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(Color) (a) Diagram indicating the excitation site, region of field modulation, and observed NW end. At right, superimposed PL image (recorded below laser threshold) and white-light optical micrograph of a representative CdS NW EOM-laser device. Numerals 1 and 2 indicate excitation site and observed NW end, respectively. Scale bar, . (b) Emission spectra of a CdS NW laser showing effect of a signal. (c) Modulation vs at the two indicated wavelengths for the EOM-laser in (b). Error bars reflect the standard deviation of the responses to 50 square-wave pulses at .
(Color) (a) GaN NW emission spectrum above lasing threshold, with and without bias applied. Insets, recorded below threshold: top, superimposed PL and white-light image of device; scale bar is . Bottom, end emission spectra at three different bias values. (b) vs , below threshold. For this device, , . All data were recorded at room temperature.
(Color) (a) Two schemes used to apply electric fields. (b) Length-normalized modulation for representative parallel-plate (PP) and fringe-field (FF) devices. PP: “A,” , , ; “B,” , , ; “C,” , , ; “D,” , , . FF: , , . Note that a positive field corresponds to .
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