All-optical control of surface plasmons by second-harmonic generation

作     者：Sergio G. Rodrigo 

作者机构：Instituto de Ciencia de Materiales de Aragón Departamento de Física de la Materia Condensada CSIC Universidad de Zaragoza Zaragoza E-50009 Spain Centro Universitario de la Defensa Carretera de Huesca s/n Zaragoza E-50090 Spain 

出 版 物：《Physical Review B》 (Phys. Rev. B)

年 卷 期：2018年第98卷第4期

页      面：041407(R)-041407(R)页

核心收录：

基　　金：Ministerio de Ciencia, Innovación y Universidades, MCIU, (MAT2017-88358-C3-2-R) Ministerio de Ciencia, Innovación y Universidades, MCIU European Regional Development Fund, FEDER Agencia Estatal de Investigación, AEI 

主　　题：Nanophotonics Surface plasmon polariton Finite-difference time-domain method Optical second-harmonic generation 

摘      要：All-optical control of surface plasmon polaritons (SPPs) is theoretically demonstrated in arrays of metallic slits. It is shown how the mixing of electromagnetic fields scattered by the slits from a weak beam at λ wavelength, with second-harmonic fields generated by a high-intensity 2λ beam, creates a destructive interference of surface plasmons in one of the two possible directions of emission from the slits, while these are enhanced along the opposite direction. Our method enables spectrally broadband excitation and thus unidirectional launching of SPP pulses as short as ∼20 fs, all-optically controlled. Based on these findings, an ultranarrow bandwidth surface plasmon frequency comb is designed.