FIGURE 2. Plasma detectors, an example of miniaturization in detection.
From the following article:
Scaling and the design of miniaturized chemical-analysis systems
Dirk Janasek, Joachim Franzke and Andreas Manz
Nature 442, 374-380(27 July 2006)
doi:10.1038/nature05059
Photographs of an inductively coupled plasma with power consumption of 1 kW and a microhollow cathode plasma of less than 1 W. The whole of the microhollow cathode has a diameter of 100 
m.
