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30 March 1995 Subwavelength imaging of an etched fiber with an intracore Bragg grating by apertured photon scanning tunneling microscope
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Abstract
Apertured photon scanning tunneling microscopy (APSTM) was used to image the internal structure of an etched optical fiber with an intracore Bragg grating. Direct evidence of the subwavelength periodic variation of the index of refraction along the fiber is obtained by probing evanescent field intensity modulated by the etched fiber grating structure. The images we observed suggests local non-uniformity in the grating structure. Local anomalies appear in the values of the grating spacing. The modulation of the evanescent field intensity originates from variations in the index of refraction as well as from surface structure induced by etching of the fiber.
© (1995) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Din Ping Tsai, Yueh Liang Chung, and Andreas Othonos "Subwavelength imaging of an etched fiber with an intracore Bragg grating by apertured photon scanning tunneling microscope", Proc. SPIE 2384, Scanning Probe Microscopies III, (30 March 1995); https://doi.org/10.1117/12.205929
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