Fig. 4: Transient photoresponse time of the MoTe2/OWG devices. | Nature Communications

Fig. 4: Transient photoresponse time of the MoTe2/OWG devices.

From: Ultra-broadband all-optical nonlinear activation function enabled by MoTe2/optical waveguide integrated devices

Fig. 4

a Transient absorption spectrum of MoTe2 excited by 400 nm at a pulse width of 200 fs. The change in optical absorption is in units of optical density (OD or mOD, where 1 OD = 1 × 103 mOD.) obtained from the probe intensities when the sample is pumped and unpumped. Black box range represents the positive photoinduced absorption (PIA) signal. Red box range is the negative photobleaching (PB) signal. b Transient absorption spectra with different pump-probe time delays. c Decay profiles of transient differential absorption monitored at different wavelengths. The solid lines represent the corresponding fitting results. d Transient reflection dynamics of MoTe2 at 520 nm with a pump intensity of 4.10 GW cm−2, while the solid lines represent the fitting. ∆R is the change in reflection.

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