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Báo cáo hóa học: " Unusual magneto-optical behavior induced by local dielectric variations under localized surface plasmon excitations"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Unusual magneto-optical behavior induced by local dielectric variations under localized surface plasmon excitations | González-Díaz et al. Nanoscale Research Letters 2011 6 408 http www.nanoscalereslett.eom content 6 1 408 o Nanoscale Research Letters a SpringerOpen Journal NANO EXPRESS Open Access Unusual magneto-optical behavior induced by local dielectric variations under localized surface plasmon excitations Juan B González-Díaz Antonio García-Martínt and Gaspar Armelles Reig Abstract We study the effect of global and local dielectric variations on the polarization conversion rps response of ordered nickel nanowires embedded in an alumina matrix. When considering local changes we observe a non-monotonous behavior of the rps its intensity unusually modified far beyond to what it is expected for a monotonous change of the whole refractive index of the embedding medium. This is related to the local redistribution of the electromagnetic field when a localized surface plasmon is excited. This finding may be employed to develop and improve new biosensing magnetoplasmonic devices. During the last years a great effort has been devoted to the study of metallic nanoparticles due to their distinct optical properties with respect to that of the bulk material 1 . These differences arise mainly from their ability to uphold charge density oscillations known as localized surface plasmons LSPs . These spatially localized modes may appear at a metal dielectric interface manifesting themselves as optical resonances in the transmission and reflection spectra being their most significant feature the local enhancement of the electromagnetic EM field at the metal dielectric interface 2 . The spectral position width and intensity of the optical resonances are extremely dependent on the size shape particle inter-distance embedding environment or material components of the nanoparticles. In a number of works the influence of such parameters has been thoroughly studied putting forward the possibility of tailoring their optical response through the morphology of the particles 3-6 . More recently the .