Geometric effects in the Dyakonov-Shur theory of Teraherz photodetection
arXiv:2501.09696 · doi:10.1103/8p4y-jp7q
Abstract
Nonlinear resonances of plasma waves in field-effect transitors enable a well-known photodetection mechanism, first introduced by Dyakonov and Shur in the Nineties, especially suited to the Terahertz (THz) frequency range. Theoretical analyses of the mechanism always assume that the gate of the transistor, which is coupled to the antenna receiving the THz signal, is as long as the channel itself, at odds with typical experimental devices, where short gates are usually employed, e.g. due to fabrication constraints. In this work we overcome this limitation and provide a complete theory of Dyakonov--Shur photodetection in the presence of short gates. We develop our theory in such a general fashion that allows us to also treat the case in which multiple gates are present. We find that a sub-optimal positioning of the gates can substantially decrease the detection efficiency of the device and provide a compact analytical formula to quickly estimate the optimal gate position.
References in corpus (35)
- Graphene field effect transistors as room-temperature Terahertz detectors
- Negative local resistance caused by viscous electron backflow in graphene
- Observation of the Dirac fluid and the breakdown of the Wiedemann-Franz law in graphene
- Superballistic flow of viscous electron fluid through graphene constrictions
- Electron Viscosity, Current Vortices and Negative Nonlocal Resistance in Graphene
- Quantum critical transport in clean graphene
- Imaging viscous flow of the Dirac fluid in graphene
- Resonant Terahertz Detection Using Graphene Plasmons
- Measuring Hall Viscosity of Graphene's Electron Fluid
- Interaction phenomena in graphene seen through quantum capacitance
- Visualizing Poiseuille flow of hydrodynamic electrons
- Non-local transport and the hydrodynamic shear viscosity in graphene
- Higher-Than-Ballistic Conduction of Viscous Electron Flows
- Field Effect Transistors for Terahertz Detection: Physics and First Imaging Applications
- High performance bilayer-graphene Terahertz detectors
- Hydrodynamics in graphene: Linear-response transport
- Bulk and shear viscosities of the 2D electron liquid in a doped graphene sheet
- Hydrodynamic model for electron-hole plasma in graphene
- Viscous electron fluids
- Hydrodynamic approach to electronic transport in graphene
- Scanning Gate Microscopy in a Viscous Electron Fluid
- Theory of the plasma-wave photoresponse of a gated graphene sheet
- Dual Origin of Room Temperature Sub-Terahertz Photoresponse in Graphene Field Effect Transistors
- Hydrodynamic approach to two-dimensional electron systems
- Geometric control of universal hydrodynamic flow in a two dimensional electron fluid
- Finite temperature inelastic mean free path and quasiparticle lifetime in graphene
- Imaging Hydrodynamic Electrons Flowing Without Landauer-Sharvin Resistance
- Tomographic Dynamics and Scale-Dependent Viscosity in Two-Dimensional Electron Systems
- Boundary instability of a two-dimensional plasma
- Particle Collisions and Negative Nonlocal Response of Ballistic Electrons
- Terahertz detection with graphene FETs: photothermoelectric and resistive self-mixing contributions to the detector response
- Hydrodynamic charge transport in GaAs/AlGaAs ultrahigh-mobility two-dimensional electron gas
- Superballistic electron flow through a point contact in a Ga[Al]As heterostructure
- Optimal asymmetry of transistor-based terahertz detectors
- Microscopic theory of plasmon-enabled resonant terahertz detection in bilayer graphene