Waveguide E†ect on the Image Formation Process in Near-Ðeld Photocurrent Spectroscopy of Semiconductor Laser Diodes
نویسندگان
چکیده
Near-Ðeld photocurrent spectra of high-power laser diode arrays with di†erent wave-guide characteristics are reported. Subwavelength spatial resolution is achieved by using a near-Ðeld Ðbre probe as the excitation source. The e†ect of the laser diode waveguide structure and of surface recombination processes on the near-Ðeld photocurrent image formation is discussed and analysed in terms of a beam propagation model. Experiments on laser diodes before and after accelerated ageing demonstrate the potential of the technique for analysing microscopic defect formation processes in optoelectronic devices. 1997 by John Wiley & Sons, Ltd. (
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