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Quantum coherence-assisted propagation of surface plasmon polaritons
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Image of FIG. 1.
FIG. 1.

Schematic of the quantum coherence-assisted propagation of surface plasmon polariton on a metallic surface adjacent to quantum coherence (phaseonium) medium composed of three-level emitters (semiconductor quantum dots, atoms, rare-earth ions, molecules, etc.) embedded in a dielectric host. The gain medium is incoherently pumped (optical or electrical) at a rate g to the upper level which can decay to levels and . We select the three-level emitter such that the transition is resonantly coupled (near-field dipole-coupling) to the plasmon mode of the metal surface and the emission from this transition is efficiently transferred to SPPs.

Image of FIG. 2.
FIG. 2.

Plot of Im kx as a function of the incoherent pumping rate g for different driving fields: (solid red), (dashed-dotted green), and (dashed blue). The dotted circles correspond to lossless propagation. Here (a) and (b) are for telecommunication (at 1550 nm) while(c),(d) correspond to visible (at 653 nm) wavelengths excitation of theSPP. We have modeled the gain medium using the following realistic parameters: , Cm, and . The dephasing of coherence is while for the other transitions we considered . The solid circles in (b) correspond to the threshold value gth for gain. Coherent drive induces higher gain which assists reducing the threshold pump for gain (shown by solid circles in (b)) and lowers the critical pump required for lossless propagation (shown by the dotted circles in (a) and (c)).

Image of FIG. 3.
FIG. 3.

Plot of the propagation length Lx of the SPP excited at visible wavelength (at 653 nm) as a function coherent drive Rabi frequency for three different values of (solid red), (dashed green), 5.7 (dashed-dotted blue), respectively. All other parameters are same as Fig. 2 . Coherent drive enhances the propagation length substantially for optimum value of .


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Quantum coherence-assisted propagation of surface plasmon polaritons