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Fig. 1 | PhotoniX

Fig. 1

From: Self-induced transparency in a perfectly absorbing chiral second-harmonic generator

Fig. 1

Illustration of self-induced transparency in a perfectly absorbing optical microcavity. (a) Schematic of a tapered fiber coupled lithium niobate microcavity with quadratic nonlinearity, where one-port input is perfectly absorbed inside the microcavity at (b) the critical coupling point (theoretical results). Loss factors consist of linear scattering, material absorption, and nonlinear loss through second harmonic generation, which breaks the perfect absorption state and leads to self-induced transparency in (c). (d) Moreover, the situation becomes more complex when both ports are excited by the fundamental waves \(\small {{\alpha }}_{1}\)(CW) and \(\small {{\alpha }}_{2}\)(CCW) and their second harmonic waves \(\small {{\beta }}_{1}\)(CW) and \(\small {{\beta }}_{2}\)(CCW) through the second-order nonlinearity \(\small {{\chi }}^{\left(2\right)}\). The optical waves in each direction are coupled through the linear scattering processes, i.e., \(\small {\text{J}}_{12}/{\text{J}}_{21}\) and \(\small {\text{I}}_{12}/{\text{I}}_{21}\)

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