Publication

Terahertz Electronic Metadevices: Principles behind the Ultra-high Cutoff Frequency

2025

Abstract

The propagation of different slow-wave modes in the metal-insulator-2DEG (Mi2DEG) structures-a process unique to electronic metadevices-induces a pronounced current confinement within the device's active region. This confinement significantly enhances the device's modulation capability, resulting in a substantial increase in the cutoff frequency. Here, we elucidate this phenomenon through numerical simulations and validate experimentally across a broad frequency range, from near DC to THz. Metadevices fabricated on InAlN/GaN on SiC exhibited ultra-low contact and total resistances, reaching 30 Ωµm and 100 Ωµm, respectively. As a result, a tenfold increase in the device cutoff frequency, approaching 20 THz, was achieved along with a high on-off ratio above 10 at 0.75 THz. This work advances the fundamental understanding of the physical processes in electronic metadevices, paving the way for future THz electronic technologies.

Official source

https://infoscience.epfl.ch/entities/publication/b7492162-0922-4b5e-8af3-340dadc65e94

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2025

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/b7492162-0922-4b5e-8af3-340dadc65e94

About this result

Related concepts (32)

Filter (signal processing)

In signal processing, a filter is a device or process that removes some unwanted components or features from a signal. Filtering is a class of signal processing, the defining feature of filters being the complete or partial suppression of some aspect of the signal. Most often, this means removing some frequencies or frequency bands. However, filters do not exclusively act in the frequency domain; especially in the field of many other targets for filtering exist.

Cutoff frequency

In physics and electrical engineering, a cutoff frequency, corner frequency, or break frequency is a boundary in a system's frequency response at which energy flowing through the system begins to be reduced (attenuated or reflected) rather than passing through. Typically in electronic systems such as filters and communication channels, cutoff frequency applies to an edge in a lowpass, highpass, bandpass, or band-stop characteristic – a frequency characterizing a boundary between a passband and a stopband.

Frequency

Frequency (symbol f) is the number of occurrences of a repeating event per unit of time. It is also occasionally referred to as temporal frequency for clarity and to distinguish it from spatial frequency. Frequency is measured in hertz (symbol Hz) which is equal to one event per second. Ordinary frequency is related to angular frequency (symbol ω, in radians per second) by a scaling factor of 2π. The period (symbol T) is the interval of time between events, so the period is the reciprocal of the frequency, f=1/T.

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Terahertz Electronic Metadevices: Principles behind the Ultra-high Cutoff Frequency

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