Strong photo-absorption by a single quantum wire in   waveguide-transmission spectroscopy
  We measured the absorption spectrum of a single T-shaped, 14x6 nm lateral-sized quantum wire embedded in an optical waveguide using waveguide-transmission spectroscopy at 5 K. In spite of its small volume, the one-dimensional-exciton ground state shows a large absorption coefficient of 80 /cm, or a 98 % absorption probability for a single pass of the 500-um-long waveguide. 
Yasushi Takahashi, Yuhei Hayamizu, Hirotake Itoh, Masahiro Yoshita,   Hidefumi Akiyama, Loren N. Pfeiffer, Ken W. West