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Wide angle near-field optical probes by reverse tube etching (Articolo in rivista)

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Wide angle near-field optical probes by reverse tube etching (Articolo in rivista) (literal)

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Patane, S; Cefali, E; Arena, A; Gucciardi, PG; Allegrini, M (2006)
Wide angle near-field optical probes by reverse tube etching
in Ultramicroscopy (Amst.)
(literal)

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Univ Messina, Dipartimento Fis Mat & Tecnol Fis Avanzate, I-98166 Messina, Italy CNR, Ist Proc Chim Fis, Sez Messina, I-98123 Messina, Italy Univ Pisa, Dipartimento Fis Enrivo Fermi, I-56127 Pisa, Italy (literal)

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We present a simple modification of the tube etching process for the fabrication of fiber probes for near-field optical microscopy. It increases the taper angle of the probe by a factor of two. The novelty is that the fiber is immersed in hydrofluoric acid and chemically etched in an upside-down geometry. The tip formation occurs inside the micrometer tube cavity formed by the polymeric jacket. By applying this approach, called reverse tube etching, to multimode fibers with 200/250 mu m core/cladding diameter, we have fabricated tapered regions featuring high surface smoothness and average cone angles of similar to 30 degrees. A simple model based on the crucial role of the gravity in removing the etching products, explains the tip formation process. (literal)

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