Highly confined energy propagation in a gap waveguide composed of two coupled nanorod chains

Wang, F. M.; Liu, Hui; Li, T.; Wang, S. M.; Zhu, Shining; Zhu, Jie; Cao, Wenwu

doi:10.1063/1.2790786

Cited by 12 publications

(18 citation statements)

References 21 publications

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“…In addition, besides the confinement of the energy in the z direction, the energy can also be highly confined in the y direction. In this case the energy is confined in two dimensions of the gap waveguide, and the energy flow cross section of the transverse mode can be restricted to the y-z cross section of 70 × 145 nm 2 (λ/33 × λ/16) at the frequency of 130.0 THz, the attenuation length of the energy propagation can reach about 16.6 µm (7.2λ), and the propagating modes can exhibit a broad continuous frequency band from zero up to a cutoff frequency (162.6 THz) by means of tuning the size of the structures [213]. The gap waveguide has potential applications in biosensing and in-plane transmission of electromagnetic energy for subwavelength integrated optical devices owing to the high-intensity electric field in the gap of the nanorods.…”

Section: 1b Metal Nanorodsmentioning

confidence: 99%

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Nanostructures for surface plasmons

Zhang

2012

Adv. Opt. Photon.

113

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Surface plasmons (SPs) are electromagnetic excitations existing at the interface between a metal and a dielectric material. Control and manipulation of light based on SPs at the nanometer scale offers significant advantages in nanophotonic devices with very small elements, since the peculiar properties of SPs can be tailored by construction of nanostructures with various interfaces between metals and dielectric materials. Recent progress in nanostructures for SPs is reviewed. Resonance frequencies or wavelengths of SPs can be tuned by design of metal nanostructures, such as nanoparticles, nanorods, nanowires, nanosheets, and nanodisks. Moreover, SP resonance modes can also be tuned by control of the shapes and sizes of nanostructures, where the resonance modes include longitudinal and transversal resonances, dipolar and multipolar resonances, and Fano resonances. Based on SP coupling for metal nanostructures, metal-semiconductor nanostructures, metal-dielectric nanostructures, and metal-polymer nanostructures, propagating and guiding of SP can be achieved through the metal nanostructures and the hybrid structures. Additionally, metal nanostructures exhibit remarkable field enhancement effects (e.g., local near-field enhancement, and optical transmission enhancement) due to SP coupling. Furthermore, SP nanostructures perform unique focusing and imaging characteristics at the nanometer scale beyond the diffraction limit. Tailoring SPs by control of the nanostructures is expected to be used for design and development of high-performance optical components and circuits, which offer both potential and challenges for new generations of nanophotonic devices.

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Section: 1b Metal Nanorodsmentioning

confidence: 99%

“…Zhu and co-workers proposed that a type of subwavelength gap waveguide could be used to transport energy in a broad frequency band based on a finite difference time domain (FDTD) calculation [213]. The gap waveguide is composed of two coupled nanorod chains.…”

Section: 1b Metal Nanorodsmentioning

confidence: 99%

Nanostructures for surface plasmons

Zhang

2012

Adv. Opt. Photon.

113

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“…Recently, a number of plasmonic waveguides for on-chip electromagnetic (EM) energy transportation have been proposed, including metal nanoparticles [1][2][3][4], metal nanorods [5][6][7][8][9][10][11][12][13][14], and single split ring resonators (SSRRs)-based waveguide [15]. It is noticed, however, that the nanoparticlesbased waveguide exhibits huge energy attenuation coefficient and can only transport EM energy within a narrow frequency range surrounding the center frequency, which limits its practical application.…”

Section: Introductionmentioning

confidence: 98%

“…It is noticed, however, that the nanoparticlesbased waveguide exhibits huge energy attenuation coefficient and can only transport EM energy within a narrow frequency range surrounding the center frequency, which limits its practical application. Nanorods-based waveguide, on the other hand, may feature a broadened bandwidth for the introduction of an additional interaction mechanism-namely, the flow of displacement current [5,16]. Nevertheless, a large number of nanorod pairs are needed to achieve a satisfying range of bandwidth (typically 50 pairs of nanorods can only provide a bandwidth of less than 30 THz [5]), which is unsuitable for large-scale photonic integration.…”

Section: Introductionmentioning

confidence: 99%

Energy transportation in a subwavelength waveguide composed of a pair of comb-shape nanorod chains

et al. 2012

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A subwavelength plasmonic waveguide composed of a pair of comb-shape nanorod chains is proposed. The electromagnetic energy can be transported in the waveguide via the interaction strength of magnetoinductive coupling as well as conduction current exchange. Finite Element Method simulation results reveal that for such a waveguide composed of 50 pairs of 400 nm-long-nanorods, a passband ranging from zero to cutoff frequency 156.2 THz, and an effective propagation length of 20.87 μm can be achieved simultaneously. The proposed mechanism of energy transport in the nanoscale has potential applications in subwavelength transmission lines for a wide range of integrated optical devices.

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“…The magnetic resonance of SRRs can produce negative permeability, 10 and a combination of SRR and thin metallic wires successfully produces a negative refractive index material. 11 Many other structures have also been introduced to realize magnetic resonance in a high-frequency regime, such as fish-net, [12][13][14][15] nanorod pairs 16 and nanosandwich. [17][18][19] In general, the incident light field can induce a magnetic-dipole and an MR can be viewed as the classical analogue of magnetic-dipole moments connected with quantum-mechanical orbital angular momentum.…”

Section: Introductionmentioning

confidence: 99%

Interaction of magnetic resonators studied by the magnetic field enhancement

Hou

2013

AIP Advances

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It is the first time that the magnetic field enhancement (MFE) is used to study the interaction of magnetic resonators (MRs), which is more sensitive than previous parameters–shift and damping of resonance frequency. To avoid the coherence of lattice and the effect of Bloch wave, the interaction is simulated between two MRs with same primary phase when the distance is changed in the range of several resonance wavelengths, which is also compared with periodic structure. The calculated MFE oscillating and decaying with distance with the period equal to resonance wavelength directly shows the retardation effect. Simulation also shows that the interaction at normal incidence is sensitive to the phase correlation which is related with retardation effect and is ultra-long-distance interaction when the two MRs are strongly localized. When the distance is very short, the amplitude of magnetic resonance is oppressed by the strong interaction and thus the MFE can be much lower than that of single MR. This study provides the design rules of metamaterials for engineering resonant properties of MRs.

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Highly confined energy propagation in a gap waveguide composed of two coupled nanorod chains

Cited by 12 publications

References 21 publications

Nanostructures for surface plasmons

Nanostructures for surface plasmons

Energy transportation in a subwavelength waveguide composed of a pair of comb-shape nanorod chains

Interaction of magnetic resonators studied by the magnetic field enhancement

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