Development of high-throughput, polarization-maintaining, near-field probes

Applied Optics
Vivekananda P AdigaH Dennis Drew

Abstract

A novel, chemical-etching technique produces very high throughput, polarization-maintaining probes for near-field, scanning, optical microscopy (NSOM). The process includes coating the tips with aluminum and forming the apertures with a focused ion beam (FIB). The elliptical core fibers used resulted in elliptical apertures for the probes. The throughput of the probes depends on the incident polarization. For polarization parallel to the minor axis, the tip presents an insertion loss of only 20 dB for aperture widths of 55 nm. Probes have a typical polarization extinction of 100 to 1 in the far field. These tips produced NSOM images of gold dots on a GaAs substrate in reflection mode.

References

Jun 8, 2004·Journal of Electron Microscopy·Tadashi Mitsui, Takashi Sekiguchi
Jun 14, 2004·Optics Express·A ZakharianJ Moloney
Aug 1, 1992·Applied Optics·E BetzigR Wolfe

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