## Abstract

In this work we consider lateral current pumped GaAs/AlGaAs quantum wells as sources of incoherent terahertz radiation. The lateral field heats the electrons in a two-dimensional quantum layer and increases the population of higher subbands, hence also increasing the radiation power generated in spontaneous intersubband emission processes. Digitally graded quasi-parabolic and simple square quantum wells are considered, and the advantages of both types are discussed. Calculations at lattice temperatures of 77 K and 300 K, for electric fields up to 10 kV / cm, show that the optical output power of ∼100-200 W/ m2 may be achieved for the 7 THz source. The main peak of the spectrum, at 7 THz, of the quasi-parabolic quantum well exceeds the black body radiation at 300 K by approximately a factor of two and by two orders of magnitude at 77 K.

Original language | English |
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Article number | 073715 |

Journal | Journal of Applied Physics |

Volume | 102 |

Issue number | 7 |

DOIs | |

Publication status | Published - 1 Oct 2007 |

Externally published | Yes |