Abstract
Compact and coherent source is a key component for various applications of the terahertz (THz) wave. We report on our recent results of THz oscillators using resonant tunneling diodes (RTDs). To achieve high-frequency oscillation, the electron delay time of RTD was reduced with a narrow quantum well and an optimized collector spacer thickness. Conduction loss at the air bridge connecting RTD and slot antenna, which works as a resonator and a radiator, was also reduced. By these structures, a fundamental oscillation up to 1.92 THz was obtained at room temperature. Theoretical calculation shows that an oscillation over 2 THz is further expected by improved structures of RTD and antenna. Using the offset slot antenna and two-element array configuration, high output power of 0.61 mW was obtained at 620 GHz. A direct intensity modulation of RTD oscillators up to 30 GHz, which is useful for high-speed wireless data transmission, was demonstrated. By the integration of a varactor diode, wide frequency sweep of 580–700 GHz in a single device and 580–900 GHz in a four-element array were also demonstrated. This result expands possible applications of RTD oscillators.
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Acknowledgments
The authors thank Honorary Prof. Y. Suematsu and Emeritus Prof. K. Furuya at the Tokyo Institute of Technology for continuous encouragement. The authors also acknowledge Prof. S. Arai, Prof. Y. Miyamoto, and Assoc. Profs. M. Watanabe and N. Nishiyama for stimulating discussions. This work was supported by a grant-in-aid from Japan Society for the Promotion of Science; the Industry–Academia Collaborative R&D Program and the CREST Program from Japan Science and Technology Agency; and the Strategic Information and Communication R&D Promotion Programme from the Ministry of Internal Affairs and Communications.
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Asada, M., Suzuki, S. Room-Temperature Oscillation of Resonant Tunneling Diodes close to 2 THz and Their Functions for Various Applications. J Infrared Milli Terahz Waves 37, 1185–1198 (2016). https://doi.org/10.1007/s10762-016-0321-6
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DOI: https://doi.org/10.1007/s10762-016-0321-6