Interplay between out-of-plane magnetic plasmon and lattice resonance for modified resonance lineshape and near-field enhancement in double nanoparticles array

Ding, Pei; Wang, Junqiao; He, Jian‐Jun; Chen, Fan; Cai, Guo‐Ping; Liang, Erjun

doi:10.1088/1674-1056/22/12/127802

Cited by 2 publications

(1 citation statement)

References 37 publications

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“…The Fano resonance has been experimentally observed in gold nanorods structure supported on a substrate with very high dielectric constant 19 . Furthermore, the Fano resonance in metal nanostructures can also be obtained in a variety of arrays 20 – 22 or grating structures 23 . This is mainly due to the interaction between narrow diffraction resonance and wide plasmonic excitation modes.…”

Section: Introductionmentioning

confidence: 99%

An engineered CARS substrate with giant field enhancement in crisscross dimer nanostructure

Zhang

Chen

Wang

et al. 2018

Sci Rep

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We theoretically investigate the optical properties of a nanostructure consisting of the two identical and symmetrically arranged crisscrosses. A plasmonic Fano resonance is induced by a strong interplay between bright mode and dark modes, where the bright mode is due to electric dipole resonance while dark modes originate from the magnetic dipole induced by LC resonances. In this article, we find that the electric field “hotspots” corresponding to three different wavelengths can be positioned at the same spatial position, and its spectral tunability is achieved by changing geometric parameters. The crisscrosses system can be designed as a plasmonic substrate for enhancing Coherent Anti-Stokes Raman Scattering (CARS) signal. This discovery provides a new method to achieve single molecule detection. At the same time, it also has many important applications for multi-photon imaging and other nonlinear optical processes, such as four-wave mixing and stimulated Raman scattering.

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Section: Introductionmentioning

confidence: 99%

An engineered CARS substrate with giant field enhancement in crisscross dimer nanostructure

Zhang

Chen

Wang

et al. 2018

Sci Rep

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Extinction properties of gold nanorod complexes

Yun-Huan¹,

Li²

2015

Acta Phys. Sin.

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Plasmonics with subwavelength characteristics can break the diffraction limit of light and be used to produce the sub-wavelength optoelectronic device, thus it has aroused great interest for decades. Local surface plasmon resonance of metal nanoparticles has become one of the research hotspots due to the fact it can produce extinction and near-field enhancement effect. How to achieve controllable plasmon line shape and generate strong electromagnetic field enhancement is of great significance for improving the sensing performance, nonlinear effect and surface enhanced Raman factor of metallic nanostructures. The optical properties of plasmonic oligomer clusters composed of normal and L-shaped nanrod dimers are investigated by using the finite-difference time-domain method in this paper. There are two energy modes for an L-shaped nanorod due to its shaped anisotropy, where plasmons oscillate along the arms of the L-shaped nanorod or oscillate over the whole length of the L-shaped nanorod. Therefore, two bonding resonances appear in the spectrum of an L-shaped nanorod dimer, while only one bonding resonance exists for normal nanorod dimer. When a normal nanorod dimer and an L-shaped nanorod dimer are aligned together to form a quadrumer, the three bonding resonances can be excited simultaneously and radiative damping can be suppressed effectively around the dip spectral positions. It is shown that the optical responses of quadrumer can be strongly tuned by manipulating the geometry parameters. For example, the coupling between the two dimers can be modified by adjusting the separation, and the three resonances shift toward higher energies with the increasing of the separation. In addition, the optical responses of individual nanorod depend on the corresponding arm length. As a result, the three resonances of the quadrumer can also be well tuned by adjusting the arm length. Comparing the variation of resonance peak positions between L-shaped nanorod dimer and normal nanorod dimer, we can more intuitively understand spectral lineshape variation of quadrumer. These results can be used for guiding the design of nano-photonic devices for plasmonic oligomer clusters and also for developing the application of surface-enhanced Raman scattering and biological sensing.

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Interplay between out-of-plane magnetic plasmon and lattice resonance for modified resonance lineshape and near-field enhancement in double nanoparticles array

Cited by 2 publications

References 37 publications

An engineered CARS substrate with giant field enhancement in crisscross dimer nanostructure

An engineered CARS substrate with giant field enhancement in crisscross dimer nanostructure

Extinction properties of gold nanorod complexes

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