Fluid-based switches and a method for producing the same are disclosed. In
one embodiment, a switch is provided with first and second mated
substrates that define therebetween at least portions of a number of
cavities. A plurality of wettable pads is exposed within one or more of
the cavities. A switching fluid is held within one or more of the
cavities, and is wetted to the wettable pads. The switching fluid serves
to open and block light paths through one or more of the cavities, in
response to forces that are applied to the switching fluid. Forces are
applied to the switching fluid by an actuating fluid that is held within
one or more of the cavities. At least a portion of the switching fluid is
coated with a surface tension modifier.
