Abstract
A method for the analysis of finding the conversion efficiency of the surface plasmon polariton in slit-groove structures is proposed and studied. The conversion efficiency of the surface plasmon polariton can be determined by measuring the intensities of light scattered at the slit and groove positions. To verify the usefulness of the proposed method, two rigorous simulations based on the finite-difference time-domain method were executed and the simulation results compared with previously reported data. One was to mimic the far-field imaging experiment in slit-groove structure and the other was to calculate the conversion coefficient directly in a single scattering structure. The SPP conversion efficiencies obtained from the two simulations were approximately 0.232 and 0.220 respectively, and these agreed with the reported data. The suggested method can be used regardless of the shape of the plasmon-generation structure; therefore, it is expected to be useful in a wide range of experiments with different scattering structures.
Highlights
Since the discovery of surface plasmon polaritons (SPPs), researchers have paid significant attention to them because they enable sub-wavelength focusing and filed enhancement in nanophotonics [1, 2], as well as their potential applications to light emission control and plasmonic integrated circuits [3, 4]
The metal for the SPPs was deposited on the substrate, and it is assumed that the metal film is thick enough to not transmit the incident light
When the conversion coefficient of SPPs by the edge structure is denoted as Cs, the SPP-converted intensity of incident light at the top surface of the substrate can be written as 2CsγI0 owing to two edge structures
Summary
Since the discovery of surface plasmon polaritons (SPPs), researchers have paid significant attention to them because they enable sub-wavelength focusing and filed enhancement in nanophotonics [1, 2], as well as their potential applications to light emission control and plasmonic integrated circuits [3, 4]. SPPs are promising candidates for integrated photonic circuits in sub-micrometer scale because they can be confined and propagate in the sub-wavelength scale [5] They have great potential to bridge electronics and photonics that face the difficulty in integrating photonic circuits with electronic chips because of the size mismatch problem [6]. To launch SPPs on planar chips, a structure providing momentum transfer is essential because of the mismatch of the dispersion curve between light and SPPs. Momentum delivery can be realized either by evanescent coupling via total internal reflection (Kretschmann geometry) or coupling into a thin narrow slit [7]. Momentum delivery can be realized either by evanescent coupling via total internal reflection (Kretschmann geometry) or coupling into a thin narrow slit [7] Among these, the latter is easy to fabricate on planar metal surfaces and efficient for SPP creation. One was to mimic a real experiment of a far-field imaging experiment, which can be called a virtual experiment, and the other was a direct calculation of the SPP conversion efficiency in a single-slit structure
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