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(a) Schematic representation of the multiple reflections of the light rays in the SNOM fiber-end hot region of length . The radius of the ray bundle (with circular section) is . Note that the metalized cone walls reflect light rays as mirrors and keep constant. (b) The reflections of the more external rays define the quotes and the cone lateral area illuminated by the reflected bundle of rays (gray section in the picture). After reflections, the angle of the bundle with the cone axis is . The quotes are then found through the relations: ;.
(a) Power absorbed by a fiber slice of thickness as a function of the quote . Note that the maximum is greater for smaller angles (, ), i.e., is for sharper conical profiles. Due to multiple reflections by the cone walls, light is focused close to the tip apex. Note that the focusing effect is greater for sharper tips (smaller angles). (b) Graphical representation of the power absorbed by a fiber slice of thickness as a function of the quote in the case of a weighted distribution of ten angles in the range 0–10°.
Calculated (solid line) and measured (dots) probe temperature profile for an aluminum coated probe with , , and . The experimental temperature profile is taken from previously reported data (Ref. 12).
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