Method for enhancing a sum frequency generation signal
(2013)
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- Abstract
- The present invention is related to a method for spatially selecting an enhanced sum frequency generation signal comprising the steps of: - providing an adsorption substrate com prising a flat surface and metallic nanorods fixed onto the flat surface, said nanorods having an aspect ratio higher th an 1, preferably higher than 1,2 and exhibiting longitudinal and transverse plasmon modes, the excitation frequency of the longitudinal and transverse plasmon modes being different; - adsorbing molecules of interest at the surface of the adsorption substrate; - illuminating said adsorption substrate with a first and a second coherent light source which overlap on said adsorption substrate; - measuring the sum frequency light generated from the interaction between the first and the second coherent light source at the interface between the substrate and the adsorbed material, wherein the frequency of the first light source or the sum of the frequency of the first light source with the frequency of the second light source corresponds to the resonance frequency of either the transverse or the longitudinal surface plasmon mode of the nanorods, thereby selecting the signal arising from either the sidewalls of the nanorods or the end surfaces of the nanorods.
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Citations
Lis, D., Cecchet, F., Caudano, Y., Demoustier, S., Henry, M., Ferain, E., & Joris, B. (2013). Method for enhancing a sum frequency generation signal (Patent No. WO2013160376). https://hdl.handle.net/2078.5/255426