Abstract
Crystalline gold nanoprisms of sub-micrometric size sustain high order plasmon modes in the visible and near infrared range that open a new realm for plasmon modal design, integrated coplanar devices and logic gates. In this article, we explore the tailoring of the surface plasmon local density of states (SP-LDOS) by embedding a single defect, namely a small hole, carved in the platelet by focused ion beam (FIB). The change in the SP-LDOS of the hybrid structure is monitored by two-photon luminescence (TPL) microscopy. The dependency of the two-dimensional optical field intensity maps on the linear polarization of the tightly focused femtosecond laser beam reveals the conditions for which the hole defect significantly affects the initial modes. A detailed numerical analysis of the spectral characteristics of the SP-LDOS based on the Green dyadic method clearly indicates that the hole size and location can be exploited to tune or remove selected SP modes.
Highlights
The control of light transfer through subwavelength volumes still represents a major challenge in the downscaling of optical and electro-optical components for which nanoscale plasmonics concepts offer a most promising gateway[1,2,3,4,5]
We investigate a perturbative approach to rationally design the surface plasmon local density of states (SP-LDOS) that consists in the insertion of a small defect on the edge or inside the colloidal plasmonic resonator by drilling a single hole by focused ion beam (FIB)
The two–photon luminescence (TPL) signal emitted by the aperture is systematically more intense than the one of the nanoprism, the spatial distribution of which is only weakly affected by the milling
Summary
The control of light transfer through subwavelength volumes still represents a major challenge in the downscaling of optical and electro-optical components for which nanoscale plasmonics concepts offer a most promising gateway[1,2,3,4,5]. Numerical simulations of the TPL maps based on the Green Dyadic Method[9,15] account closely for the experimental results and provide a complementary analysis of the spectral modal distribution It reveals the different perturbation regimes and SP-LDOS reconstruction in the hybrid hole-nanoprism coupled system. Our FIB-based proof-of-principle is irreversible, yet Babinet’s principle suggests that it could be generalized to a reversible modulation of the SP-LDOS by replacing the hole milling method with the positioning of a complementary nanoparticle that would affect the SP mode distribution[14,17,18,19] These nanoparticles are essentially two dimensional (2D) with a thickness of 20 ± 2 nm but lateral dimensions ranging from 500 to 1000 nm. Apart from a numerical study of pierced prismatic system[31], the hole has been almost exclusively studied in extended evaporated films rather than micrometer-sized single crystalline platelets
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