Eur. Phys. J. AP
Volume 5, Number 3, March 1999
|Page(s)||269 - 275|
|Published online||15 March 1999|
Imaging a GaAlAs laser diode in operation using apertureless scanning near-field optical microscopy*
Laboratoire de Nanotechnologie et d'Instrumentation Optique, Université de Technologie
12 rue Marie Curie, B.P. 2060, 10010 Troyes Cedex, France
Corresponding author: firstname.lastname@example.org
Accepted: 13 October 1998
Published online: 15 March 1999
We report the local study of an operating double hetero-junction GaAs/GaAlAs laser diode by apertureless Scanning Near-field Optical Microscopy (SNOM). This study allows the characterization of the spatial properties of the light emitted by the laser source. The optical probe used is a tungsten tip vibrating (at frequency f) perpendicularly to the emitting surface. Suitable experimental parameters permitting us to accede to near-field information have been defined. This has leaded to an experimental configuration in which the probe vibration amplitude is "optimal". A far-field detection at grazing angle is used and a second harmonic (at frequency 2f) lock-in detection is performed. This configuration has permitted us to obtain SNOM images in stimulated emission as well as in spontaneous emission. Above the threshold current, information concerning the emitted laser mode are obtained, whereas in spontaneous emission the SNOM images are linked to the index contrast of the laser diode front facet.
PACS: 61.16.Ch – Scanning probe microscopy: scanning tunneling, atomic force, scanning optical, magnetic force, etc. / 42.30.Va – Image forming and processing / 42.55.Px – Semiconductor lasers; laser diodes
© EDP Sciences, 1999
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