Hussein Ssali, Yoshiki Kamiura, Yuanhao Li, Bo Li, Ming Che, Kazutoshi Kato
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Enhanced terahertz wave generation by an antenna-coupled 4 × 1 UTC-PD array and a T-junction combiner.
The terahertz (THz) band holds transformative potential for next-generation communication and sensing systems, yet practical deployment remains hindered by limited output power from available electronic and photonic THz sources. In this work, we demonstrate an on-chip optoelectronic THz wave power enhancement approach by monolithically integrating a microstrip patch antenna and a 4 × 1 T-junction combiner with arrayed InGaAs/InP uni-traveling carrier photodiodes (UTC-PDs) on a silicon carbide (SiC) substrate. Relative to a single UTC-PD device, experimental results show a 10.9 dB increase in detected power at 300 GHz when combining photocurrents from four UTC-PDs biased at -1 V, closely aligning with theoretical predictions of scaling characteristics of current-driven sources. This work also establishes that SiC has the potential to be a robust platform for high-power THz systems.
期刊介绍：
The Optical Society (OSA) publishes high-quality, peer-reviewed articles in its portfolio of journals, which serve the full breadth of the optics and photonics community.
Optics Letters offers rapid dissemination of new results in all areas of optics with short, original, peer-reviewed communications. Optics Letters covers the latest research in optical science, including optical measurements, optical components and devices, atmospheric optics, biomedical optics, Fourier optics, integrated optics, optical processing, optoelectronics, lasers, nonlinear optics, optical storage and holography, optical coherence, polarization, quantum electronics, ultrafast optical phenomena, photonic crystals, and fiber optics. Criteria used in determining acceptability of contributions include newsworthiness to a substantial part of the optics community and the effect of rapid publication on the research of others. This journal, published twice each month, is where readers look for the latest discoveries in optics.
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