Abstract
Experiments and numerical simulations demonstrate that when a silver nanowire is placed on a dielectric multilayer, but not the commonly used bare glass slide, the effective refractive index of the propagating surface plasmons along the silver nanowire can be controlled. Furthermore, by increasing the thickness of the top dielectric layer, longer wavelength light can also propagate along a very thin silver nanowire. In the experiment, the diameter of the silver nanowire can be as thin as 70 nm, with the incident wavelength as long as 640 nm. The principle of this control is analysed from the existence of a photonic band gap and the Bloch surface wave with this dielectric multilayer substrate.
Highlights
During the last decade, there has been a continuous effort toward the development of plasmonic devices
Simulation show that the results show that the effective refractive index (β/k mode is decreased with decreasing effective refractive index (β/k0) of the H1X mode is decreased with decreasing top layer thickness, top layer is consistent with from the results derived from the BFP2a–c
Mode on a very thin Ag NW, when placed on a dielectric multilayer. Both mode on a very thin Ag NW, when placed on a dielectric multilayer. Both the the effective refractive index and propagation distance or cutoff wavelength of this mode can be effective refractive index and propagation distance or cutoff wavelength of this mode can be tuned with tuned with the thickness of the top dielectric (SiO2) layer
Summary
There has been a continuous effort toward the development of plasmonic devices. One reason is surface plasmon polaritons (SPPs)—originating from the coupling of an electromagnetic wave to the free electrons of a metal—can strongly confine electromagnetic fields to overcome the optical diffraction limit of dielectric optics, and be very sensitive to the surrounding medium [1,2]. Plasmonic devices are promising to build dense on-chip integrated circuits for next-generation information technology and high-performance nanoscale sensors [3,4,5,6]. SPP waveguides are one of the key elements. A triangular groove milled on a metal surface can work as the channel plasmon subwavelength waveguide [7,8]
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