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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.
Novel nanomaterials such as quantum dots and 2D materials are exciting for building
next-generation optoelectronic devices. Spectroscopic measurements of these materials
can reveal valuable information about the physical phenomena underlying their light
emission characteristics [1,2]. Moreover, their optical properties are strongly temperature
dependent. At cryogenic temperatures, atomic vibrations (phonons) get drastically suppressed,
which leads to narrower emission linewidths in these materials.
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 (hyperspectral imaging). Using test samples, such as quantum dots or
single molecules, the student will characterize the performance of the setup (i.e. spatial
and spectral resolution, detection efficiencies, cross sections, .. ) and gain valuable
hands-on experience with lasers and optics.
References:
[1] K. F. Mak and J. Shan, “Photonics and optoelectronics of 2D semiconductor transition metal
dichalcogenides”, Nat. Photonics 10, 216 (2016).
[2] T. Yan et al., “Photoluminescence properties and exciton dynamics in monolayer WSe2”, Appl. Phys. Lett. 105, 101901 (2014).
Prerequisites:
Basic knowledge of microscopy, electronics and measurement techniques.
Novel nanomaterials such as quantum dots and 2D materials are exciting for building next-generation optoelectronic devices. Spectroscopic measurements of these materials can reveal valuable information about the physical phenomena underlying their light emission characteristics [1,2]. Moreover, their optical properties are strongly temperature dependent. At cryogenic temperatures, atomic vibrations (phonons) get drastically suppressed, which leads to narrower emission linewidths in these materials. 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 (hyperspectral imaging). Using test samples, such as quantum dots or single molecules, the student will characterize the performance of the setup (i.e. spatial and spectral resolution, detection efficiencies, cross sections, .. ) and gain valuable hands-on experience with lasers and optics.
References: [1] K. F. Mak and J. Shan, “Photonics and optoelectronics of 2D semiconductor transition metal dichalcogenides”, Nat. Photonics 10, 216 (2016). [2] T. Yan et al., “Photoluminescence properties and exciton dynamics in monolayer WSe2”, Appl. Phys. Lett. 105, 101901 (2014).
Prerequisites: Basic knowledge of microscopy, electronics and measurement techniques.
Not specified
Supervisor:
Eric Bonvin (ebonvin@ethz.ch), Lukas Novotny (lnovotny@ethz.ch)
Supervisor: Eric Bonvin (ebonvin@ethz.ch), Lukas Novotny (lnovotny@ethz.ch)