Abstract
Graphene Field-effect transistors (GFETs) are excellent candidates for all-electric, low-power radiation sources and detectors based on integrated circuit technology. In this work, we show that a hydrodynamic instability can be ex¬plored (the Dyakonov–Shur instability) to excite the graphene plasmons. The instability can be sustained with the help of a source-to-drain current and con¬trolled with the gate voltage. It is shown that the plasmons radiate a frequency comb in the Terahertz (THz) range. It is argued how this can pave the stage for a new generation of low power THz sources in integrated-circuit technology.
Highlights
Terahertz radiation has numerous applications ranging from sensing and imaging to metrology and spectroscopy [1, 2]; in particular terahertz laser (THL) combs play a prominent role within such technology [3, 4]
With the advent of graphene plasmonics, new techniques relying in optical pumping have been put forward [5, 6]
We exploit a scheme for the generation of coherent THz frequency combs in graphene field-effect transistors, arising from the Dyakonov–Shur (DS) plasmonic instability [8, 9]
Summary
Terahertz radiation has numerous applications ranging from sensing and imaging to metrology and spectroscopy [1, 2]; in particular terahertz laser (THL) combs play a prominent role within such technology [3, 4]. The progress in graphene based transistors [7] paved the way to the possibility for all-electrical miniaturised devices for low power radiation emission and detection. We exploit a scheme for the generation of coherent THz frequency combs in graphene field-effect transistors, arising from the Dyakonov–Shur (DS) plasmonic instability [8, 9]. The latter can be excited via the injection of an electric current, forgoing the necessity of optical pumping. This opens the possibility to the development of an all-electric, low-consumption stimulated THL, capable of operating at room temperature
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