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Offers : 20

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 : jean-frederic.christmann@cea.fr

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 : cedric.allier@cea.fr

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.

CONTEXT :
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, jean-francois.roux@univ-smb.fr

[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 : jean-francois.roux@univ-smb.fr

Nano-optomechanical silicon accelerometer for high performance applications

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Start date : 1 June 2020

offer n° PsD-DRT-20-0035

Inertial sensors (accelerometers and gyrometers) are at the heart of a large number of consumer-and low-cost applications such as smartphones and tablets, but also higher added value, higher-performance applications such as navigation for autonomous vehicles, aeronautics or space. Silicon microsystems (MEMS) are today a very mature technology and several millions are sold each year. However, they are today unable to address high-performance applications.

LETI has been pioneering the development of optomechanical sensors “on-chip”: light is guided in thin silicon layers in a similar way to photonics techniques. This light interacts with an object in motion such as a mechanical resonator or a seismic mass. This displacement modulates the intensity of the measured light, which allows the determination of the object’s acceleration. This technology was developed in the 2000s in fundamental research, and in particular enabled gravitational wave detectors. LETI is developing this technology on-chip at the nanoscale, with displacement sensitivities several orders of magnitude better than electrical transductions.

First optomechanical accelerometers were designed and fabricated in LETI’s quasi-industrial clean rooms for initial characterization tests. The hired fellow with have to become familiar with these devices, to confirm the first optical results, and then most importantly to assess their performances under acceleration: a test setup will have to be realized for this purpose. She or he will have to provide feedback on the modeling and the design from the measurements in order to ensure the comprehension of all phenomena at play. Finally, the postdoctoral fellow will have to propose new designs aimed at the expected high performances. These devices will be fabricated by the clean room, tested by the fellow and and compared to the expected performance.

Simulation and electrical characterization of an innovative logic/memory CUBE for In-Memory-Computing

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Start date : 1 January 2020

offer n° PsD-DRT-20-0029

For integrated circuits to be able to leverage the future “data deluge” coming from the cloud and cyber-physical systems, the historical scaling of Complementary-Metal-Oxide-Semiconductor (CMOS) devices is no longer the corner stone. At system-level, computing performance is now strongly power-limited and the main part of this power budget is consumed by data transfers between logic and memory circuit blocks in widespread Von-Neumann design architectures. An emerging computing paradigm solution overcoming this “memory wall” consists in processing the information in-situ, owing to In-Memory-Computing (IMC).

However, today’s existing memory technologies are ineffective to In-Memory compute billions of data items. Things will change with the emergence of three key enabling technologies, under development at CEA-LETI: non-volatile resistive memory, new energy-efficient nanowire transistors and 3D-monolithic integration. At LETI, we will leverage the aforementioned emerging technologies towards a functionality-enhanced system with a tight entangling of logic and memory.

The post-doc will perform electrical characterizations of CMOS transistors and Resistive RAMs in order to calibrate models and run TCAD/spice simulations to drive the technology developments and enable the circuit designs.

  • Keywords : Electronics and microelectronics - Optoelectronics, DCOS, Leti
  • Laboratory : DCOS / Leti
  • CEA code : PsD-DRT-20-0029
  • Contact : francois.andrieu@cea.fr
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