Waveguide interaction between light and an amplified space-charge wave

Sannikov, D. G.; Семенцов, Д. И.

doi:10.1134/s1063783407030171

Cited by 6 publications

(2 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The amplification of traveling space charge waves (SCWs) of the microwave range in n-GaAs films has been under investigations for many years [1][2][3][4][5][6]. When propagating in bias electric fields higher than the critical value for observing negative differential conductivity (NDC), SCWs are subject to amplification.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, the frequency range of amplification of SCWs in GaAs films is f < 50 GHz, see Figure 1. At the frequencies f > 50 GHz, it is better to use new materials possessing NDC at higher frequencies f = 100 ••• 500 GHz, like gallium nitride GaN [7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23]. The attracting properties of GaN are: a high critical bias field E c ~ 100 kV/cm; the extended frequency range for observing NDC f  500 GHz; high temperature stability; NDC at high doping levels n 0 ~ 10 17 ••• 10 18 cm -3 .…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Influence of Nonlocality on Amplification of Space Charge Waves in n-GaN Films

Grimalsky¹,

Koshevaya²,

Tecpoyotl-T.³

et al. 2011

JEMAA

View full text Add to dashboard Cite

It is investigated theoretically the amplification of space charge waves (SCWs) due to the negative differential conduc-tivity (NDC) in n-GaN films of submicron thicknesses placed onto a semi-infinite substrate. The influence of the nonlo-cal dependence of the average electron velocity on the electron energy is considered. The simplest nonlocal model is used where the total electron concentration is taken into account. The relaxation momentum and energy frequencies have been calculated. The influence of the nonlocality on NDC results in the decrease of the absolute value of its real part and appearance of the imaginary part. The calculation of the diffusion coefficient leads to essential errors. The simulations of spatial increments of the amplification of SCWs demonstrate that the nonlocality is essential at the fre-quencies f ? 150 GHz, and the amplification is possible up till the frequencies f ? 400 ??? 500 GHz

show abstract