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. Hanoi College of Technology Ho Duc Vinh Mapping WGMs of Erbium doped glass microsphere using Near-field optical probe Mapping WGMs of Erbium doped glass microsphere using Near-field optical probe Master. 2 Coupling Microsphere WGMs based on near-field optics Ho Duc Vinh K10N 22 Chapter 2: Coupling Microsphere WGMs based on Near-field Optics 2.1. Introduction of Near-field optics Near-field optics. Resonances (MDRs -WGMs) 1.1. Dielectric Microsphere - A simple Model of WGMs: Microspheres act as high Q resonators in optical regime. The curved surface of a microshere leads to efficient confinement of light