Plasmon Excitation and Plasmonic Detection of Terahertz Radiation in the Grating-Gate Field-Effect-Transistor Structures

Abstract

Physics of plasma oscillations and basic principles of plasmonic detection of terahertz radiation in the grating-gate transistor structures with two-dimensional electron channels are considered. It is shown that the grating-gate-transistor plasmonic detectors can be efficiently coupled to terahertz radiation. Plasmonic detection response considerably increases if the electron density in the grating-gate transistor structure is spatially modulated.

Noncentrosymmetric plasmon modes and giant terahertz photocurrent in a two-dimensional plasmonic crystal

“…For definiteness, we limit ourselves to studying the screened plasmon resonances excited at low THz frequencies. The dispersion relation for plasmons in the 2D electron system screened by a perfectly conductive plane is [20] …”

“…Although the surface-plasmon polaritons in metals are excited in visible and near-infrared frequency ranges, the frequencies of the plasmons in 2D electron systems [20], including graphene [21], fall into the terahertz (THz) range. In contrast to the surface-plasmon polaritons in metals, the wavelength of the plasmons in the 2D electron systems is much shorter (by two and even three orders of magnitude) than the wavelength of electromagnetic radiation of the same frequency.…”

“…In contrast to the surface-plasmon polaritons in metals, the wavelength of the plasmons in the 2D electron systems is much shorter (by two and even three orders of magnitude) than the wavelength of electromagnetic radiation of the same frequency. Therefore, the THz radiation can be coupled to the 2D plasmons by using the grating coupler with a (sub)micron period [20,22,23]. The two-dimensional electron system with a periodic grating can be viewed as a 2D plasmonic crystal (2D-PlCr) since, in such a system, the electromagnetic near field has a plasmonic nature and its wavelength is determined by the periodicity of the grating.…”

Magnetic-field tunable THz detectors based on GaAs/AlGaAs and CdTe/CdMgTe quantum wells

“…A numerical analysis which was carried out for grid-gated samples similar to these considered experimentally in this work shows that one can expect excitation of plasmons with a frequency which is intermediate between the gated and ungated cases. 26 Thus, we assume that when a grid-gated samples is excited, the effective dielectric function which enters the dispersion relation, can be approximated as a weighted average of the dielectric functions for the gated and ungated cases:…”

Гигантский Эффект Выпрямления Терагерцового Излучения В Периодических Графеновых Плазмонных Структурах

“…В последнее время активно иссле-дуется плазмонное детектирование ТГц излучения в 2D электронных системах с решеточным затвором [11]. Плазмонное детектирование в полупроводниковых ге-тероструктурах с 2D электронными системами связано с эффектами увлечения носителей заряда плазмона-ми и плазмонного храповика [12].…”