A Layered Response

+ See all authors and affiliations

Science  10 Aug 2007:
Vol. 317, Issue 5839, pp. 717b
DOI: 10.1126/science.317.5839.717b

Actuators convert energy into mechanical force, and Masmadinis et al. (p. 780; see the Perspective by Blencowe) present a method for the actuation of nanomechanical resonators based on piezoelectric semiconductors, in this case, cantilevers of epitaxially grown GaAs that form a pin diode (an intrinsic layer, which is charge-depleted and an active piezoelectric material, sandwiched between p-type and n-type layers). The strength of the mechanical resonance induced by an applied ac voltage can be controlled by a dc bias, which alters the charge-depleted layer. The actuation can be tailored by altering the device's band structure, geometry, and crystallographic direction.

Related Content

Navigate This Article