Fig. 4: Modulation frequency response for selective multispectral photodetections. | Light: Science & Applications

Fig. 4: Modulation frequency response for selective multispectral photodetections.

From: Huge upconversion luminescence enhancement by a cascade optical field modulation strategy facilitating selective multispectral narrow-band near-infrared photodetection

Fig. 4

a Schematic drawing illustrating the mechanism for the selective multispectral dependence of the emission on the excitation frequency. b, c Relative UCL intensity upon changing the excitation light frequency (b) and simultaneously varying the excitation power density (c)

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