Vibration stabilization for cavity levitodynamics
In state-of-the-art levitodynamics experiments we combine optical tweezers with an optical cavity to cool the center of mass motion of a levitated nanoparticle close to its ground state energy. The experiments require extraordinary stability of the optical cavity with respect to the optical tweezer.
Self-induced back action trapping
Self-induced backaction (SIBA) trapping is a concept developed in optics for trapping of polarizable particles. The goal of this project is the analyze, design and characterize an electromechanical analog of SIBA trapping.
Excitation of vibrational modes in a levitated sphere
The objective of this project is to develop a stimulated Raman scattering setup (see figure) and to characterize the vibrational modes (acoustic phonons) of a levitated silica sphere. The work involves microwave electronics, optomechanics, and nonlinear optical spectroscopy.
Automated identification of two-dimensional crystals based on neural network
The goal of this project is to develop an automated setup that is able to identify monolayer flakes based on a recently proposed approach using neural networks. A software code will be developed that is capable of processing images and controlling a HW setup scanning the sample on a holder.
Integrated photonics with 2D materials
Two-dimensional (2D) materials are a group of layered materials that show great potential for on-chip optoelectronic devices. The unique feature of these materials is the possibility to assemble different 2D materials into a vertical heterostructure to form for example light emitting devices.
Nonlinear position calibration of an optically trapped nanoparticle
The light field scattered by an optically levitated nanoparticle encodes in its phase information about the position of the particle. An interferometric measurement allows us to retrieve the position of the particle.
Spectroscopy of levitated systems
The goal of this master project is to design and set up an RF trap for nano- and microparticles. This trap should provide sufficient numerical aperture for the spectroscopic investigation of the suspended object. The final goal of the project is to collect a Raman spectrum from a levitated particle.
Multivariate analysis and visualization of hyperspectral data
In hyperspectral imaging a sample is raster-scanned through the focal point of a laser beam and spectroscopic information is collected pixel by pixel. The resulting spectral hypercubes contain thousands of individual spectra as well as the spatial coordinates associated with each spectrum.
Development of a low-temperature spectroscopy platform for nanomaterials
In this project, the student will perform spectroscopic measurements on nanomaterials in the temperature range 1-300K by extending and modifying our current optical cryostat setup. The resulting setup will allow optical spectra to be recorded with a sub-micron spatial resolution.

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