A one-dimensional magnetic plasmon propagating in a linear chain of single split ring resonators is proposed. The subwavelength size resonators interact mainly through exchange of conduction current, resulting in stronger coupling as compared to the corresponding magneto-inductive interaction. Finite-difference time-domain simulations in conjunction with a developed analytical theory show that efficient energy transfer with signal attenuation of less then 0.57 dB/microm and group velocity higher than 1/4c can be achieved. The proposed novel mechanism of energy transport in the nanoscale has potential applications in subwavelength transmission lines for a wide range of integrated optical devices.
We present calculations of the optical force on heterodimer of two gold nanorods aligned head-to-tail, under plane wave illumination that is polarized along the dimer axis. It is found that near the dipole-quadrupole Fano resonance, the optical binding force between the nanorods reverses, indicating an attractive to repulsive transition. This is in contrast to homodimer which in similar configuration shows no negative binding force. Moreover, the force spectrum features asymmetric line shape and shifts accordingly when the Fano resonance is tuned by varying the nanorods length or their gap. We show that the force reversal is associated with the strong phase variation between the hybridized dipole and quadrupole modes near the Fano dip. The numerical results may be demonstrated by a near-field optical tweezer and shall be useful for studying "optical matters" in plasmonics.
Magnetic metamaterials consist of magnetic resonators smaller in size than
their excitation wavelengths. Their unique electromagnetic properties were
characterized by the effective media theory at the early stage. However, the
effective media model does not take into account the interactions between
magnetic elements; thus, the effective properties of bulk metamaterials are the
result of the "averaged effect" of many uncoupled resonators. In recent years,
it has been shown that the interaction between magnetic resonators could lead
to some novel phenomena and interesting applications that do not exist in
conventional uncoupled metamaterials. In this paper, we will give a review of
recent developments in magnetic plasmonics arising from the coupling effect in
metamaterials. For the system composed of several identical magnetic
resonators, the coupling between these units produces multiple discrete
resonance modes due to hybridization. In the case of a system comprising an
infinite number of magnetic elements, these multiple discrete resonances can be
extended to form a continuous frequency band by strong coupling. This kind of
broadband and tunable magnetic metamaterial may have interesting applications.
Many novel metamaterials and nanophotonic devices could be developed from
coupled resonator systems in the future.Comment: 10 papges, 10 figures, It is a review paper about coupled magnetic
metamaterial
We demonstrate a high-power red-green-blue laser source based on the quasi-phase-matching and intermittent oscillating dual-wavelength laser technique. A cascaded LiTaO3 superlattice was used to achieve the generation of red light at 660 nm, green light at 532 nm, and blue light at 440 nm to obtain the output of red-green-blue laser light from a diode-side-pumped Q-switched intermittent oscillating dual-wavelength Nd:YAG laser. The average output power of red-green-blue of 1.01 W was achieved under the total fundamental power of 5.1 W, which corresponds to the conversion efficiency of 20%.
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