Controlling the mechanical, electrical, magnetic, and optical properties
of materials by advanced fabrication methods (Le.; Molecular Beam
Epitaxy and Metal-Organic Chemical Vapor Deposition) has become the new
paradigm in our research era. Sensors, being the most vital part of the
electronic data processing and decision making machines, stand to gain
the most from engineering of the properties of materials.
Microfabrication technology has already contributed significantly to the
batch fabrication of micro-sensors with higher over all qualities
compared to their counterparts that are fabricated using other methods.
Batch fabrication of micro-sensors i) results in more uniform properties
of co-fabricated devices, ii) nearly eliminates the need for
characterization of individual sensors, and iii) eliminates a need for
laborious alignment procedures. A less obvious benefit of using
microfabrication methods is the possibility of precise control over the
dimensions of the sensor. This control enables engineering of some of
the properties of the material which affect the sensor's operation.
There are many examples of this in the literature. Optical sensors are
known to have superior properties over their counterparts that use other
(i. e.; electrostatic and magnetic) means of detection. To name a few,
these advantages are: i) immunity to electromagnetic interferences, ii)
higher sensitivities compared to the other types of sensors, iii)
simplicity of operation principles, and iv) simplicity of overall
construction.