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Near-Field THz Imaging and Spectroscopy Using a Multiple Subwavelength Aperture Modulator

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2 Author(s)
Jędrzej Szelc ; Optoelectronics Research Centre, Infrared Science and Technology Group, University of Southampton, Southampton, U.K. ; Harvey Rutt

We present a near-field, simultaneous multiple pixel subwavelength THz transmission imaging device based on a solid-state THz spatial modulator. Frequency-division multiplexing is used to acquire multiple pixels simultaneously. The modulator was used to acquire THz transmission images with λ/4 resolution at 118 μm. The image acquisition speed is 16 times greater than that of a comparable single-aperture subwavelength imaging technique. Additionally, spectroscopic THz imaging with subwavelength spatial resolution can be accomplished with the modulator, and the technique is scalable to at least 100 simultaneous pixels.

Published in:

IEEE Transactions on Terahertz Science and Technology  (Volume:3 ,  Issue: 2 )