Asynchronous optical sampling of on-chip terahertz devices for real-time sensing and imaging applications
We demonstrate that asynchronous optical sampling (ASOPS) can be used to measure the propagation of terahertz (THz) bandwidth pulses in a coplanar waveguide device with integrated photoconductive switches used for signal excitation and detection. We assess the performance of the ASOPS technique as a...
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Veröffentlicht in: | Optics express 2024-07, Vol.32 (16), p.27940 |
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creator | Mosley, Connor D W Tucker, Robyn Nixon, Joshua P R Park, SaeJune Li, Lianhe Freeman, Joshua R Wood, Christopher D Linfield, Edmund H Davies, A Giles Cunningham, John E |
description | We demonstrate that asynchronous optical sampling (ASOPS) can be used to measure the propagation of terahertz (THz) bandwidth pulses in a coplanar waveguide device with integrated photoconductive switches used for signal excitation and detection. We assess the performance of the ASOPS technique as a function of measurement duration, showing the ability to acquire full THz time-domain traces at rates up to 100 Hz. We observe a peak dynamic range of 40 dB for the shortest measurement duration of 10 ms, increasing to 88 dB with a measurement time of 500 s. Our work opens a route to real-time video-rate imaging via modalities using scanned THz waveguides, as well as real-time THz sensing of small volume analytes; we benchmark our on-chip ASOPS measurements against previously published simulations of scanning THz sensor devices, demonstrating sufficient dynamic range to underpin future video-rate THz spectroscopy measurements with these devices. |
doi_str_mv | 10.1364/OE.529890 |
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title | Asynchronous optical sampling of on-chip terahertz devices for real-time sensing and imaging applications |
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