Kyoto University · 물리·천문학
Tomoki Hiraoka 교수의 연구실은 탄소 나노소재와 2차원 물질을 기반으로 한 초고속 전자 및 광전자 소자, 특히 테라헤르츠 대역에서의 응용을 중심으로 연구를 진행하고 있습니다. 메타물질과 나노안테나를 활용한 표면 플라즈몬 및 오비탈 운동량을 가진 빛의 제어, 초단시간 전자 동역학 제어, 그리고 저비용·저소비전력의 테라헤르츠 주파수 복합체 생성 기술 개발이 주요 연구 방향입니다. 특히, 반도체 다이오드 기반의 주기적 진동과 피드백 제어를 통해 고정밀 테라헤르츠 신호를 생성하는 기술은 분광학 및 고속 통신 분야에서의 응용 잠재력을 지닙니다.
표시된 성과는 수집된 데이터 기준으로 산출되며, 일부 차이가 있을 수 있습니다.
The emergence of the vortex beam with orbital angular momentum (OAM) has provided intriguing possibilities to induce optical transitions beyond the framework of the electric dipole interaction. The uniqueness stems from the OAM transfer from light to material, as demonstrated in electronic transitions in atomic systems. In this study, we report on the OAM transfer to electrons in solid-state systems, which has been elusive to date. Using metamaterials (periodically textured metallic disks), we s
Optical frequency combs in the terahertz frequency range are long-awaited frequency standards for spectroscopy of molecules and high-speed wireless communications. However, a terahertz frequency comb based on a low-cost, energy-efficient, and room-temperature-operating device remains unavailable especially in the frequency range of 0.1 to 3 THz. In this paper, we show that the resonant-tunneling-diode (RTD) oscillator can be passively mode-locked by optical feedback and generate a terahertz freq
Layered two-dimensional (2D) materials offer many promising avenues for advancing modern electronics, thanks to their tunable optical, electronic, and magnetic properties. Applying a strong electric field perpendicular to the layers, typically at the MV/cm level, is a highly effective way to control these properties. However, conventional methods to induce such fields employ electric circuit - based gating techniques, which are restricted to microwave response rates and face challenges in achiev
A resonant tunneling diode oscillator has been successfully injection-locked to a continuous terahertz wave. The locking range is about 50 MHz when the RTD emission power and the injection power are set to 10 μW and 4 μW, respectively. The dependence of the locking range to the injection power is consistent with the Adler's theory.
All the raw data and processed data used in the figures in the main text and Supplementary Information in the article "Passive mode-locking and terahertz frequency comb generation in resonant-tunneling-diode oscillator."
All the raw data and processed data used in the figures in the main text and Supplementary Information in the article "Passive mode-locking and terahertz frequency comb generation in resonant-tunneling-diode oscillator."
