➀ Terahertz radiation faces challenges in generating strong, continuous signals, with existing diode chains suffering from uneven electromagnetic field distribution;

➁ Researchers designed an asymmetric C-shaped diode chain to reshape electromagnetic fields, achieving a frequency-doubling efficiency of 38% and over 300 mW output at 170 GHz;

➂ This innovation enables compact terahertz transmitters for advanced imaging, sensing, and communication systems.