For each sample at least four OFF-ON pairs were modelled, corresponding to the time frame of the biggest extinction change. By comparing sample 1 (Au) and 3 (no Au) presented in the Figure (bottom and top, respectively), we recognize that intervention causes slope change only for sample containing AuNRs. This manifests as a characteristic breaking of the linear trend of the data at the times corresponding to the intervention (so-called Ramp effect) and is in contrast to the overall smooth linear trend for the control sample without gold (Figure , see also Figure for samples 2 and 4). Based on the ARIMA modelling (for selected p, d, and q parameters, Table ), we estimated values of the Ramp effect upon intervention (Table ). Negative values imply that the extinction at the maximum of the 𝜋 → 𝜋 * band is changing faster under irradiation. This means that AzoGly isomerization rate increases during light intervals comparing to dark conditions. Visual assessment and point estimates of the Ramp effect are, however, not sufficient for making statistical statements about the significance of the observed slope differences. After taking into account the uncertainty of estimation and correcting for multiple comparisons, we calculated p-values for tests of significance of the Ramp effect (Table ). At 5% significance level, we treat effects with p-values smaller than 0.05 as significantly different from 0. Testing results (Figure ) confirm that the statistical significance of the Ramp effect (slope change upon irradiation) is observed only for sample containing gold. There is no statistical significance of the Ramp effect values for sample without gold. Conclusions are identical for samples 2 and 4 (Figure ). Testing results prove that introduction of AuNRs enables indirect control over AzoGly isomerization kinetics in the hybrid material in an ON-OFF manner.