Analysis of mode coupling due to spherical defects in ideal fully metal-coated scanning near-field optical microscopy probes

Journal of the Optical Society of America. A, Optics, Image Science, and Vision
Wataru NakagawaHans Peter Herzig

Abstract

We investigate the effect of defects in the metal-coating layer of a scanning near-field optical microscopy (SNOM) probe on the coupling of polarization modes using rigorous electromagnetic modeling tools. Because of practical limitations, we study an ensemble of simple defects to identify important trends and then extrapolate these results to more realistic structures. We find that a probe with many random defects will produce a small but significant coupling of energy between a linearly polarized input mode and a radial/longitudinal polarization mode, which is known to produce a strongly localized emitted optical field and is desirable for SNOM applications.

References

Mar 31, 2000·Ultramicroscopy·G Schurmann de Rooij NF
Jan 5, 2002·Journal of the Optical Society of America. A, Optics, Image Science, and Vision·J L BohnA Gallagher
Dec 3, 2003·Optics Letters·Radouane FikriDominique Barchiesi
Dec 23, 2003·Journal of the Optical Society of America. A, Optics, Image Science, and Vision·Wan-Xin Sun, Ze-Xiang Shen
Aug 2, 2005·Journal of the Optical Society of America. A, Optics, Image Science, and Vision·Emiliano DescroviHans-Peter Herzig

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