Strong photoabsorption by a single-quantum wire in waveguide-transmission spectroscopy

Takahashi, Yasushi; Hayamizu, Yuhei; Itoh, Hirotake; Yoshita, Masahiro; Akiyama, Hidefumi; Pfeiffer, Loren N.; West, Ken W.
June 2005
Applied Physics Letters;6/13/2005, Vol. 86 Issue 24, p243101
Academic Journal
We measured the absorption spectrum of a single T-shaped 14×6 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-1, or a 98% absorption probability for a single pass of the 500 μm long waveguide.


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