Active multipixel photoconductive emitter technology for THz beam shaping and steering

Nishtha Chopra; Justas Deveikis; James Lloyd-Hughes

doi:10.1117/12.2681396

4 October 2023 Active multipixel photoconductive emitter technology for THz beam shaping and steering

Nishtha Chopra, Justas Deveikis, James Lloyd-Hughes

Proceedings Volume 12683, Terahertz Emitters, Receivers, and Applications XIV; 1268304 (2023) https://doi.org/10.1117/12.2681396
Event: SPIE Optical Engineering + Applications, 2023, San Diego, California, United States

Abstract

A multipixel photoconductive emitter which consisted of an array of interdigitated electrodes was used to electrically control the spatial profile of a THz beam. We demonstrated that by varying the applied voltage levels, it is possible to spatially modulate the THz beam, with shapes tunable from gaussian to arbitrary non-gaussian shapes, such as a top hat. We characterized the THz beam profile at different off-axis transverse positions to validate the beam steering capability of our device. The spatial resolution of the approach was determined for different THz frequencies and the diffraction-limited performance of the system was established by comparison with the Abb´e and Sparrow criteria. We further discuss the scalability of this technology by demonstrating design variations that provide a multilevel THz beam functionality. By varying the emitter’s geometry to adjacent horizontal and vertical pixels, THz beams with either azimuthal, radial, or linear polarization states can be generated that circumvent the need for mechanical polarization optics. The device can be integrated into a compact fibre-based system to realize the fast measurement of both s- and p- polarization states relevant for in-vivo skin diagnostics.

Conference Presentation

(2023) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Nishtha Chopra, Justas Deveikis, and James Lloyd-Hughes "Active multipixel photoconductive emitter technology for THz beam shaping and steering", Proc. SPIE 12683, Terahertz Emitters, Receivers, and Applications XIV, 1268304 (4 October 2023); https://doi.org/10.1117/12.2681396

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