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A compact and cost‐efficient all‐electronic terahertz (THz) system is presented for the spectroscopic read‐out of marker‐free THz biosensor chips. The table‐top system is based on only one oscillator for emitter and quasi‐heterodyne detector operation. Frequency mixing is applied to perform THz signal frequency sweeps from 220 to 320 GHz in less than 250 μs. The concept is explained and demonstrated...
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