Revolutionizing High-Power Terahertz Technologies with Diode Chains

Terahertz radiation, falling between microwave and infrared light frequencies, is essential for various technologies like imaging tools and wireless communication systems. However, generating strong and continuous terahertz signals using current electronics is a significant challenge.

Engineers often resort to frequency multipliers, electronic circuits that distort input signals to produce desired output frequencies, to reliably generate terahertz signals. Some of these circuits use Schottky barrier diodes, which are metal-semiconductor junction devices providing one-way electrical contact.

While frequency multipliers based on Schottky barrier diodes have shown promise, individual diodes have energy limitations. To enhance energy handling, engineers often use diode chains. However, uneven electromagnetic field distribution between diodes in a chain can be a drawback.

Recently, researchers at the University of Electronic Science and Technology introduced a new diode chain design that addresses this limitation by reshaping local electromagnetic fields for more uniform distribution along the chain. This asymmetric C-shaped diode chain demonstrated higher frequency multiplication efficiency compared to existing diode-based frequency multipliers.

The new design features diodes arranged in an asymmetric double-layer C-shaped chain to improve electromagnetic field flow between diodes. Simulations and lab tests confirmed its high terahertz frequency-doubling efficiency, making it a promising frequency multiplier.

The researchers’ innovative diode chain structure achieved a frequency doubling efficiency of 38%, with an output exceeding 300 mW at 170 GHz. This breakthrough could lead to the development of more compact terahertz wave transmitters, enabling advanced imaging, sensing, and communication systems.

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