Abstract
A broadband fast detector of electromagnetic radiation in the visible and near-infrared spectral range is prepared from laser-induced graphene (LIG) obtained by thermal decomposition of a polyimide film. The thermal resistance coefficient of the LIG and resistive responsivity of LIG detector to 532 nm laser power reach up to ∼0.05%K−1 and ∼0.16 %mW−1, respectively, at ambient conditions. The working frequency of LIG detector is spread over 10 kHz, which is explained by the contributions of two different mechanisms: the thermal heating of the graphene and the photogating effect. The photoresponse spectral characteristic of the LIG detector is similar to that of black body radiation with the exception of the tiny peculiarities associated with absorption of light by the optical setup, as well as with the processes of photoelectron generation in the LIG.
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