Short-Wavelength (λ ≈ 3.6 μm) In0.73Ga0.
✦ LIBER ✦
Quantum cascade laser design based on impurity–band transitions of donors in Si/GeSi(1 1 1) heterostructures
✍ Scribed by N.A. Bekin; S.G. Pavlov
- Book ID
- 104081344
- Publisher
- Elsevier Science
- Year
- 2009
- Tongue
- English
- Weight
- 163 KB
- Volume
- 404
- Category
- Article
- ISSN
- 0921-4526
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✦ Synopsis
The possibility of amplification of terahertz radiation due to optical transitions between a twodimensional state continuum (2D) and shallow-level donor states in Si/GeSi(111) superlattices with selectively d-doped quantum wells is analyzed theoretically. The mechanism of population inversion is based on fast ionization of donor centers by phonon-assisted tunneling into continuum of a lower subband in the neighboring quantum well. The fast tunneling is caused by hybridization of the impurity ground state and a 2D state continuum in the neighboring quantum well. It is shown that for the donor concentration of 5 Â 10 11 cm À2 per period the terahertz gain can be as high as 10 cm À1 in the wavelength range of 29-45 mm (6.5-10.2 THz).
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