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Development of a millimeter-long Travelling wave THz photomixer

Fuanki Bavedila 1 Charbel Tannoury 1 Quyang Lin 1 Sylvie Lepilliet 1, 2 Vanessa Avramovic 2, 1 Etienne Okada 1, 2 Dmitri Yarekha 1, 3 Marc Faucher 1, 4 David Troadec 1, 3 Jean-Francois Lampin 1, 5 Guillaume Ducournau 1, 5 Goulc'Hen Loas 6 Vincent Magnin 1, 7 Emilien Peytavit 5, 1
2 PCMP - IEMN - Plateforme de Caractérisation Multi-Physiques - IEMN
IEMN - Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520
3 CMNF - IEMN - Centrale de Micro Nano Fabrication - IEMN
IEMN - Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520
4 NAM6 - IEMN - Nano and Microsystems - IEMN
IEMN - Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520
5 PHOTONIQUE THZ - IEMN - Photonique THz - IEMN
IEMN - Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520
7 OPTO - IEMN - Optoélectronique - IEMN
IEMN - Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520
Abstract : THz sources based on the optical-heterodyne (photo)mixing in an ultrafast photodetector are very promising since they operate at room temperature, are potentially compact, cost-efficient and, above all, are widely frequencytunable. However, their widespread use is currently hampered by available power levels in the µW range at THz frequencies. We present here a travelling wave structure, with millimeter level coherence length at THz frequencies opening the way to large active area (~4000 µm 2) photomixing devices capable of handling optical pump power beyond 1 W well beyond the capabilities of standard lumped-element devices using small active areas (<50 µm 2) needed to maintain a capacitance level (<10 fF) compatible with THz operation. It is based on a silicon nitride waveguide coupled to a membrane-supported lowtemperature-grown GaAs photoconductor embedded in a coplanar waveguide. Milliwatt power levels up to 1 THz and still above 1 µW up to 4 THz are expected according to the optoelectronics model of this device elaborated in this study. Experimentally, the frequency response of a 1-mm-long structure, measured up to 100 GHz by using the beatnote produced by two 780-nm-DFB lasers, shows clearly the expected travelling wave signature consisting in a 6-dB-decrease ending at ~50 GHz when the contribution of the backward travelling wave is fully cancelled, following by a constant level up to ~100 GHz. The experimental demonstration of operation in the travelling wave regime is a first step towards the fulfillment of the original promises of this concept in terms of power level and frequency bandwidth.
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https://hal.archives-ouvertes.fr/hal-03264678
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Submitted on : Tuesday, June 29, 2021 - 12:29:55 PM
Last modification on : Friday, December 3, 2021 - 3:56:03 PM
Long-term archiving on: : Thursday, September 30, 2021 - 6:03:30 PM

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Fuanki Bavedila, Charbel Tannoury, Quyang Lin, Sylvie Lepilliet, Vanessa Avramovic, et al.. Development of a millimeter-long Travelling wave THz photomixer. Journal of Lightwave Technology, Institute of Electrical and Electronics Engineers (IEEE)/Optical Society of America(OSA), 2021, 39 (14), pp.4700-4709. ⟨10.1109/JLT.2021.3078226⟩. ⟨hal-03264678⟩

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