Abstract-The active modulation of flexible terahertz tube

Jing Liu, Hongyu Ji, Jingling Shen, Cunlin Zhang, Yuejin Zhao,


https://www.sciencedirect.com/science/article/abs/pii/S0925346719304756

We demonstrated a flexible polyimide terahertz tube that can modulate Terahertz (THz) wave efficiently based on indium oxide (In2O3) nanoparticle. The transmission of the THz pulse can be modulated using optical control over 0.2 to 2.6 THz, and the modulation depth reached up to 14%. By combining nano-indium oxide layer with metal periodic metamaterial structure, the modulation was optimized to 35%. The results show that a photo-excited tunable terahertz modulator can be realized by irradiating the structure under different intensity of the laser beam.

Abstract-Printing sub-THz wire grid polarizers using a composite liquid metal ink

Margherita M. P. Colleoni; Qian Wang; Jing Liu; Borja Vidal

https://www.spiedigitallibrary.org/conference-proceedings-of-spie/10103/101031T/Printing-sub-THz-wire-grid-polarizers-using-a-composite-liquid/10.1117/12.2251491.pdf?SSO=1

A low-cost method to ink-jet print terahertz polarizers is presented. A liquid metal printer is used to deliver an eutectic Gallium and Indium alloy (EGaIn24.5) onto polyvinyl chloride film substrates to create flexible wire grid polarizers (10 x 20 mm) in the sub-THz band with a nominal pitch of 200 μm and 300 μm, respectively. A Terahertz Time Domain Spectroscopy (THz-TDS) setup has been used to characterize the polarizers. The experimental results have been compared with FIT (Finite Integration Technique) simulations (CST Studio) showing good agreement. The characterization of the polarizers shows an extinction ratio up to 14 dB in the 0.1-0.7 THz and low loss (<1 dB). A microscopic characterization of the polarizers shows a variance in the line spacing of about 9%. This fabrication method allows a quick and cost-effective approach for the development of sub-THz polarizers to be used in polarization-resolved spectroscopy, polarimetric quality monitoring sensors and the characterization of THz components.

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