Temporal and spatial control of femtosecond surface plasmon polariton wavepackets by eigenmode resonance of metal-insulator-metal nano-cavities

Naoki Ichiji; Atsushi Kubo

doi:10.1117/12.2594424

1 August 2021 Temporal and spatial control of femtosecond surface plasmon polariton wavepackets by eigenmode resonance of metal-insulator-metal nano-cavities

Naoki Ichiji, Atsushi Kubo

Author Affiliations +

Proceedings Volume 11797, Plasmonics: Design, Materials, Fabrication, Characterization, and Applications XIX; 1179723 (2021) https://doi.org/10.1117/12.2594424
Event: SPIE Nanoscience + Engineering, 2021, San Diego, California, United States

Conference Poster

Abstract

We investigate spatial control of femtosecond surface plasmon polariton wave packets (SPP WPs) induced by a nanoscaled metal-insulator-metal structure by using time-resolved two-photon excitation microscopy and numerical calculations. Irradiations of 10 fs laser pulses to a ridge structure placed on a Au film launch SPP WPs that propagate on the surface to interact with a MIM nano-cavity. When the SPP WP reaches the MIM nano-cavity, the field intensity of the WP of which frequency coincides with the cavity resonance is enhanced in the MIM structure, and then transmits the cavity to continue the propagation. The time-resolved micrographs reveal deformations of the spatial shape of WPs after passing through the cavity. Because the SPP WP possesses a down-chirped spatial frequency while propagating on the Au surface, the spectral modulation of the WP owing to the cavity transmission is reflected as a spatial deformation of the envelope shape. When the cavity transmits low (high)-frequency components, the peak position of the transmitted WPs shows an advance (delay) sift compared to a reference WP propagated on the plane surface. The numerical model based on complex dispersion relations of the SPP reasonably reproduced the deformation of the SPP WP.

Citation Download Citation

Naoki Ichiji and Atsushi Kubo "Temporal and spatial control of femtosecond surface plasmon polariton wavepackets by eigenmode resonance of metal-insulator-metal nano-cavities", Proc. SPIE 11797, Plasmonics: Design, Materials, Fabrication, Characterization, and Applications XIX, 1179723 (1 August 2021); https://doi.org/10.1117/12.2594424

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