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Electronic temperatures of terahertz quantum cascade active regions with phonon scattering assisted injection and extraction scheme (Articolo in rivista)

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Electronic temperatures of terahertz quantum cascade active regions with phonon scattering assisted injection and extraction scheme (Articolo in rivista) (literal)

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Patimisco P. [ 1,2,3 ] ; Scamarcio G. [ 1,2,3 ] ; Santacroce M. V. [ 1,2,3 ] ; Spagnolo V. [ 1,2,3 ] ; Vitiello M. S. [ 4,5,6 ] ; Dupont E. [ 7 ] ; Laframboise S. R. [ 7 ] ; Fathololoumi S. [ 7 ] ; Razavipour G. S. [ 8 ] ; Wasilewski Z. [ 7,8 ] (2013)
Electronic temperatures of terahertz quantum cascade active regions with phonon scattering assisted injection and extraction scheme
in Optics express; Optical Society of America, Washington (Stati Uniti d'America)
(literal)

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Patimisco P. [ 1,2,3 ] ; Scamarcio G. [ 1,2,3 ] ; Santacroce M. V. [ 1,2,3 ] ; Spagnolo V. [ 1,2,3 ] ; Vitiello M. S. [ 4,5,6 ] ; Dupont E. [ 7 ] ; Laframboise S. R. [ 7 ] ; Fathololoumi S. [ 7 ] ; Razavipour G. S. [ 8 ] ; Wasilewski Z. [ 7,8 ] (literal)

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[ 1 ] Univ Bari Aldo Moro, Dipartimento Interateneo Fis, I-70126 Bari, Italy [ 2 ] Politecn Bari, I-70126 Bari, Italy [ 3 ] UOS Bari, Ist Foton & Nanotecnol, CNR, I-70126 Bari, Italy [ 4 ] CNR, NEST, Ist Nanosci, I-56127 Pisa, Italy [ 5 ] Scuola Normale Super Pisa, I-56127 Pisa, Italy [ 6 ] CNR, Dipartimento Sci Fis & Tecnol Mat, I-50125 Florence, Italy [ 7 ] Natl Res Council Canada, Ottawa, ON, Canada [ 8 ] Univ Waterloo, Dept Elect & Comp Engn, Waterloo Inst Nanotechnol, Waterloo, ON N2L 3G1, Canada (literal)

Titolo

Electronic temperatures of terahertz quantum cascade active regions with phonon scattering assisted injection and extraction scheme (literal)

Abstract

We measured the lattice and subband electronic temperatures of terahertz quantum cascade devices based on the optical phonon-scattering assisted active region scheme. While the electronic temperature of the injector state (j = 4) significantly increases by Delta T = T-e(4) - T-L similar to 40 K, in analogy with the reported values in resonant phonon scheme (Delta T similar to 70-110 K), both the laser levels (j = 2,3) remain much colder with respect to the latter (by a factor of 3-5) and share the same electronic temperature of the ground level (j = 1). The electronic population ratio n(2)/n(1) shows that the optical phonon scattering efficiently depopulates the lower laser level (j = 2) up to an electronic temperature T-e similar to 180 K. (literal)

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