Abstract
To isolate the focused near-field excitation at the probe apex from the contribution of the far-field illumination, a novel metallic probe which consisted of a taper cylinder tip and a couple of curved nanoslits on the probe base was designed. The local field enhancement and confinement performance varying with the structure parameters of the probe and the type of substrates were investigated by means of finite-difference time-domain simulation. With the optimized probe working in probe-substrate coupling mode, the local electric field intensity at the probe apex can be effectively enhanced by more than 500 times compared to the incident field.
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