanohemisphere and the mirror image mode generated in the metal substrate. This phenomenon is based on the fact that the strong coupling and the induced electromagnetic effects are similar to those pertaining to the Rabi splitting, Fano resonance, and electromagnetically induced transparency, thus providing quantum effect analogies. These phenomena have recently attracted increased attention and have been studied with nanocavities fabricated with top-down nanotechnologies. Compared with previous reports, NHoM structures can be fabricated in a much easier manner and are tunable in rather wider wavelength regions without nanofabrication technologies. The SP resonance peaks were enhanced, sharpened dramatically, and tuned flexibly, based on the optimization of the thickness of the spacer layer between the metal hemisphere and metal substrate. Experimental results were reproduced and were explained based on finite difference time domain (FDTD) simulations. These phenomena have never been observed previously on similar nanosphere on mirror (NSoM) because nanohemispherical structures were required. The NHoM nanocavity structure has a quality factor >200 that is surprisingly high for the localized SP mode of nanoparticles. Flexible tuning of the SP resonance with the use of NHoM is envisaged to lead to the development of new applications and technologies in the field of plasmonics and nanophotonics.

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Section: Optical Properties Of Nhommentioning

confidence: 90%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Optical Properties Of Nhommentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

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Flexibly tunable surface plasmon resonance by strong mode coupling using a random metal nanohemisphere on mirror

et al. 2020

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Ultrasensitive Refractive Index Sensing Based on the Quasi‐Bound States in the Continuum of All‐Dielectric Metasurfaces

Hsiao

Hsu

Liu

et al. 2022

Advanced Optical Materials

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give rise to a high-Q resonance along with its characteristic asymmetric spectral line shape. [15] Recently, a generalized concept known as bound states in the continuum (BIC) has been proposed to unify metaatoms with broken in-plane inversion symmetry, and the relationship between the structural asymmetry and the Q-factor of resonances was found to be well described by a characteristic inverse-square law. [16] Such symmetry-protected BIC originates from the forbidden coupling between the eigenmodes of resonators and the external propagating modes due to their symmetry mismatch, thus resulting in a localized state embedded in the continuum. Ideally, the BIC exhibits infinite Q-factor in a symmetry-preserved nanostructure so that it is not observable in the spectrum due to its vanishing spectral linewidth. [16] In practice, by introducing the symmetry breaking into the in-plane geometry, the quasi-BIC mode with the finite Q-factor and linewidth can be tailored by adjusting the degree of structural asymmetry, thus providing a useful platform to readily access extremely high Q-factor resonances.Recently, the quasi-BICs with ultrahigh Q-factor have been realized in various photonic systems including waveguides, [17] photonic crystals, [18] plasmonic nanostructures, [19][20][21][22] and dielectric resonators. [23] Among these demonstrations, a variety of metallic and dielectric nanostructures were used in refractive index (RI) sensing applications as the narrower resonant linewidth is beneficial for measuring small resonant shifts (Table S1, Supporting Information). [24] Generally, plasmonic sensors based on the usage of either surface plasmon polaritons or localized surface plasmons benefit from their intense optical field on the surface of metallic nanostructures [25] and thus are capable of performing significant spectral variation when external RI changes. However, the accompanied dissipative loss leads to the broadening of the resonant linewidth simultaneously. In contrary, high-index dielectric metasurfaces have emerged as a promising alternative to exhibit a much narrower resonant linewidth owing to the lack of Ohmic loss. [26,27] Thus, various asymmetric dielectric nanostructures, such as tilted elliptical nanodisk pairs, [28,29] asymmetric paired nanorods, [30][31][32] asymmetric crescent shape, [33] nanodisks with asymmetrically distributed holes, [7,34] nanobricks with symmetric or asymmetric defects, [8,35] have been demonstrated to support high-Q Symmetry-protected quasi-bound states in the continuum (BIC) controlled by metasurfaces with broken in-plane symmetry are widely exploited to achieve highly surface-sensitive and spectrally sharp resonances for nanophotonic biosensors. Through the engineering of silicon-based asymmetric nanobar pairs, a quasi-BIC mode is excited showing a dominant toroidal dipole (TD) and electric quadrupole (EQ) resonant feature in the near-infrared and performs ultrahigh sensitivity in the refractometric monitoring of local environment changes. Contrary to the typical electric ...

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Transient Nascent Adhesion at the Initial Stage of Cell Adhesion Visualized on a Plasmonic Metasurface

Lee

Kuboki

Kidoaki

et al. 2021

Advanced NanoBiomed Research

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Electromagnetically induced transparency of a plasmonic metamaterial light absorber based on multilayered metallic nanoparticle sheets

Cited by 29 publications

References 36 publications

Flexibly tunable surface plasmon resonance by strong mode coupling using a random metal nanohemisphere on mirror

Flexibly tunable surface plasmon resonance by strong mode coupling using a random metal nanohemisphere on mirror

Ultrasensitive Refractive Index Sensing Based on the Quasi‐Bound States in the Continuum of All‐Dielectric Metasurfaces

Transient Nascent Adhesion at the Initial Stage of Cell Adhesion Visualized on a Plasmonic Metasurface

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