Plasmon-induced enhancement of nonlinear optical processes in a double-resonant metallic nanostructure grating

Journal Article (2020)
Author(s)

M.L. Noordam (TU Delft - QN/Kuipers Lab)

F.J. Hernandez Rueda (TU Delft - QN/Kuipers Lab)

L. Y. Talsma (Student TU Delft)

Kobus Kuipers (TU Delft - QN/Quantum Nanoscience)

Research Group
QN/Kuipers Lab
Copyright
© 2020 M.L. Noordam, F.J. Hernandez Rueda, L. Y. Talsma, L. Kuipers
DOI related publication
https://doi.org/10.1063/1.5141408
More Info
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Publication Year
2020
Language
English
Copyright
© 2020 M.L. Noordam, F.J. Hernandez Rueda, L. Y. Talsma, L. Kuipers
Research Group
QN/Kuipers Lab
Issue number
10
Volume number
116
Reuse Rights

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Abstract

Nanostructured gratings in a metal surface can highly enhance nonlinear optical processes. The geometrical parameters that characterize a grating can be optimized to achieve intense near-fields, which in turn enhance the nonlinear optical signals. For a nonlinear process that involves multiple frequencies, like four-wave mixing (FWM), the optimization of grating parameters necessary to enhance the radiation in-coupling for both frequencies is not trivial. Here, we propose, compute, and experimentally demonstrate a grating design that is resonant to two excitation frequencies and thus enhances the frequency mixing processes more efficiently. Second- and third-order nonlinear mechanisms are studied using two spatially and temporally overlapped laser pulses with different frequencies. Using our grating design, we achieve an unprecedented nonlinear FWM enhancement factor of 7 × 10 3.

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