期刊
ACS PHOTONICS
卷 3, 期 3, 页码 464-470出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsphotonics.5b00672
关键词
terahertz optical modulator; graphene; plasmonic antennas; quantum cascade lasers
类别
资金
- Engineering and Physical Sciences Research Council [EP/J017671/1]
- UK EPSRC Research Grant [EP/L019922/1]
- EPSRC [EP/K016636/1]
- Engineering and Physical Sciences Research Council [1208829, EP/L019922/1, 1493579, EP/J017671/1, 1635658, EP/K016636/1] Funding Source: researchfish
- EPSRC [EP/J017671/1, EP/L019922/1, EP/K016636/1] Funding Source: UKRI
We report the fast amplitude modulation of a quantum cascade laser emitting in single-mode operation in the terahertz frequency range by employing compact, integrated devices based on the interplay between plasmonic antenna arrays and monolayer graphene. By acting on the carrier concentration of graphene, the optical response of these plasmonic resonances was modified. The modulator's characteristics have been studied by using both time domain spectroscopic laser systems, yielding the broad frequency response of these resonant arrays, and quantum cascade lasers, providing us with a narrow and stable laser source, a mandatory prerequisite for the determination of the modulation speed of these devices. The measured modulation speed exhibits a cutoff frequency of 5.5 MHz +/- 1.1 MHz. These results represent the first step toward the realization of fast integrated circuitry for communications in the terahertz frequency range.
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