Carbon-based terahertz devices

Xiaowei He; Weilu Gao; Qi Zhang; Lei Ren; Junichiro Kono

doi:10.1117/12.2185159

28 May 2015 Carbon-based terahertz devices

Xiaowei He, Weilu Gao, Qi Zhang, Lei Ren, Junichiro Kono

Proceedings Volume 9476, Automatic Target Recognition XXV; 947612 (2015) https://doi.org/10.1117/12.2185159
Event: SPIE Defense + Security, 2015, Baltimore, MD, United States

Abstract

Carbon nanotubes and graphene are promising for diverse terahertz (THz) device applications. Here, we summarize our recent studies on the THz dynamic conductivities and optoelectronic devices of these materials in the THz region. We show that the THz response of single-wall carbon nanotubes (SWCNTs) is dominated by plasmon oscillations along the nanotubes, which lead to extremely anisotropic THz conductivities. By utilizing the strong THz plasmon resonance as well as its pronounced anisotropy in aligned SWCNT films, we built THz polarizers with perfect performance and polarization-sensitive THz detectors that work at room temperature. In addition, we studied the THz conductivities of graphene samples with and without electrical gating. We demonstrated excitation and active control of surface plasmon polaritons in graphene, as well as a graphene THz modulator with a high modulation depth, a high modulation speed, and a designable resonance frequency.

Citation Download Citation

Xiaowei He, Weilu Gao, Qi Zhang, Lei Ren, and Junichiro Kono "Carbon-based terahertz devices", Proc. SPIE 9476, Automatic Target Recognition XXV, 947612 (28 May 2015); https://doi.org/10.1117/12.2185159

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