Thesis, internship, and post-doc opportunities
169 results found
[Thèse]
Design and fabrication of a tunable III-V laser microsource coupled to a Silicon-On-Insulator photonic integrated circuit.
Offer N°: 2176
Silicon based Micro-Nano-Photonics has become a new active research area. The outstanding progress of the design and technology processes of the Photonic Integrated Circuits (PICs) makes it possible to consider its use in many applications: optical interconnections for CMOS Integrated Circuits (ICs), telecom/datacom systems, biophotonics…
Silicon based Micro-Nano-Photonics has become a new active research area. The outstanding progress of the design and technology processes of the Photonic Integrated Circuits (PICs) makes it possible to consider its use in many applications: optical interconnections for CMOS Integrated Circuits (ICs), telecom/datacom systems, biophotonics…
The critical issue regarding the development of Microphone-Nano-Photonic relates now to the realization of reliable active components. The challenge lies mainly in the art to integrate laser microsources on existing PICs and to ensure an efficient coupling with the submicronic-sized waveguides.
The heterogeneous and functional integration of III-V semiconductors and silicon is now considered as an inescapable approach. Association of silicon with low-index contrast materials according to scenarios of various nanopatterning schemes allows the realization of highly efficient devices for the optical confinement, e.g. an effective control of photons in space and time. Moreover, the III-V semiconductors materials bring their unique non-linear properties and emission characteristics that are unreachable to silicon.
It is in this competitive context that the PhD candidate will propose innovative proof-of-concepts, designs and prototypes based on CEA-LETI technologies. The main activities driven during the thesis are the design/modelling, the fabrication as well as the characterization of devices.
[Thèse]
Optical micro spectrometer integrated on silicon
Offer N°: 2190
This goal of this subject is to develop a new family of micro spectrometers based on the SWIFTS (Stationary Waves Integrated Fourier Transform Spectrograph) principle. This principle consists in sampling with photodetectors stationary waves generated by a reflection at the end of an optical waveguide, in order to obtain instantaneously, and statically an optical spectrum by Fourier Transform.
This goal of this subject is to develop a new family of micro spectrometers based on the SWIFTS (Stationary Waves Integrated Fourier Transform Spectrograph) principle. This principle consists in sampling with photodetectors stationary waves generated by a reflection at the end of an optical waveguide, in order to obtain instantaneously, and statically an optical spectrum by Fourier Transform.
Such a device uses a very small volume, but thanks to the recent progress in silicon photonics technology, it is possible to consider its integration on silicon, for better performances at a reduced price and an in ultimate small volume, enabling new applications such as portable gaz analyzer, spectrometric endoscope for diagnostic, spatial applications, spectroscopic imagery, etc…
The goal of this thesis is therefore to design, realize on silicon, and characterize a micro spectrometer integrated on silicon based on SWIFTS.
[Thèse]
Determination of the doping level in individual semiconducting nanowires by XPEEM spectromicroscopy
Offer N°: 2182
In this thesis work, we propose to implement the measurement of the doping level in individual semi-conducting nanowires by energy-filtered x-ray photoelectron emission microscopy (XPEEM), using core-level and valence electrons for imaging.
In this thesis work, we propose to implement the measurement of the doping level in individual semi-conducting nanowires by energy-filtered x-ray photoelectron emission microscopy (XPEEM), using core-level and valence electrons for imaging. The use of such a direct, non-destructive, spatially-resolved photoemission technique will be assessed regarding its benefits and complementarity with other emerging methods like TEM holography or atom-probe tomography (techniques available in the MINATEC Centre). The key issue of surface preparation of the nanowires will be refined on the basis of past successful experiments.
[Thèse]
Developments of nonofluidic devices for filtration application.
Offer N°: 2173
The thesis deals with applications of microsystems for lab on a chip where one challenge is the integration and the automation of biochemical protocol essays in portable or more sensitive system. Main features of these microsystems are concentration, purification, storage, mixing, detection… of chemical or biochemical species in micro-nano volume. In this field, micro and nanofluidic appears to be a particular dynamic research topic.
The thesis deals with applications of microsystems for lab on a chip where one challenge is the integration and the automation of biochemical protocol essays in portable or more sensitive system. Main features of these microsystems are concentration, purification, storage, mixing, detection… of chemical or biochemical species in micro-nano volume. In this field, micro and nanofluidic appears to be a particular dynamic research topic.
The subject of the thesis is precisely the evaluation of nanofiltration methods within channels having a size ranging from few tens to few hundreds nanometers. The student will design and fabricate nanofluidic chips using micronanotechnology processes. Fluidic chip will be characterized with nano-entities model such as LNP (lipid nano particule), then with biological species such as viruses. Beyond the simple size-based filtration, the aim of the study will be to analyse and exploit ionic selective phenomena that can appear only at the nanometre scale. One application is virus filtration from blood plasma. Involving physics, biology, micro and nano technology, nanofluidic experimentation, the subject of the thesis is highly multidisciplinary around nanosciences applications
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