3D-FDTD and experimental analysis of a resonant microcavity probe for high-resolution SNOM

Yasushi Oshikane; Hirofumi Nakagawa; Toshihiko Kataoka; Katsuyoshi Endo; Haruyuki Inoue; Takayuki Hirai

doi:10.1117/12.363862

22 September 1999 3D-FDTD and experimental analysis of a resonant microcavity probe for high-resolution SNOM

Yasushi Oshikane, Hirofumi Nakagawa, Toshihiko Kataoka, Katsuyoshi Endo, Haruyuki Inoue, Takayuki Hirai

Proceedings Volume 3791, Near-Field Optics: Physics, Devices, and Information Processing; (1999) https://doi.org/10.1117/12.363862
Event: SPIE's International Symposium on Optical Science, Engineering, and Instrumentation, 1999, Denver, CO, United States

Abstract

A simple novel probe for Scanning Near-field Optical Microscope (SNOM) is proposed. The probe consists of a small protrusion on a micro resonator. The resonator and protrusion is a spherical micro sphere with diameter of 50-70 μm, 1.5 μm, respectively. The resonator is a polystyrene latex sphere and the protrusion is a polymethyl methacrylate sphere. The s-polarized laser (Ti:Sapphire laser) beam, which illuminates the resonator through an evanescent wave, can be tuned to the resonant frequencies. The resonance occurred in the sphere is a traveling wave resonance, which is called MDRs (Morphology Dependent Resonances) or WGMs (Whispering Gallery Modes). The internal resonant wave could generate an intensive evanescent field on the surface of the resonator. The small protrusion on the resonator combines with the evanescent field and could acts as a high sensitive probe for SNOM. A clear image of the protrusion illuminated by the evanescent field on the resonator was observed with the cooled CCD detector. The brightness of the image of the protrusion depends on the laser wavelength. The optical characteristics of the resonant probe is also studied by a Finite-Difference Time- Domain method.

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Yasushi Oshikane, Hirofumi Nakagawa, Toshihiko Kataoka, Katsuyoshi Endo, Haruyuki Inoue, and Takayuki Hirai "3D-FDTD and experimental analysis of a resonant microcavity probe for high-resolution SNOM", Proc. SPIE 3791, Near-Field Optics: Physics, Devices, and Information Processing, (22 September 1999); https://doi.org/10.1117/12.363862

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KEYWORDS

Optical spheres

Near field scanning optical microscopy

Optical microcavities

Glasses

Resonators

Latex

Refractive index

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