期刊
NANO LETTERS
卷 15, 期 5, 页码 3501-3506出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.5b00869
关键词
Terahertz; external modulator; double-channel heterostructure; composite metamaterial
类别
资金
- National Natural Science Foundation of China [61370011, 61072036]
- National High-tech Research and Development Projects of China [2011AA010204]
- National Key Program of Fundamental Research of China [2014CB339806]
- Program for New Century Excellent Talents from the Ministry of Education of China [NECT_13_0100]
- Sichuan Province Youth Science and Technology Foundation [2014JQ0013]
The past few decades have witnessed a substantial increase in terahertz (THz) research. Utilizing THz waves to transmit communication and imaging data has created a high demand for phase and amplitude modulation. However, current active THz devices, including modulators and switches, still cannot meet THz system demands. Double-channel heterostructures, an alternative semiconductor system, can support nanoscale two-dimensional electron gases (2DEGs) with high carrier concentration and mobility and provide a new way to develop active THz devices. In this Letter, we present a composite metamaterial structure that combines an equivalent collective dipolar array with a double-channel heterostructure to obtain an effective, ultrafast, and all-electronic grid-controlled THz modulator. Electrical control allows for resonant mode conversion between two different dipolar resonances in the active device, which Significantly improves the modulation speed and depth. This THz modulator is the first to achieve a 1 GHz modulation speed and 85% modulation depth during real-time dynamic tests. Moreover, a 1.19 rad phase shift was realized. A wireless free-space-modulation THz communication system based on this external THz modulator was tested using 0.2 Gbps eye patterns. Therefore, this active composite metamaterial modulator provides a basis for the development of effective and ultrafast dynamic devices for THz wireless communication and imaging systems.
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