New LC photodiode detector increases signal-to-noise ratio in mid-infrared microscopy by five times, suggesting improved imaging performance.
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.
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Pan et al. (2025) studied this question.
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