An advanced three-dimensional (3-D) self-assembling technique of surface mi
cro-machined polysilicon structures is presented here for the realization o
f dedicated actuators for optical applications such as micro-mirrors array
with large deflection angles. Three-dimensional polysilicon microparts are
self-assembled by beam buckling induced by integrated scratch drive actuato
rs (SDAs), With this technique, 380 x 250 mum(2) microplates were lifted 90
mum above the substrate plane. Once the assembling is performed, the 3-D s
hapes were held permanently by an integrated mechanical lock. Subsequent to
the 3-D assembling, micro-mirrors were successfully actuated by biasing bu
ried electrodes. Controlled motion up to +/- 15 degrees rotation was measur
ed and analyzed by means of analytical models. Long-term actuations were ca
rried out without any observable change, even for 0.5-mum thin polysilicon
structures. This self-assembling technique of 3-D devices from surface micr
o-machining opens new integration capabilities and new applications for mic
ro-opto-electro-mechanical system (MOEMS).