THz plasma wave instability in field effect transistor with electron diffusion current density

Abstract

The plasma wave instability in rectangle field effect transistors (FETs) is studied with electron diffusion current density by quantum hydrodynamic model in this paper. General dispersion relation including effects of electrical thermal motion, external friction associated with electron scattering effect, electron exchange-correlation contributions and quantum effects were obtained for rectangle FETs. The electron diffusion current density term is considered for further analysis in this paper. It is found that the quantum effects, the electron diffusion current density and electrical thermal motion enhance the radiation power and frequencies. But the electron exchangecorrelation effects and the electron scattering effects reduce the radiation power and frequencies. Results showed that a transistor has advantages for the realization of practical terahertz sources.

Theoretical Investigation of a Highly Sensitive Refractive-Index Sensor Based on TM0 Waveguide Mode Resonance Excited in an Asymmetric Metal-Cladding Dielectric Waveguide Structure

“…Surface plasmon resonance (SPR) can generate a strong electromagnetic field enhancement on the surface of a metal structure, and is very sensitive to the surrounding environment. Therefore, SPR can be applied to numerous fields such as absorption enhancement [ 1 , 2 ], magnetic field enhancement [ 3 , 4 ], photocatalysis [ 5 , 6 , 7 , 8 , 9 , 10 ], THz oscillation [ 11 , 12 , 13 ], Fano resonance [ 14 , 15 , 16 , 17 ], surface-enhanced Raman scattering (SERS) [ 18 , 19 , 20 , 21 ], sub-wavelength lithography [ 22 , 23 ], and refractive index (RI) sensors [ 24 , 25 , 26 , 27 , 28 , 29 ]. For refractive index sensors based on SPR, the resonance is excited mainly in two modes, the angular mode (at fixed wavelength) and the spectral mode (at fixed angle) [ 30 , 31 ].…”

Tunable Plasmonic Band-Pass Filter Using Five Circular Ring Resonators.

“…Surface plasmon resonance (SPR) can generate a strong electromagnetic eld enhancement on the surface of a metal structure, and is very sensitive to the surrounding environment. Therefore, SPR can be applied to numerous elds such as absorption enhancement [1,2], magnetic eld enhancement [3,4], photocatalysis [5][6][7][8][9][10], THz oscillation [11][12][13], Fano resonance [14][15][16][17], surface -enhanced Raman scattering (SERS) [18][19][20][21], sub-wavelength lithography [22,23], and refractive index (RI) sensors [24][25][26][27][28][29]. For refractive index sensors based on SPR, the resonance is excited mainly in two modes, the angular mode (at xed wavelength) and the spectral mode (at xed angle) [30,31].…”

Investigation of a very sensitive refractive index sensor based on waveguide TM mode resonance and design of a plasmonic sensor.

“…Surface plasmon resonance (SPR) can generate a strong electromagnetic eld enhancement on the surface of a metal structure, and is very sensitive to the surrounding environment. Therefore, SPR can be applied to numerous elds such as absorption enhancement [1,2], magnetic eld enhancement [3,4], photocatalysis [5][6][7][8][9][10], THz oscillation [11][12][13], Fano resonance [14][15][16][17], surface enhanced Raman scattering (SERS) [18][19][20][21], sub-wavelength lithography [22,23], and refractive index (RI) sensors [24][25][26][27][28][29].…”