Abstract
We report a method to enhance the electric field intensity in a gold sub-microhole structure. The local electric field distribution was simulated using a finite-difference time-domain (FDTD) solution for the three-dimensional reversed trapezoidal hole structure with and without microspheres and analyzed the transmittance, reflectance and absorptance spectra. Among various sizes for one microsphere, the strongest local electric field occurred for a microsphere with a size of 1 μm. Furthermore, the local electric field intensity was increased when two and three microspheres of 1 μm in size were added.
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