Wang Wenting, Lu Ping-Keng, Vinod Abhinav Kumar, Turan Deniz, McMillan James F, Liu Hao, Yu Mingbin, Kwong Dim-Lee, Jarrahi Mona, Wong Chee Wei
Fang Lu Mesoscopic Optics and Quantum Electronics Laboratory, University of California, Los Angeles, CA, 90095, USA.
Terahertz Electronics Laboratory, University of California, Los Angeles, CA, 90095, USA.
Nat Commun. 2022 Aug 31;13(1):5123. doi: 10.1038/s41467-022-32739-6.
High-spectral-purity frequency-agile room-temperature sources in the terahertz spectrum are foundational elements for imaging, sensing, metrology, and communications. Here we present a chip-scale optical parametric oscillator based on an integrated nonlinear microresonator that provides broadly tunable single-frequency and multi-frequency oscillators in the terahertz regime. Through optical-to-terahertz down-conversion using a plasmonic nanoantenna array, coherent terahertz radiation spanning 2.8-octaves is achieved from 330 GHz to 2.3 THz, with ≈20 GHz cavity-mode-limited frequency tuning step and ≈10 MHz intracavity-mode continuous frequency tuning range at each step. By controlling the microresonator intracavity power and pump-resonance detuning, tunable multi-frequency terahertz oscillators are also realized. Furthermore, by stabilizing the microresonator pump power and wavelength, sub-100 Hz linewidth of the terahertz radiation with 10 residual frequency instability is demonstrated. The room-temperature generation of both single-frequency, frequency-agile terahertz radiation and multi-frequency terahertz oscillators in the chip-scale platform offers unique capabilities in metrology, sensing, imaging and communications.
太赫兹光谱中高光谱纯度的频率捷变室温源是成像、传感、计量和通信的基础元件。在此，我们展示了一种基于集成非线性微谐振器的芯片级光学参量振荡器，它在太赫兹频段提供了广泛可调谐的单频和多频振荡器。通过使用等离子体纳米天线阵列进行光到太赫兹的下转换，实现了从330 GHz到2.3 THz跨越2.8个倍频程的相干太赫兹辐射，每个步骤的腔模限制频率调谐步长约为20 GHz，腔内模连续频率调谐范围约为10 MHz。通过控制微谐振器腔内功率和泵浦 - 谐振失谐，还实现了可调谐多频太赫兹振荡器。此外，通过稳定微谐振器泵浦功率和波长，展示了具有10⁻⁹频率不稳定性的太赫兹辐射亚100 Hz线宽。在芯片级平台上室温产生单频、频率捷变太赫兹辐射和多频太赫兹振荡器在计量、传感、成像和通信方面提供了独特的能力。
