Abstract
We present a detailed experimental and theoretical study of plasmon Talbot effect. A theoretical model based on simple scattering theory is developed to describe the Talbot self-imaging pattern generated by a linear arrangement of cylindrical nanostructures forming a periodic array. We first show the experimental observation of plasmon Talbot carpets created by propagating surface plasmon polaritons (SPP) interacting with cylindrical nanostructures positioned on a thin Au film using leakage radiation microscopy. Such images provide information on the distribution of the plasmon intensity close to the nanostructures. Next, heterodyne interferometer based near-field imaging is carried out to extract information on the plasmonic modes forming the Talbot carpet deployment. We report the experimental observation of Talbot focal spots with dimensions down to lambda/4.
Highlights
In recent years the study and manipulation of subwavelength optical fields is attracting great interest owing to the potential applications in biophotonics, ultrafast communication and quantum optics
We present a detailed experimental and theoretical study of plasmon Talbot effect
A theoretical model based on simple scattering theory is developed to describe the Talbot self-imaging pattern generated by a linear arrangement of cylindrical nanostructures forming a periodic array
Summary
In recent years the study and manipulation of subwavelength optical fields is attracting great interest owing to the potential applications in biophotonics, ultrafast communication and quantum optics. The scattering of SPP with periodically patterned defects is of particular interest as it invokes several interesting phenomena that are analogous to those found in conventional optics One such effect is the revival or self-imaging of the field after transmission or reflection from a periodic structure, called Talbot effect [12]. Dennis et al has shown theoretically that it is possible to create complex plasmon carpets containing hot spots by a row of periodically spaced surface defects on a metal surface [18]. Their system consisted of a row of holes drilled in Ag film, illuminated from the backside. The subwavelength resolution of the near-field microscopic images enables us to measure the spatial confinement of individual Talbot hot-spots
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