Components Only
mK Nanopositioners
most positioner models available for ULT
experimental flexibility based on linear positioners,
rotators and scanners
made from beryllium copper
non-magnetic with enhanced thermal conductivity
/RES+ sensor for readout
enables reliable position readout below 1 K
Many experiments require nanoprecise motion of samples or probe
heads also at mK temperatures. Apart from SPM, based on linear
positioners and scanners, such applications would be rotation of
mesoscopic samples in magnetic fields, either by 1D or 2D rotators,
or using goniometers to tilt samples with respect to, e.g. optical
elements. Also, optical fiber probes may have to be positioned in situ
relative to planar waveguides for investigating photonic circuits such
as cavities coupled to superconductors.
Entering the ultra-low temperature regime requires a careful choice
of materials and used components. Not only thermal expansion has
to be taken into account, but also phase transitions of materials that
effect, e.g., thermal conductivity or magnetic properties.
Since titanium, the standard non-magnetic material used for
our nanopositioners becomes superconducting at about 400 mK,
attocube offers linear positioners, rotators and scanners made of
beryllium copper.
For better thermal conduction at interfaces, thermal links and sample
holders are usually Au plated. Last but not least, the dedicated '/
ULT' positioners are equipped with a special resistive sensor (/RES+).
These sensors allow for a reliable readout of absolute position also at
temperatures below 1 K.