Line shape engineering of sharp Fano resonance in Al-based metal-dielectric multilayer structure

Hayashi, Shinji; Fujiwara, Yudai; Kang, Byungjun; Fujii, Minoru; Nesterenko, Dmitry V.; Sekkat, Zouheir

doi:10.1063/1.5002715

Cited by 20 publications

(27 citation statements)

References 45 publications

(84 reference statements)

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“…S2(a) and S2(b) in the supplementary material indicate that the shape of the present Fano resonance is sensitive to Δκ DR1-PS and not sensitive to Δn DR1-PS . Furthermore, the position of the present Fano resonance is insensitive to both Δκ DR1-PS and Δn DR1-PS ; since the central position of the Fano resonance normally coincides with that of the sharp mode (PWG mode in the present sample), 25,26,42,43 it is not very much affected by the changes in the optical constants governing the broad mode (HLG mode). From these calculated results of ATR spectra, along with those of absorption spectra presented in Figs.…”

Section: E Mechanism Of Line Shape Modulation By Lightmentioning

confidence: 70%

“…[1][2][3]12,13 In recent years, we have pursued studies of the Fano resonance in simple multilayer structures both experimentally and theoretically. [18][19][20][21][22][23][24][25][26][27] The samples studied are metal-dielectric-dielectric (MDD) threelayer structures [18][19][20][21][22]25,27 and all-dielectric four-layer (DDDD) structures, 26 which are attached to a high-index prism to construct a Kretschmann attenuated-total-reflection (ATR) configuration. We demonstrated that in angle-scan ATR spectra of these samples, sharp Fano line shapes are generated and can be controlled easily.…”

Section: Introductionmentioning

confidence: 99%

“…Based on the results of electromagnetic (EM) calculations, we clarified the origins of the Fano resonances; in the MDD structure, the resonance originated from the coupling of a broad surface plasmon polariton (SPP) mode propagating at the MD interface with a sharp planar waveguide (PWG) mode supported by the outermost D waveguide layer, [18][19][20][21][22]25,27 while in the DDDD structure, the coupling between a broad PWG mode and a sharp PWG mode is responsible for the generation of the resonance. 26 The Q-factor achieved in the DDDD structure is as high as 2800.…”

Section: Introductionmentioning

confidence: 99%

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Light-controllable Fano resonance in azo-dye-doped all-dielectric multilayer structure

Motokura

Kang

Fujii

et al. 2019

Journal of Applied Physics

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Active modulation of Fano resonance by light is demonstrated for an all-dielectric multilayer system containing an azo-dye-doped layer. The sample studied consists of a polystyrene layer doped with disperse red 1 (azo dye) molecules, a polyvinyl alcohol layer, and a pure polystyrene layer. In a Kretschmann attenuated-total-reflection configuration, angle-scan reflection spectra of the sample were measured with blue probe light under blue light pumping. The Fano line shape was found to change systematically depending on the intensity of the pump light. Analyses based on electromagnetic calculations of the spectra and field distributions in the layers indicate that the Fano resonance observed is generated by coupling between a broad half-leaky guided mode supported by the azo-dye-doped layer and a sharp planar waveguide mode supported by the pure polystyrene layer. The systematic changes in the Fano line shape under pump light irradiation can be well understood by a systematic decrease in light absorption in the azo-dye-doped polystyrene layer; the decrease in light absorption is due to a decrease in the extinction coefficient of the layer arising from the photoisomerization of azo dye molecules.

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Section: E Mechanism Of Line Shape Modulation By Lightmentioning

confidence: 70%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Light-controllable Fano resonance in azo-dye-doped all-dielectric multilayer structure

Motokura

Kang

Fujii

et al. 2019

Journal of Applied Physics

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“…Symmetry breaking in planar photonic crystals results in a well-known phenomenon of introducing sharp Fano resonances excitable by free-space illumination [31,[40][41][42][43][44][45][46]. There are two requirements for such a feature to be observed at normal incidence: (1) a mode must exist in the band diagram at the center ("Gamma point") of the First Brillouin Zone (FBZ) and (2) the mode must not be excluded by symmetry considerations.…”

Section: Symmetry Breaking In Planar Photonic Crystalsmentioning

confidence: 99%

Dimerized high contrast gratings

2018

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Metasurfaces and planar photonic crystals are two classes of subwavelength diffractive optical devices offering novel functionalities. The former employ independently operating subwavelength “meta-units” as their building blocks, while the latter exploit the collective response of many periodic building blocks. High contrast gratings (HCGs) are an example of one-dimensional (1D) planar photonic crystals with large refractive index contrast, exhibiting large in-plane scattering even with a limited number of grating periods. They are best known for their broadband features. Low contrast gratings (LCGs) are known for their control over sharp spectral features but require many periods due to small in-plane scattering. We explore a class of symmetry-broken HCGs called dimerized high contrast gratings (DHCGs), which have a period-doubling perturbation applied. DHCGs support modes accessible by free-space illumination with a long, controllable photon lifetime (inversely proportional to the magnitude of the perturbation) and reduced lateral energy divergence (confined by the high index contrast of the grating). We catalogue and clarify the resonant modes introduced by the dimerizing perturbation in 1D DHCGs and briefly explore the increased in-plane scattering present in two-dimensional (2D) DHCGs. We introduce an approach maximizing lateral localization by band structure engineering in the unperturbed HCG and using the dimerizing perturbation to generate sharp spectral features in devices with small footprint. We confirm the simultaneous control of photon lifetime and lateral localization with full-wave simulations of finite-sized DHCGs. We conclude by numerically demonstrating two compact devices (an optical modulator and a refractive index sensor) benefitting from the unique design freedoms of DHCGs.

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“…The state of the art for SPR coupled PWG sensors is that there are several publications [22][23][24][25][26][27] proposing theoretical designs, but there are only some few reports of experimental results; experimental studies published at the present are based on plasmonic metals like Ag, Al, Au and one based on Ge-doped SiO 2 [15,[28][29][30]. In this paper we report, firstly, the experimental observation of SPPs in the Kretschmann configuration produced at a TiN/air interface.…”

Section: Introductionmentioning

confidence: 93%

High Sensitive Biosensors Based on the Coupling Between Surface Plasmon Polaritons on Titanium Nitride and a Planar Waveguide Mode

Asencios

Moro

Luyo

et al. 2020

Sensors

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High sensitivity biosensors based on the coupling of surface plasmon polaritons on titanium nitride (TiN) and a planar waveguide mode were built; they were proved by sensing three different media: air, water and dried egg white; sensors described here could be useful for sensing materials with a refractive index between 1.0 and 1.6; in particular, materials of biological interest with a refractive index in the range 1.3–1.6, like those containing biotin and/or streptavidin. They were built by depositing Nb2O5/SiO2/TiN multilayer structures on the flat surface of D-shaped sapphire prisms by using the dc magnetron sputtering technique. Attenuated total reflection (ATR) experiments in the Kretschmann configuration were accomplished for the air/TiN/Prism and S/Nb2O5/SiO2/TiN/Prism structures, S being the sample or sensing medium. ATR spectra for plasmons at the TiN/air interface showed a broad absorption band for angles of incidence between 36 and 85°, with full width at half maximum (FWHM) of approximately 40°. For the S/Nb2O5/SiO2/TiN/Prism structures, ATR spectra showed a sharp reflectivity peak, within the broad plasmonic absorption band, which was associated with Fano resonances. The angular position and FWHM of the Fano resonances strongly depend on the refractive index of the sensing medium. ATR spectra were fitted by using the transfer-matrix method. Additionally, we found that angular sensitivity and figure of merit increase with increasing the refractive index of the sensing medium.

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Line shape engineering of sharp Fano resonance in Al-based metal-dielectric multilayer structure

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Cited by 20 publications

References 45 publications

Light-controllable Fano resonance in azo-dye-doped all-dielectric multilayer structure

Light-controllable Fano resonance in azo-dye-doped all-dielectric multilayer structure

Dimerized high contrast gratings

High Sensitive Biosensors Based on the Coupling Between Surface Plasmon Polaritons on Titanium Nitride and a Planar Waveguide Mode

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