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Development of an LC non-resonant detector for mid-infrared photothermal (MIP) microscopy
Ting Pan1,2,3, Tang-Xiu Li2, Jian-Ping Yang2
1CAS Key Laboratory of Chemistry of Northwestern Plant Resources, Key Laboratory for Natural Medicines of Gansu Province, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences (CAS), Lanzhou 730000, People's Republic of China.
None:
An inductor-capacitor (LC) non-resonant photodiode detector has been developed and optimized for the signal characteristics of mid-infrared photothermal (MIP) microscopy. The detector incorporates a large photosensitive area (diameter = 5 mm), a flat frequency response, direct current-alternating current (DC-AC) separation, and a single-photodiode configuration. A gain of 2.7 × 104 is achieved for weak AC signals, with a wide-flat -3 dB frequency response ranging from 4.7 kHz to 2.1 MHz. Compared with that of built-in detector of a standard MIP instrument, the signal-to-noise ratio of MIP imaging is increased by ∼5 times. The detector is simple to operate, highly resistant to external noise, and fulfills the imaging requirements of MIP experiments.
