Abstract
We report on both experiments and theory of low-terahertz frequency range (up to 400 GHz) magnetoplasmons in a gated two-dimensional electron gas at low (<4K) temperatures. The evolution of magnetoplasmon resonances was observed as a function of magnetic field at frequencies up to ∼400 GHz. Full-wave 3D simulations of the system predicted the spatial distribution of plasmon modes in the 2D channel, along with their frequency response, allowing us to distinguish those resonances caused by bulk and edge magnetoplasmons in the experiments. Our methodology is anticipated to be applicable to the low temperature (<4K) on-chip terahertz measurements of a wide range of other low-dimensional mesoscopic systems.
Highlights
The terahertz (THz) frequency plasmonic response of mesoscopic systems is of increasing interest for a wide range of potential device applications, including amplitude and phase modulators [1,2], emitters [3], amplifiers [4], and detectors [5]
Dean et al demonstrated apertureless THz near-field imaging using a quantum cascade laser source, allowing coherent, high-resolution imaging of such structures at room temperature [7], while Mitrofanov et al showed that scanned aperture THz near-field microscopy can reveal surface waves excited at the edges of graphene structures [8]
THz pulses were generated by laser pulse excitation of PC switch S1, which was biased at 10 V dc and coupled into the coplanar waveguide (CPW)
Summary
The terahertz (THz) frequency plasmonic response of mesoscopic systems (with length scales ranging from 100s of nanometers to a few microns) is of increasing interest for a wide range of potential device applications, including amplitude and phase modulators [1,2], emitters [3], amplifiers [4], and detectors [5].
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