Near-field imaging of the interactions of evanescent fields.

The near-field images of interferences generated by the reflection or by the interactions of four evanescent fields of two different wavelengths are obtained. The near-field interactions of the evanescent fields are studied.

Imaging near-field transverse modes of vertical-cavity surface-emitting lasers by near-field scanning optical microscopy.

We have characterized the oxide-confined vertical-cavity surface-emitting laser (VCSEL) using short-tip, tapping-mode tuning fork near-field scanning optical microscopy (TMTF-NSOM). The near-field radiation patterns of the VCSEL were measured. By comparing the topographic and optical images, we attribute the asymmetric transverse modes to the geometric defect outside the oxide aperture. We also performed spatially resolved spectroscopic imaging over the surface of the VCSEL by coupling NSOM to a spectrometer.