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Power spectral density of SiN3 membrane
The thermally driven fluctuations of a suspended membrane define a time-continuous stationary signal. In this project, a compact setup will be developed to measure the position fluctuations of the membrane and to record its power spectral density (PSD).
The thermally driven fluctuations of a suspended membrane define a time-continuous stationary signal. In this project, a compact setup will be developed to measure the position fluctuations of the membrane and to record its power spectral density (PSD).
The setup to be developed and characterized is shown in the figure below. In short, the membrane is irradiated by a laser and the back-reflected field is superimposed to a reference beam whose phase can be adjusted by changing the path length z. The
interference signal contains information on the position of the membrane and its fluctuations.
The PSD is obtained by Fourier transforming the photodetector signal.
Based on the PSD the student will determine the sensitivity limits and analyze the vibrational modes of the membrane.
References:
[1] T. Bagci et al., “Optical detection of radio waves through a nanomechanical transducer,” Nature
507, 81 (2014).
The thermally driven fluctuations of a suspended membrane define a time-continuous stationary signal. In this project, a compact setup will be developed to measure the position fluctuations of the membrane and to record its power spectral density (PSD). The setup to be developed and characterized is shown in the figure below. In short, the membrane is irradiated by a laser and the back-reflected field is superimposed to a reference beam whose phase can be adjusted by changing the path length z. The interference signal contains information on the position of the membrane and its fluctuations. The PSD is obtained by Fourier transforming the photodetector signal. Based on the PSD the student will determine the sensitivity limits and analyze the vibrational modes of the membrane.
References: [1] T. Bagci et al., “Optical detection of radio waves through a nanomechanical transducer,” Nature 507, 81 (2014).
Not specified
Supervisor: Felix Tebbenjohanns (tefelix@student.ethz.ch), Lukas Novotny (lnovotny@ethz.ch)
Supervisor: Felix Tebbenjohanns (tefelix@student.ethz.ch), Lukas Novotny (lnovotny@ethz.ch)