Terahertz phase imaging of large-aperture liquid crystal modulator with ITO interdigitated electrode

Terahertz phase imaging of large-aperture liquid crystal modulator with ITO interdigitated electrode

We have fabricated and characterized a large-aperture electrooptic phase modulation device operating in the terahertz (THz) frequency range. The device consists of a 1.6 mm thick nematic liquid crystal placed between glass plates with a novel interdigitated electrode design. Using THz time-domain sp...

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Veröffentlicht in:Journal of physics. D, Applied physics Applied physics, 2024-12, Vol.57 (50), p.505101
Hauptverfasser: Le Bourlout, A, Pusenkova, A, Lafrenière-Greig, J, Ropagnol, X, Galstian, T, Blanchard, F
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liquid crystal
phase plate
terahertz
time-domain spectroscopy
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container_issue 50
container_start_page 505101
container_title Journal of physics. D, Applied physics
container_volume 57
creator Le Bourlout, A
Pusenkova, A
Lafrenière-Greig, J
Ropagnol, X
Galstian, T
Blanchard, F
description We have fabricated and characterized a large-aperture electrooptic phase modulation device operating in the terahertz (THz) frequency range. The device consists of a 1.6 mm thick nematic liquid crystal placed between glass plates with a novel interdigitated electrode design. Using THz time-domain spectroscopy (THz-TDS) coupled with raster scanning imaging, we evaluated phase modulation across a 25 mm diameter LC device and mapped the spatial uniformity of phase shift. Our results confirm the functionality of the LC cell as a controllable quarter-wave plate at 0.26 THz and half-wave plate at 0.52 THz. This work contributes to the development of large-aperture and transmissive LC devices as low-cost phase plates for THz waves and paves the way for future applications in THz modulators.
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subjects liquid crystal
phase plate
terahertz
time-domain spectroscopy
title Terahertz phase imaging of large-aperture liquid crystal modulator with ITO interdigitated electrode
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