期刊
OPTICS EXPRESS
卷 27, 期 24, 页码 35257-35266出版社
OPTICAL SOC AMER
DOI: 10.1364/OE.27.035257
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资金
- H2020 Marie Sklodowska-Curie Actions [713694, 748519]
- H2020 European Research Council [756966]
- Engineering and Physical Sciences Research Council
- Royal Academy of Engineering
- European Research Council (ERC) [756966] Funding Source: European Research Council (ERC)
- Marie Curie Actions (MSCA) [713694, 748519] Funding Source: Marie Curie Actions (MSCA)
The Terahertz or millimeter wave frequency band (300 GHz - 3 THz) is spectrally located between microwaves and infrared light and has attracted significant interest for applications in broadband wireless communications, space-borne radiometers for Earth remote sensing, astrophysics, and imaging. In particular optically generated THz waves are of high interest for low-noise signal generation. Here, we propose and demonstrate stabilized terahertz wave generation using a microresonator-based frequency comb (microcomb). A unitravelling-carrier photodiode (UTC-PD) converts low-noise optical soliton pulses from the microcomb to a terahertz wave at the soliton's repetition rate (331 GHz). With a free-running microcomb, the Allan deviation of the Terahertz signal is 4.5x10(-9) at 1 s measurement time with a phase noise of -72 dBc/Hz (-118 dBc/Hz) at 10 kHz (10 MHz) offset frequency. By locking the repetition rate to an in-house hydrogen maser, in-loop fractional frequency stabilities of 9.6x10(-15) and 1.9x10(-17) are obtained at averaging times of 1 s and 2000 s respectively, indicating that the stability of the generated THz wave is limited by the maser reference signal. Moreover, the terahertz signal is successfully used to perform a proof-of-principle demonstration of terahertz imaging of peanuts. Combining the monolithically integrated UTC-PD with an on-chip microcomb, the demonstrated technique could provide a route towards highly stable continuous terahertz wave generation in chip-scale packages for out-of-the-lab applications. In particular, such systems would be useful as compact tools for high-capacity wireless communication, spectroscopy, imaging, remote sensing, and astrophysical applications. Published by The Optical Society under the terms of the Creative Commons Attribution 4.0 License.
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