In a previous study, we have discovered that nonlinear processes can beenhanced several orders of magnitude due to the path interference effects whichare introduced by Fano resonances. Emergence of this phenomenon has beendemonstrated also in 3-dimensional solutions of Maxwell equations. However,enhancement has been found to be limited by the decay rate of the plasmonicoscillations. In the present work, we demonstrate that such a limitation can belifted o? when the path interference from two quantum emitters to a plasmonicresonator (second harmonic converter) is considered. Enhancement factors muchlarger than 7 orders of magnitude are possible using such an interferencescheme. Therefore, a single hybridized system of 3 particles (manufacturedcarefully) can account for almost all of the second harmonic generatedradiation emitted from a sample of plasmonic particle clusters decorated withquantum emitters (e.g. a spaser).
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