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Significance The premise for developing optical sensors is to guarantee the accurateness and robustness of sensing performance. However, for normalizing signals between samples and reference, the calibration step is always… Click to show full abstract
Significance The premise for developing optical sensors is to guarantee the accurateness and robustness of sensing performance. However, for normalizing signals between samples and reference, the calibration step is always accompanied by environmental noise to undermine the real sensing data. Here, we address this limitation by exploiting an optically controlled terahertz (THz) ultrafast metasurface. The typical measurement errors are completely eliminated through judiciously engineering two transmission spectra between picosecond time delays, to make the sensing calibration-free, high precision, and robust. This work paves an avenue to acquire subtle information and can be extended to series of biosensing applications.
Journal Title: Proceedings of the National Academy of Sciences of the United States of America
Year Published: 2022
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