Fast Modulation of Terahertz Quantum Cascade Lasers Using Graphene Loaded Plasmonic Antennas
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- 作者：Riccardo Degl’Innocenti ; David S. Jessop ; Christian W. O. Sol ; Long Xiao ; Stephen J. Kindness ; Hungyen Lin ; J. Axel Zeitler ; Philipp Braeuninger-Weimer ; Stephan Hofmann ; Yuan Ren ; Varun S. Kamboj ; Jonathan P. Griffiths ; Harvey E. Beere ; David A. Ritchie
- 刊名：ACS Photonics
- 出版年：2016
- 出版时间：March 16, 2016
- 年：2016
- 卷：3
- 期：3
- 页码：464-470
- 全文大小：538K
- ISSN：2330-4022
文摘
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.