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Offers : 21

3D imaging module with integrated optics

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Start date : 1 September 2020

offer n° PsD-DRT-20-0085

3D sensing by capturing depth images, is a key function in numerous emerging applications such as facial recognition, augmented reality, robotics or drones. CEA targets the development of an innovative 3D sensing module, inspired from Lidar, and including various innovative components, from the coherent optical source to the photo-detector. The proposed Postdoctoral Internship will focus on the definition of an integrated optics architecture coupled to an optical imaging system, optical simulation with internal code or commercial software, fabrication in micro-electronic clean-room, electro-optical characterization of individual components, computing of algorithms for signal or image processing, and demonstration of the whole system, for its miniaturization and integration for example in mobile devices such as a smartphone. The work will be performed in close collaboration with a research team that will develop in parallel a first version of the system in free space. A transfer to the industry is targeted in the end.

  • Keywords : Engineering sciences, Optics - Laser optics - Applied optics, DOPT, Leti
  • Laboratory : DOPT / Leti
  • CEA code : PsD-DRT-20-0085
  • Contact :

coupling of optomechanical resonators in quantum regime for microwave to Infrared photons conversion

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Start date : 1 October 2020

offer n° PsD-DRT-20-0036

The most promising quantum computing platforms today are operated at very low temperatures at microwave frequencies, while telecommunication networks capable of preserving information in non-conventional states (superposition, entanglement) use infrared photons in non-cryogenic environments. Current frequency conversion means offer poor conversion efficiencies (10-6), which make them unable to preserve the quantum nature of information. A very high efficiency optical microwave converter (>0.5) is an essential milestone to connect these two frequency domains and create a real network of distributed quantum computers (quantum internet). In this context, this post doc topic aims to develop such a converter by exploiting the multi-scale coupling properties of nanomechanical resonators NEMS.

Work is currently underway at Leti to address NEMS resonators in their fundamental state by an optomechanical coupling with microwave resonators. The objective of the post doc is to continue these efforts by integrating a high quality infrared optical cavity. To do this, he will be able to rely on the know-how put in place at Leti: the laboratory is one of the pioneers in the development of on-chip optomechanical transduction sensors that guide light in silicon and make it interact with a moving object such as a mechanical resonator. A collaboration is in place with the Néel Institute (CNRS) in Grenoble to characterize and study these devices at ultra-low temperature (<100 mK). The post-doctoral fellow will have to propose designs that can target the expected high levels of efficiency. The devices will be manufactured in Leti's clean room and must be compatible with industrial manufacturing scale-up (VLSI), then tested and compared to expected performance. It will then be necessary to review the modelling and design based on the measurements in order to ensure that all phenomena are understood.

  • Keywords : Condensed matter physics, chemistry & nanosciences, Engineering sciences, Optics - Laser optics - Applied optics, Radiation-matter interactions, DCOS, Leti
  • Laboratory : DCOS / Leti
  • CEA code : PsD-DRT-20-0036
  • Contact :

Non-volatile asynchronous magnetic SRAM design

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Start date : 1 October 2020

offer n° PsD-DRT-20-0069

In the applicative context of sensor nodes as in Internet of things (IoT) and for Cyber Physical Systems (CPS), normally-off systems are mainly in a sleeping state while waiting events such as timer alarms, sensor threshold crossing, RF or also energetic environment variations to wake up. To reduce power consumption or due to missing energy, the system may power off most of its components while sleeping. To maintain coherent information in memory, we aim at developing an embedded non-volatile memory component. Magnetic technologies are promising candidates to reach both low power consumption and high speed. Moreover, due to transient behavior, switching from sleeping to running state back and forth, asynchronous logic is a natural candidate for digital logic implementation. The position is thus targeting the design of an asynchronous magnetic SRAM in a 28nm technology process. The memory component will be developed down to layout view in order to precisely characterize power and timing performances and allow integration with an asynchronous processor. Designing such a component beyond current state of the art will allow substantial breakthrough in the field of autonomous systems.

  • Keywords : Engineering sciences, Technological challenges, Cyber physical systems - sensors and actuators, Electronics and microelectronics - Optoelectronics, DACLE, Leti
  • Laboratory : DACLE / Leti
  • CEA code : PsD-DRT-20-0069
  • Contact :

Measurement of active cell nematics by lensless microscopy

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Start date : 1 March 2020

offer n° PsD-DRT-20-0059

At CEA-Leti we have validated a video-lens-free microscopy platform by performing thousands of hours of real-time imaging observing varied cell types and culture conditions (e.g.: primary cells, human stem cells, fibroblasts, endothelial cells, epithelial cells, 2D/3D cell culture, etc.). And we have developed different algorithms to study major cell functions, i.e. cell adhesion and spreading, cell division, cell division orientation, and cell death.

The research project of the post-doc is to extend the analysis of the datasets produced by lens-free video microscopy. The post-doc will assist our partner in conducting the experimentations and will develop the necessary algorithms to reconstruct the images of the cell culture in different conditions. In particular, we will challenge the holographic reconstruction algorithms with the possibility to quantify the optical path difference (i.e. the refractive index multiplied by the thickness). Existing algorithms allow to quantify isolated cells. They will be further developed and assessed to quantify the formation of cell stacking in all three dimensions. These algorithms will have no Z-sectioning ability as e.g. confocal microscopy, only the optical path thickness will be measured.

We are looking people who have completed a PhD in image processing and/or deep learning with skills in the field of microscopy applied to biology.

  • Keywords : Life Sciences, Cellular biology, physiology and cellular imaging, Instrumentation, DTBS, Leti
  • Laboratory : DTBS / Leti
  • CEA code : PsD-DRT-20-0059
  • Contact :

Highly efficient Terahertz devices for Nano-Electronics Quantum Technology

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Start date : 1 April 2020

offer n° IMEPLaHC-11022020-PHOTO

                       IMEP-LAHC , CNRS , Chambéry, FRANCE

                                                        POST- DOCTORAL position in

Highly efficient Terahertz devices for Nano-Electronics Quantum Technology
We are seeking for a post-doctoral fellow in the frame of the project STEPforQubits
(Short TeraHertz Electrical Pulses for Qubits) funded by the french ANR agency.

The most recent developments of quantum electronic circuits made from 2D electron gas (2DEG) will make possible the demonstration of novel and fundamental experiments such as electron “quantum optics” experiments where single electron would behave as a single photon emitted in a quantum optical system [1]. However, in order to perform such fascinating experiments, it is required to excite, control and detect single electrons within a time-scale well below the nanosecond range. For that, we intend to use ultrafast optoelectronics as a generation technique of picosecond electrical pulses and to associate it with quantum electronics in 2DEG circuits. Today, the use of femtosecond lasers allows for the generation of electrical pulses with duration lower than a picosecond and frequency components in the THz range. This technique is commonly based on GaAs photoconductive switches and it is routinely used for THz experiment [2]. However, to our knowledge, it has never been successfully applied to the study of quantum electronic circuits. Hence, in this project we would like to build a new technological approach for quantum-technology by integrating quantum 2DEG circuits with highly efficient optoelectronic devices capable of generating picosecond electrical pulses with on-demand duration and amplitude.

Objectives of the postdoctoral fellowship:
The research work is focused on the development and experimental characterization of a new class of highly efficient photoconductive devices based on GaAs technology. The design of the component takes advantage of nano-photonic and plasmonic techniques in order to increase its efficiency [3]. After assessment of their performances, the devices will be co-integrated with a 2DEG circuit in order to demonstrate a first quantum experiment. Then, further developments toward new functionalities of the photoconductive devices will be addressed.

Collaboration and networking :
The research will be done by the group PHOTO at IMEP-LAHC, University Savoie Mont-Blanc in Chambéry  in collaboration with the group QuantECA in the Neel Institute, CNRS in Grenoble . Both groups enjoy international renown in their discipline. They are fully equipped with high speed electronics, lasers, THz benches, cryogenic instrumentation, clean room and nanofabrication facilities.

Required profile:
We are looking for a post graduate researcher with a PhD in Physics, Optics or Electronics. A previous experience in experimental THz optics, ultrafast laser science, integrated optics or optoelectronics will be of advantage. The successful post-doctoral fellow should have a background in at least one of the following fields: THz optics, ultrafast optics, optoelectronics, semiconductors components. The candidate should have demonstrated his-her ability for interdisciplinary collaboration with researchers and a corresponding track record of publications.

To apply for this position, please send your application as one single PDF file to Dr. J. F. Roux (see coordinates below). The application should contain a motivation letter including a short exposé with an outline of your research interests, CV, Master and PhD certificates and 2 reference contacts.

Foreseen start for the position: April 2020
Net Salary (after taxes): Approximatively 2000 € per month
Duration: 12 months (extendable up to 3 years)
Contact : Dr. Jean-Francois ROUX,

[1] Bauerle et al. 2018 Rep. Prog. Phys. 81 056503
[2] Eusebe et al. 2005 JAP 98, 033711

[3] Georgiou et al. ArXiV :  2001.01341



  • Keywords : Engineering science, Electronics and microelectronics - Optoelectronics, FMNT, IMEP-LaHc
  • Laboratory : FMNT / IMEP-LaHc
  • CEA code : IMEPLaHC-11022020-PHOTO
  • Contact :
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