Abstract
We design nanogratings consisting of concentric plasmonic resonance grooves on the metallic sidewalls of near-field scanning probe aperture to increase the power throughput without losing the imaging resolution. Nanograting tip design involves choosing the proper pitch length and the cut location of grooves. Four different nanograting designs are evaluated, as compared with standard single aperture pyramidal near-field scanning probe without grating patterns. We show that, by adding nano-grooves at the location of electromagnetic field intensity-maximum along interface and with the pitch period matching the surface plasmon wavelength, the power throughput can be greatly increased by at least a factor of 530 at 405nm UV wavelength with 100nm diameter aperture probe.
Highlights
Modulating metal surface is often used to support surface plasmonic polaritons (SPP) and enhance local focusing beyond the diffraction limit [1]
We propose a novel approach of designing nanograting on NSOM aperture probe
The results show that grating pitch should matches plasmon polarity phase change along probe metal/exit medium interface, instead of the metal/inner dielectric interface
Summary
Modulating metal surface is often used to support surface plasmonic polaritons (SPP) and enhance local focusing beyond the diffraction limit [1]. A proper nanograting design involves choosing the pitch length and its “cut location” (the distance from the center of groove to the apex), which are determined by many factors, including the tip geometric dimensions, material parameters, the operating wavelength and the electromagnetic field distribution. We optimized the nanogratings on cantilever-based pyramidal aperture probe [16,22], whose structure is shown, through a comparative study of four grating designs with various pitch lengths and cut locations. Simulation shows that by properly choosing the pitch length and cut location, one can increase the power throughput of near-field scanning probe by a factor of 530 at UV wavelength as compared with a standard single aperture probe with the same aperture diameter of 100nm, while retaining the same scanning resolution. The numerical simulation results are presented and discussed, with emphases on how to choose the proper parameters for optimized power throughput enhancement
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