Optical fiber tip in front of a phase conjugator: focused light spot with inclusion of evanescent field contribution |
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Authors: | Mufei Xiao |
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Institution: | (1) Institute of Physics-UNAM, Apartado Postal 2681, CP 22800 Ensenada, Baja California, México (Fax:+52 617 44603, E-mail: mufei@ifuname.ifisicaen.unam.mx), XX |
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Abstract: | Within the framework of electric dipole approximation, the focused light spot produced by a tiny optical fiber tip in front
of a phase conjugate mirror is investigated numerically. The fiber tip is the probe of a reflection scanning near field optical
microscope and the incident light is guided through the fiber. Intensity distribution of local field is calculated in the
half space where the fiber tip locates. Both homogeneous (q
‖≤ω/c
0) and part of inhomogeneous (ω/c
0<q
‖≤ωn/c
0) fields are included in establishing a field propagator (Green’s function) which is employed to calculate the local field
distribution. The local field forms at the tip position a diffraction light spot with a finite central value and a finite
size, and when the tip-surface distance is sufficient small, the strength and the shape of the light spot become a function
of the distance, which is due to the contribution of evanescent field. Fairly good agreements are found with the existing
experimental reports.
Received: 30 April 1996/Accepted: 19 August 1996 |
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Keywords: | PACS: 42 80 |
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