Abstract
Tapered dielectric flbers are widely used in the near fleld microscopy to focus the incident beam or collect near fleld signal. Single mode is always required so that the geometrical dimension of the waveguide is smaller than the wavelength. This paper proposes an inexpensive and easy fabrication of multimode tapered Te∞on probe which has bigger dimensions than the wavelength. The fleld distribution in and outside the probe is analyzed by the total internal re∞ection theorem and solid core circular dielectric waveguide theory. Simulations are carried out in Microwave Studio CST. Novel applications based on focal points in and outside the probe are discussed, especially dielectric permittivity sensing of biomolecules using a capillary tube is emphasized by the simulations and experiments.
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