Collision dominated, ballistic, and viscous regimes of terahertz plasmonic detection by graphene

TL;DR

This paper investigates the different operating regimes of graphene plasmonic FETs for terahertz detection, highlighting the roles of collision, ballistic, and viscous effects in their response times and sensitivities.

Contribution

It maps the operating regimes of graphene plasmonic FETs, emphasizing the importance of viscous effects and providing insights into their detection capabilities.

Findings

Graphene FETs have detection sensitivities comparable to other materials.

Response time is very short, enabling rapid detection.

Operating regimes depend on viscosity and channel length, affecting resonance and response.

Abstract

The terahertz detection performance and operating regimes of graphene plasmonic field-effect transistors (FETs) were investigated by a hydrodynamic model. Continuous wave detection simulations showed that the graphene response sensitivity is similar to that of other materials including Si, InGaAs, GaN, and diamond-based FETs. However, the pulse detection results indicated a very short response time, which favors the rapid/high-sensitively detection. The analysis on the mobility dependence of the response time revealed the same detection regimes as the traditional semiconductor materials, i.e. the non-resonant (collision dominated) regime, the resonant ballistic regime, and the viscous regime. When the kinematic viscosity ({\nu}) is above a certain critical viscosity value, {\nu}NR, the plasmonic FETs always operates in the viscous non-resonant regime regardless of channel length (L). In this regime, the response time rises monotonically with the increase of L. When {\nu} < {\nu}NR, the plasmonic resonance can be reached in a certain range of L (i.e. the resonant window). Within this window, the carrier transport is ballistic. For a sufficiently short channel, the graphene devices would always operate in the non-resonant regime regardless of the field-effect mobility, corresponding to another viscous regime. The above work mapped the operating regimes of graphene plasmonic FETs, and demonstrated the significance of the viscous effects for the graphene plasmonic detection. These results could be used for the extraction of the temperature dependences of viscosity in graphene.