
Since a phase shift of 1=3 period is needed between successive frames, the
minimum T
0
for an SLM is three pixels wide. Obviously, a sine wave is not
precisely represented by so few pixels. The alternatives include (1) increasing b,
since this is equivalent to narrowing T
0
in terms of sectioning strength, (2) using
a fixed mechanical grid, and (3) suffering increased artifacts (see later).
17.4 Limitations of Optical
Sectioning with SIM
Structured illumination is fairly easy to use, provides good optical sectioning
strength, and has a faster acquisition rate than its leading competitor, CSM, but
it has two main disadvantages. The first is that it requires ...