Mad City Labs piezo nanopositioners include integrated, high-bandwidth, direct measurement position sensors with proprietary PicoQ® sensor technology, yielding unmatched precision and resolution capabilities due to the inherent low-noise properties of PicoQ® sensor technology.
Piezo nanopositioners with PicoQ® sensor technology have lower position noise than capacitive sensor systems and exhibit better inherent long time-scale stability due to low 1/f noise. Capacitive sensor systems exhibit large 1/f noise at 10 Hz and below, resulting in long term position drift. The industry standard measurement of inherent position noise of piezo nanopositioners is position noise power spectrum analysis [MacKay, James F. Understanding noise at the nanometer scale. Laser Focus World, 43.3, (2007)]. When selecting a nanopositioning system, every customer should insist on seeing the position noise power spectrum of the piezo nanopositioner over the entire usable range of the device, typically 0.01 Hz to 1000 Hz..The figures below demonstrate the noise power spectral density of Mad City Labs piezo nanositioners with PicoQ®sensor technology. Figure 1 shows that Mad City Labs long range piezo nanopositioning systems have a position noise floor in the tens of pm/√Hz. Note there is no rising 1/f noise at frequencies above 0.01 Hz.
Sub-nanometer stability requires a low position noise floor, particularly for long time scale applications.Figure 2 shows the impressive position noise floor (400 fm/√Hz) on a shorter range nanopositioning system with PicoQ® sensor technology. For a spectactular demonstration of the relevance of position noise in nanopositioning, see the Mad City Labs AFM measurements of nanpositioning steps.