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Extraordinary optical transmission in nano-bridged plasmonic arrays mimicking a stable weakly-connected percolation threshold. | LitMetric

AI Article Synopsis

  • Ultrasensitive sensors can be created using percolation systems, where an insulating material is filled with nearly touching conductive particles, resulting in significant changes in response when a stimulus is applied.
  • At the percolation threshold, these systems exhibit instability; however, stability can be maintained by creating weak connections between the conducting particles.
  • The research uses nano-bridged lithography to develop a percolation system with coupled arrays, demonstrating that it leads to extraordinary optical transmission and makes the system suitable for future sensor applications.

Article Abstract

Ultrasensitive sensors of various physical properties can be based on percolation systems, e.g., insulating media filled with nearly touching conducting particles. Such a system at its percolation threshold featuring the critical particle concentration, changes drastically its response (electrical conduction, light transmission, etc.) when subjected to an external stimulus. Due to the critical nature of this threshold, a given state at the threshold is typically very unstable. However, stability can be restored without significantly sacrificing the structure sensitivity by forming weak connections between the conducting particles. In this work, we employed nano-bridged nanosphere lithography to produce such a weakly connected percolation system. It consists of two coupled quasi-Babinet complementary arrays, one with weakly connected, and the other with disconnected metallic islands. We demonstrate via experiment and simulation that the physics of this plasmonic system is non-trivial, and leads to the extraordinary optical transmission at narrowly defined peaks sensitive to system parameters, with surface plasmons mediating this process. Thus, our system is a potential candidate for percolation effect based sensor applications. Promising detection schemes could be based on these effects.

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Source
http://dx.doi.org/10.1364/OE.403034DOI Listing

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