Double Fano resonance in a side-by-side gratings structure

Dana, Brenda; Bahabad, Alon

doi:10.1088/2040-8986/aad11a

Cited by 3 publications

(1 citation statement)

References 50 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The observed interparticle-distance dependent behavior can easily be explained by a model assuming strong coupling between two harmonic oscillators: the plasmon mode of the NP and the longitudinal plasmon mode of the NPs dimer. Both can be exhibit the Lorentzian lineshape [49,50]. Using the data analysis function of the Origin software can be deconvolved into the corresponding lorentz curve.…”

Section: Resultsmentioning

confidence: 99%

New coupling mechanism of titanium nitride nanosphere dimers at short separation distances

Cao

Chen²,

Liang³

et al. 2019

Nanotechnology

View full text Add to dashboard Cite

The coupled localized plasmon modes generated by a metal plasmonic nanoparticle (NP) dimer induces a stronger plasmon enhanced electromagnetic field as well as a stronger optical response compared to that of a single NP. Owing to the small Drude damping factor, however, the absorption bandwidth of noble metallic NPs is insufficiently broad. Herein, the near-field wide band coupling absorption for 25 nm diameter TiN nanospheres is investigated in a homo-dimer arrangement for various separation distances using the finite element method. An enhancement of the wide band coupling absorption and a red-shift is found, which can be explained by an uncomplicated dipole-dipole coupling model at interparticle distances greater than 5 nm. At short separation distances, the coupling absorption of the TiN dimer exhibits a tremendous change, which is diametrically opposite the results found for a Au dimer. This unexpected change phenomenon is shown by calculation and analysis to be owing to the change of the charge distribution approach at short separation distances, which is demonstrated to play a key role in the wide band coupling characteristic variation. With decreasing separation gap, a new coupling mechanism caused by surface charge properties is responsible for the decline in coupling absorption as well as the break in the ruler equations for both plasmon shift and temperature enhancement.

show abstract

Section: Resultsmentioning

confidence: 99%

New coupling mechanism of titanium nitride nanosphere dimers at short separation distances

Cao

Chen²,

Liang³

et al. 2019

Nanotechnology

View full text Add to dashboard Cite

show abstract

Electromagnetic theory of double Fano resonances in plasmonic nanostructures and metamaterials

Lishchuk

2022

Phys. Rev. B

View full text Add to dashboard Cite

Dual and narrow-band optical filtering and sensing enabled by asymmetric dielectric metagratings

Abudula,

Abulaiti,

Mohamedsedik

et al. 2024

Opt. Mater. Express

View full text Add to dashboard Cite

Here, we propose a metagrating structure for dual-and narrow-band optical filtering and sensing in the VIS-NIR regime, comprising two closely spaced, optically thin layers of asymmetric dielectric nanostrip arrays with equal periods but varying nanostrip widths. Based on the numerical simulations, we clarify that the dual-narrow band filtering characteristics in the transmission spectrum is mainly due to the intercoupled antiphase Fano resonance modes in the each nanoslits and guided mode resonance (GMR) bound to top middle and bottom of the a binary metagratings, respectively. The intercoupled antiphase Fano resonance modes suppress the transmission in a way that adjoining nanostrips in the unit cell act as the dipole resonance, efficiently trapping the leaky radiation and enhance reflectance, while GMR modes at neighbouring wavelengths suppress transmission and enhance reflection, so as to shape the near-zero dual-narrow stopband dips. It is important that asymmetry of the nanostrips helps to improve the quality factor of both resonance modes and thus to reduce the stopband width. The sensitivity for this gas sensor structure was estimated to be 58 and 71 nm/RIU, with a transmission bandwidth of 2 and 4 nm for both modes, respectively. These new findings pave the way for subtractive optical wave modulation techniques, multiband filtering, sensing, and detection.

show abstract

Double Fano resonance in a side-by-side gratings structure

Cited by 3 publications

References 50 publications

New coupling mechanism of titanium nitride nanosphere dimers at short separation distances

New coupling mechanism of titanium nitride nanosphere dimers at short separation distances

Electromagnetic theory of double Fano resonances in plasmonic nanostructures and metamaterials

Dual and narrow-band optical filtering and sensing enabled by asymmetric dielectric metagratings

Contact Info

Product

Resources

About