Terahertz generation in nitrides due to transit-time resonance assisted by optical phonon emission

Starikov, E.; Shiktorov, P.; Gruz̆inskis, V.; Varani, L.; Palermo, C.; Millithaler, J.‐F.; Reggiani, L.

doi:10.1088/0953-8984/20/38/384209

Cited by 24 publications

(16 citation statements)

References 47 publications

(127 reference statements)

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“…Transit time resonance assisted by optical phonon emission in wide bandgap semiconductors and related plasma instabilities are another alternative, predicted by theory and confirmed by simulations [5,6]. A recently developed planar asymmetric nonlinear nanodevice, called self-switching diode (SSD), is also a promising candidate to operate in the THz range [7], as we will illustrate in this work.…”

mentioning

confidence: 88%

Enhanced Terahertz detection in self‐switching diodes

Íñiguez-de-la-Torre

Matéos

Pardo

et al. 2009

Int J Numerical Modelling

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SUMMARYIn this work, by means of Monte Carlo simulations, we analyze the presence of a resonance in the DC current response of an asymmetric nonlinear nanodiode (called self-switching diode) to AC voltage excitations in the Terahertz range. The phenomenon, which takes place at room temperature, can be enhanced and tuned by the geometry of the device, being potentially useful for selective Terahertz detection. The resonance is linked to a noise mechanism: collective charge fluctuations in the space-charge region around the active channel of the device, which are visible both in noise and rectification. The enhancement of the DC current is attributed to the phase shift between the applied signal and the response of the charge around the channel near the vertical trenches, which controls the electron flow through the diode.

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confidence: 88%

Enhanced Terahertz detection in self‐switching diodes

Íñiguez-de-la-Torre

Matéos

Pardo

et al. 2009

Int J Numerical Modelling

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“…The latter feature has been in focus of previous studies. 6,8,9,11 At Q = 0, drift of the electrons is revealed: the characteristic feature arises…”

Section: B Solutions For the Space And Time Dependent Problemmentioning

confidence: 99%

“…The OPTTR induces a number of interesting effects (for review see Refs. 8,9). The most important manifestation of this phenomenon is the possibility of microwave amplification and generation in the sub-THz and THz frequency regions.…”

Section: Introductionmentioning

confidence: 99%

Wave excitations of drifting two-dimensional electron gas under strong inelastic scattering

Korotyeyev¹,

Kochelap²,

Varani

2012

Journal of Applied Physics

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We have analyzed low-temperature behavior of two-dimensional electron gas in polar heterostructures subjected to a high electric field. When the optical phonon emission is the fastest relaxation process, we have found existence of collective wave-like excitations of the electrons. These wave-like excitations are periodic in time oscillations of the electrons in both real and momentum spaces. The excitation spectra are of multi-branch character with considerable spatial dispersion. There are one acoustic-type and a number of optical-type branches of the spectra. Their small damping is caused by quasi-elastic scattering of the electrons and formation of relevant space charge. Also there exist waves with zero frequency and finite spatial periods -the standing waves. The found excitations of the electron gas can be interpreted as synchronous in time and real space manifestation of well-known optical-phonon-transient-time-resonance. Estimates of parameters of the excitations for two polar heterostructures, GaN/AlGaN and ZnO/MgZnO, have shown that excitation frequencies are in THz-frequency range, while standing wave periods are in sub-micrometer region.

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“…Moreover, a system able to measure the transmission of THz radiations through different types of passive and active samples would be of a great benefit for the development of THz detectors and emitters. For instance, in the latter case, the sample may act as an active medium for the laser/maser structures . Since the metal contacts may also play an important role in the THz radiation transmission of the sample, their effect must be taken into account.…”

Section: Introductionmentioning

confidence: 99%