GaAs microdisk laser structures with modified resonator geometry have been
investigated. Device fabrication employs electron-beam lithography and etch
procedures for generating disks with notches, projections, and holes, and
a novel ring-laser structure. Directional emission from the notched microdi
sk lasers has been investigated using external scattering structures, which
may also be used as couplers for the laser emission. (C) 1998 American Vac
uum Society. [S0734-211X(98)04306-6].