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Silencing and enhancement of second-harmonic generation in optical gap antennas

Abstract : Amplifying local electromagnetic fields by engineering optical interactions between individual constituents of an optical antenna is considered fundamental for efficient nonlinear wavelength conversion in nanometer-scale devices. In contrast to this general statement we show that high field enhancement does not necessarily lead to an optimized nonlinear activity. In particular, we demonstrate that second-harmonic responses generated at strongly interacting optical gap antennas can be significantly suppressed. Numerical simulations are confirming silencing of second-harmonic in these coupled systems despite the existence of local field amplification. We then propose a simple approach to restore and amplify the second-harmonic signal by changing the manner in which electrically-connected optical antennas are interacting in the charge-transfer plasmon regime. Our observations provide critical design rules for realizing optimal structures that are essential for a broad variety of nonlinear surface-enhanced characterizations and for realizing the next generation of electrically-driven optical antennas.
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Contributor : Gérard Colas Des Francs Connect in order to contact the contributor
Submitted on : Saturday, June 2, 2012 - 8:40:02 PM
Last modification on : Wednesday, March 9, 2022 - 3:03:07 PM

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Johann Berthelot, Guillaume Bachelier, Mingxia Song, Padmnabh Rai, Gérard Colas Des Francs, et al.. Silencing and enhancement of second-harmonic generation in optical gap antennas. Optics Express, 2012, 20 (10), pp.10498-10508. ⟨10.1364/OE.20.010498⟩. ⟨hal-00703536⟩



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