Excitation, detection, and electrostatic manipulation of terahertz-frequency range plasmons in a two-dimensional electron system

Jingbo Wu; Alexander S. Mayorov; Christopher D. Wood; Divyang Mistry; Lianhe Li; Wilson Muchenje; Mark C. Rosamond; Li Chen; Edmund H. Linfield; A. Giles Davies; John E. Cunningham

arXiv · 1506.07585

Excitation, detection, and electrostatic manipulation of terahertz-frequency range plasmons in a two-dimensional electron system

Jingbo Wu·Alexander S. Mayorov·Christopher D. Wood·Divyang Mistry·Lianhe Li·Wilson Muchenje·Mark C. Rosamond·Li Chen·Edmund H. Linfield·A. Giles Davies·John E. Cunningham

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Abstract

Terahertz time domain spectroscopy employing free-space radiation has frequently been used to probe the elementary excitations of low-dimensional systems. The diffraction limit blocks its use for the in-plane study of individual laterally defined nanostructures, however. Here, we demonstrate a planar terahertz-frequency plasmonic circuit in which photoconductive material is monolithically integrated with a two-dimensional electron system. Plasmons with a broad spectral range (up to ~400 GHz) are excited by injecting picosecond-duration pulses, generated and detected by a photoconductive semiconductor, into a high mobility two-dimensional electron system. Using voltage modulation of a Schottky gate overlying the two-dimensional electron system, we form a tuneable plasmonic cavity, and observe electrostatic manipulation of the plasmon resonances. Our technique offers a direct route to access the picosecond dynamics of confined transport in a broad range of lateral nanostructures.

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Jingbo Wu, Alexander S. Mayorov, Christopher D. Wood, Divyang Mistry, Lianhe Li, Wilson Muchenje, Mark C. Rosamond, Li Chen, Edmund H. Linfield, A. Giles Davies, John E. Cunningham. 2015-06-25. Excitation, detection, and electrostatic manipulation of terahertz-frequency range plasmons in a two-dimensional electron system. https://arxiv.org/abs/1506.07585

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