Asynchronous optical sampling of on-chip terahertz devices for real-time sensing and imaging applications

Author:

Mosley Connor D. W.ORCID,Tucker Robyn,Nixon Joshua P. R.,Park SaeJune1ORCID,Li LianheORCID,Freeman Joshua R.ORCID,Wood Christopher D.,Linfield Edmund H.ORCID,Davies A. GilesORCID,Cunningham John E.ORCID

Affiliation:

1. Queen Mary University of London

Abstract

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.

Funder

Engineering and Physical Sciences Research Council

Publisher

Optica Publishing Group

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