||In this bachelor research project, the thermal conductivity of very thin (50
nm) suspended Silicon Nitride (SiN) membranes is studied. These
membranes are used as mechanical resonators in optomechanical
experiments where quantum decoherence properties are studied. When
these optomechanical experiments are performed at low (mK)
temperatures, heating of the membrane by laser absorption perturbs
these measurements. Therefore, the thermal properties of these
membranes are studied in this project at room temperature with a
method which is in principle also applicable for cryogenic measurements.
In this project different methods are studied and the 3w method is
expected to be the best suitable method and is therefore investigated in
this project. Using this method, measurements have been done and a
signal containing thermal properties of the membrane is obtained.
However, due to the sample preparation, no thermal conductivty could
be extracted from this signal.