Broadband terahertz modulation in electrostatically-doped artificial trilayer graphene

Ioannis Chatzakis, Zhen Li, Alexander V. Benderskii, Stephen B. Cronin

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

We report a terahertz optical modulator consisting of randomly stacked trilayer graphene (TLG) deposited on an oxidized silicon substrate by means of THz-Time Domain Spectroscopy (THz-TDS). Here, the gate tuning of the Fermi level of the TLG provides the fundamental basis for the modulation of THz transmission. We measured a 15% change in the THz transmission of this device over a broad frequency range (0.6-1.6 THz). We also observed a strong absorption >80% in the time-domain signals and a frequency independence of the conductivity. Furthermore, unlike previous studies, we find that the underlying silicon substrate, which serves as a gate electrode for the graphene, also exhibits substantial modulation of the transmitted THz radiation under applied voltage biases.

Original languageEnglish
Pages (from-to)1721-1726
Number of pages6
JournalNanoscale
Volume9
Issue number4
DOIs
StatePublished - Jan 28 2017

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