ABSTRACT
Double Fano resonances in optical frequency are investigated in an artificial plasmonic molecule consisting of seven identical nanocrosses. These two Fano resonances are found to originate from different physical mechanisms. One is caused by the excitation of the inherent quadrupole dark mode supported by a single nanocross, and the other is attributed to the magnetic plasmon mode due to the generation of antiphase ring currents in adjacent fused tetramers. The two Fano resonances can either be tuned simultaneously or independently within a wide spectral range by adjusting the geometrical parameters of the nanocrosses. The excitation of the magnetic plasmon in a chain made of coupled nanoparticles allows for subwavelength guiding of optical energy with low radiative losses. The field decay length is as long as 2.608 µm, which is comparable to that of the magnetic plasmon waveguides and far surpasses the value achieved in electric plasmon counterparts. Because of the special shape of the nanocross, a Mach-Zehnder interferometer can be built to steer optical beams. These results show that the proposed plasmonic nanostructures have potential applications in biochemical sensing, narrow line-shape engineering and on-chip optical signal propagation in nanoscale integrated optics.
ABSTRACT
<p><b>OBJECTIVE</b>To explore clinical effects of Ilizarov technique at stage I for repairing tibial post-traumatic osteomyelitis with bone and skin defect.</p><p><b>METHODS</b>From June 2010 to December 2013,44 patients with tibial post-traumatic osteomyelitis with bone and skin defect were treated with Ilizarov technique at stage I . Among them, there were 35 males and 9 females aged from 18 to 70 years old with an average of 42.5 years old. Bone defect ranged from 4 to 16 cm, skin defect ranged from 3 cm x 4 cm to 5 cm x 16 cm. The operation was performed debridement thoroughly, removed inflammatory bone section, osteotomy invasively, install circular external fixator by Ilizarow technique; screw nut were rotated at 1 week after operation, and prolonged 0.5 to 1.0 mm everyday. Wound surface, new born callus and bone healing were observed to evaluate clinical effects.</p><p><b>RESULTS</b>All patients were followed up from 11 to 36 months with an average of 18.5 months. Bone defect after osteotomy was from 6 to 22 cm with an average of 11.5 cm; the time of wound healing time ranged from 21 to 79 d with an average of 38 d; bone defect healing time was from 8 to 15 months with an average of 12.5 months. All patients were cured, no recurrent infection, refracture and shorten of calf deformity were occurred.</p><p><b>CONCLUSION</b>Repairing tibial post-traumatic osteomyelitis with bone and skin defect by llizarov technique at stage I has advantages of less trauma, low inflammatory recurrence rate, could avoid multiple complex operation, and receive definite curative effect.</p>
