The invention relates to a
chemical sensor, a method and application on the basis of
laser effects in a
fluorescence conjugated
polymer. The sensor comprises micro resonant cavities and the
fluorescence conjugated
polymer combined with the micro resonant cavities. The
fluorescence conjugated
polymer is not only used as a sensing material, but also used as a
laser gain medium. The fluorescence conjugated polymer is pumped by pulse
laser and is modulated by various micro resonant cavities to generate and output excited and irradiated laser. After the fluorescence conjugated polymer reacts with an
analyte, the
fluorescence intensity and the
gain coefficient of the polymer are changed so as to influence the laser propagation characteristic in the micro resonant cavities and change the output intensity of the laser, namely a sensing function can be realized. In the inention, the
high intensity, the monochromaticity and the threshold value characteristic of the laser are utilized, the defects of low intensity, wide spectrum and low anti-interference capacity of fluorescence in the conventional fluorescence
chemical sensor are overcome, and the
chemical sensor has high sensitivity, high response speed and strong anti-interference capacity. Short-distance and
remote detection of chemicals such as environmental pollutants, poison, chemical substances, biological material and the like can be realized simultaneously.