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Fig. 2 | PhotoniX

Fig. 2

From: Spontaneous emission in micro- or nanophotonic structures

Fig. 2

The basic concepts of WGMs. a Schematic of WGM toroid microcavity [3]. b Schematic of self-reinforced light by total internal reflection [69]. c The typical electric field distribution of WGM in a microsphere [70]. d The radial field distribution of mode shown in (c) [70]. The x-axis in (d) represents radius distance from center, and the unit is μm

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