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(a) Schematic description of the device used in the measurements. (b) The applied bias voltage profile and (c) normalized differential probe transmission ( as defined in text) are plotted as a function of wavelength and time. Wavelength dependent switching between saturable and NA is observed upon application of the bias (pump excitation energy of , center wavelength of 790 nm, pulse width of 44 fs). The dashed lines are guidelines for the eyes, delineating the transition wavelength between saturable and NA. (d) Differential absorption plotted as a function of wavelength for three representative points with different bias conditions [regions I, II, and III in (c)] showing NA and SA.
Differential absorption of probe at zero pump-probe delay. (a)–(c) show voltage bias dependence. (d)–(f) Changes in the response upon high-intensity pump exposure for various durations. Similar changes are observed for electrochemical and photothermal reduction.
(a) Temporal behavior of the saturated and NA responses at different probe wavelengths after applying bias voltage. (b) Temporal behavior of the saturated and NA responses at 750 nm probe wavelength depending on the exposure time to pump (pump excitation energy of , center wavelength of 790 nm, pulse width of 44 fs).
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