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Offers : 62

Terahertz Identification of Materials by Multispectral

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Start date : 01/02/2022

offer n° IMEPLAHC-PHOTO-11-26-2021

Master internship – 2021-2022
TITLE: Terahertz Identification of Materials by Multispectral  Imaging


Laboratory: IMEP-LaHC (UMR 5130)
Supervisors: Emilie Hérault/Maxime Bernier
E-mail: emilie.herault@univ-smb. fr /

Context and objectives:
The field of terahertz waves (THz = 1000 GHz) is very promising for the detection of substances[1] and materials, for security purposes [2], or more generally for non-destructive testing in variousindustrial fields [3]. In the present project, the identification of substances is generally achievedthrough the presence of absorption lines in the THz spectrum, which is sensitive to the bending modes of the constituting molecules. The measurement of the spectral signature and/or the acquisition of a THz image of the sample to be identified over a large bandwidth (point-to-point multispectral imaging) is however often slow, preventing the dynamic study of materials evolving on time scales less than few minutes. TIMMING project aims at developing and studying the performances of innovating techniques and equipment for fast imaging of miscellaneous samples and the study of their sub-second dynamics.

Description of the Research Lab Work:
In this project, we aim at developing an efficient and rapid (real-time) characterization technique, applicable for example to the two application fields mentioned above (security and non-destructive testing). We plan to jointly use the possible specific and discriminating spectral signature of the material tested and a multispectral imaging technique for example to analyze the distribution of the components of a sample, to verify its non-alteration, its belonging to a batch, to identify its provenance and so on. The other idea, which will be prospected during the internship, is based on the use of innovating THz camera associated to THz CW source to perform THz videos.
In addition to the bibliographic work, the student who will be involved in the development of the imaging setup and of a signal processing algorithm based on an innovative theoretical classification/identification tools. He will also use the THz equipments already availlable in the PLATERA characterization platform [4]. In PLATERA, the student will have at his disposal a unique set of measuring equipment and scientific support by teachers-researchers specialized in the THz field.

[1] R. Miles, X.-C. Zhang, H. Eisele, A. Krotkus, « Terahertz Frequency Detection and Identification of Materials end
Objects », NATO Science for Peace and Security Series B: Physics and Biophysics, Springer Nature (2021).
[2] A.U. Sokolnikov, « THz Identification for Defense and Security Purposes », World Scientific (2013).
[3] D. Nüßler, J. Jonuscheit, « Terahertz based non-destructive testing (NDT) – Making the invisible visible »,
Oldenbourg Wissenschaftsverlag April 7 (2020) – DOI 10.1515/teme-2019-0100.

  • Keywords : Engineering sciences, Electronics and microelectronics - Optoelectronics, FMNT, IMEP-LaHc
  • Laboratory : FMNT / IMEP-LaHc
  • CEA code : IMEPLAHC-PHOTO-11-26-2021
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Measurement system for millimeter-wave antenna characterization

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Start date : 01/02/2022

offer n° IMEPLAHC-DHREAMS-11-19-2021

Master 1 training period / 2022
Measurement system for millimeter-wave antenna characterization at IMEP-LAHC
Laboratory: IMEP-LaHC – MINATEC – Grenoble



Supervisors / contacts:
Pascal XAVIER (scientific supervisor) Phone: 04 56 52 95 69
Nicolas CORRAO (technical support) Phone: 04 56 52 94 69

Context and objectives:
The constant development of communication standards (LAN, 5G, 6G…) and the emergence of new applications based on wireless propagation (Internet of Things, RFID chips, automotive radar systems, radar imaging radar sensors …) bring new technical requirements. Designing innovative antenna devices in the RF and millimeter-wave (mmW) spectrum is one of the main fields of interest for researchers at IMEP-LaHC Lab. Consequently, there is a strong need of
measurement setups to test and evaluate antenna parameters. Such characterizations are challenging because they require specific environmental conditions (quiet zone, free of EM perturbations or reflections) associated with a dedicated acquisition system.

This kind of installation is already available on HYPER platform at IMEP-LaHC. An indoor antenna test range is installed in a fully anechoic chamber to eliminate all reflections from the walls. This setup provides a powerful and accurate far-field measurement solution, typically used up to 40GHz. Therefore, a RF analyzer coupled with a 3-axis positioning system is used to perform the 3D radiation pattern measurement of the antenna under test. However, as the frequency increases, new strengths have to be considered. For example, at millimeter-wave frequencies (typically above 50GHz), antenna size becomes smaller and antenna gain decreases. Thus, the device is more sensitive to its close environment (connectors, mechanical parts…) which can strongly impacts its radiation. Moreover, the large attenuation at these frequencies must be taken into account when designing the measurement setup (short interconnection paths, antenna as close as possible to circuitry…).

Our existing antenna test range can’t meet all these new requirements. Therefore, another measurement solution has to be developed and dedicated especially to millimeter-wave devices. With this new separate setup, user should be able to extract 3D (quasi-sphere) radiation pattern and
gain from miniaturized or integrated devices, operating in V band (50 – 75GHz) or W band (75- 110GHz). Antenna under test could be fed either with precision coaxial connector or with microelectronic probe. In both cases, a special attention will be given to the surrounding parts of the antenna, in order to reduce measurement error caused by unwanted reflections.

Description of the work:
The required measurement setup described above is already under construction. The main parts and components are indeed at disposal on HYPER platform. A new 2-axis positioning system has been designed and fabricated. This one is also available and ready to work. It can be easily controlled using dedicated computer and software tool.

This lab work consists in several tasks, including existing setup improvements, design of still missing mechanical parts, final developments and installation, tests and validation of the whole system and finally training of users. All this tasks will bring the student to improve its skills in electromagnetism (RF and millimeter-wave measurements), obviously focused on antenna characterization methods. Even if the main part of the setup already exists, a lot of mechanical
adjustments and assemblies as well as RF tests have to be done to complete the project.

The proposed lab work implies of course a strong teamwork.

  • Keywords : Engineering science, Electronics and microelectronics - Optoelectronics, FMNT, IMEP-LaHc
  • Laboratory : FMNT / IMEP-LaHc
  • CEA code : IMEPLAHC-DHREAMS-11-19-2021
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Silicon on insulator sensors based on out-of-equilibrium reading for in-liquid applications

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Start date : 01/02/2021

offer n° IMEPLAHC-CMNE-11-4-2021

Silicon on insulator sensors based on out-of-equilibrium reading for in-liquid applications

Laboratory: IMEP-LAHC



Internship duration and period:
4-6 months, between February 2022 to July 2022.

Irina Ionica,

In the wide family of bio-chemical sensors, the ISFETs (Ion Sensing Field Effect Transistors) occupy a place of honor thanks to their multiple advantages such as miniaturization, sensitivity, co-integration with reading circuitry, connectivity, real-time monitoring, etc¹. The classical working principle is based on the shift of the threshold voltage of the transistor, induced by charges added in the proximity of its channel. Our team proved that SOI based devices are compatible with
an alternative original detection method, based on the shift of the out-of-equilibrium body potential (VB, in the figure aside).
The major advantage of measuring VB instead of the classic drain current /conductance resides in the strong potential signature, in a region were the current level is very low². This simplifies the measurement and can reduce the power consumption of the sensor.
A first objective of the internship is to fully bench-mark the two sensing methods on the same device.

In order to take this proof-of-concept from the “idea”-stage to real applications, eventually cointegrated with “green” materials, we’ll modify the architecture of the device and make it appropriate for liquid sensing and/or extended gate configuration. Indeed when moving to in-liquid applications, one expects to solve two (contradictory) issues: (1) the solid-state device must be encapsulated and protected from the liquid environment and (2) its sensing surface needs to be exposed to the liquid containing species to be sensed. A real benefit is to design and test a configuration with a disposable sensing surface that could be “plugged-in” an SOI device for the VB reading. The key-point at each development stage will be to ensure that the out-of-equilibrium potential is always detectable and even optimized in the alternative architectures.

Requested competences:
The topic is multidisciplinary and requires a wide panel of skills, covering technology, physics of semiconductor devices, electrical characterization and extraction of electrical parameters, simple functionalization steps, fluidics-related aspects…
The candidate is expected to enjoy experimental work, development of adapted protocols and be creative with respect to the possible solutions.

Application instructions:
send your CV, motivation letter (or e-mail) and transcript of records of the last 2 years to
We expect this internship to lead to a PhD thesis and we prefer candidates who are willing to continue during the PhD. An excellent track of records is mandatory.
1 Bergveld, P. Sensors and Actuators B: Chemical 2003, 88, (1), 1-20; Moser, N.; Lande, T. S.; Toumazou, C.; Georgiou, P. IEEE Sensors Journal 2016, 16, (17), 6496-6514.

2 Benea, L.; Bawedin, M.; Delacour, C.; Ionica, I. Solid-State Electronics 2018, 143, 69-76. Alepidis, M.; Bouchard, A.; Delacour, C.; Bawedin, M.; Ionica, I. ECS Meeting Abstracts 2021, MA2021-01, (59),

  • Keywords : Engineering sciences, Electronics and microelectronics - Optoelectronics, IMEP-LaHc, LMGP
  • Laboratory : IMEP-LaHc / LMGP
  • CEA code : IMEPLAHC-CMNE-11-4-2021
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Integrated photonic glucose sensor with in-situ temperature monitoring

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Start date : 01/02/2021

offer n° IMEPLAHC-PHOTO-10-28-2021

Master thesis /Master Recherche/PFE
(5 to 6 months)
Integrated photonic glucose sensor with in-situ temperature monitoring

The detection of glucose in water solutions plays an important role in many contexts. For instance, glucose sensors routinely monitor patient conditions in the management of diabetes mellitus. Furthermore, they find a wide range of applications for quality control in the food industry. Moreover, determining the glucose concentration while culturing cells allows estimating their metabolism, an important parameter of the culture [1].
Optical glucose sensors have been studied for many years and optical solutions are currently investigated for label-free sensing, continuous measurement in bio-reactors and chemical durability [2].
The IMEP-LaHC laboratory has a long experience in integrated photonics. In particular, complete fabrication facilities for optical integrated circuits on glass substrates are available, including clean room facilities [3].
The goal of the internship will be to fabricate an integrated photonic sensor for determining the glucose concentration exploring:

  • Either a resonant approach via an interferometer (such as a Mach-Zehnder structure) or a ring resonator.
  • Either a non-resonant approach with absorption spectroscopy.

Critical parameters, such as the refractive index of a glucose solution, often depend on the temperature. Hence, the sensor output can be strongly affected to a temperature change. There is therefore the need of monitoring the temperature, very close to the active region of the sensor. We are planning to achieve this by depositing a metallic layer, pattern it appropriately and monitor its electrical resistance by means of a 4-probe technique and an appropriate conditioning circuit.

To fulfill the objective of performing both optical and electric measurements on a fully integrated sensor, the student will have to:

  • Become acquainted with the subject through a detailed bibliographic research on the working principle of the sensor.
  • Study theoretically the behavior of the devices with state-of-the art software tools.
  • Fabricate devices with clean room micro-fabrication processes and with the ionexchange facilities available at the IMEP-LaHC.
  • Perform optical and electrical characterizations of fabricated devices

Davide BUCCI +33 (0)4 56 52 95 39

[1] Tang, Y., Petropoulos, K., Kurth, F., Gao, H., Migliorelli, D., Guenat, O., & Generelli, S. (2020). Screen-printed glucose sensors modified with cellulose nanocrystals (CNCs) for cell culture monitoring. Biosensors, 10(9), 125.
[2] Djisalov, M., Knežić, T., Podunavac, I., Živojević, K., Radonic, V., Knežević, N. Ž., … & Gadjanski, I. (2021). Cultivating Multidisciplinarity: Manufacturing and Sensing Challenges in Cultured Meat Production. Biology, 10(3), 204.
[3] Allenet, T., Geoffray, F., Bucci, D., Canto, F., Moisy, P., & Broquin, J. E. (2019). Microsensing of plutonium with a glass optofluidic device. Optical Engineering, 58(6), 060502

  • Keywords : Engineering sciences, Electronics and microelectronics - Optoelectronics, FMNT, IMEP-LaHc
  • Laboratory : FMNT / IMEP-LaHc
  • CEA code : IMEPLAHC-PHOTO-10-28-2021
  • Contact :

Electromagnetic characterizations of saline solutions with an open-ended coaxial probe in high frequency domain

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Start date : 01/02/2022

offer n° IMEPLAHC-DHREAMS-10-15-2021


M2 Training period subject

TITLE: Electromagnetic characterizations of saline solutions with an open-ended coaxial probe in high frequency domain.


Thierry Lacrevaz and Anne-Laure Perrier
Phone: 04 79 75 87 46; 04 79 75 94 18

E-mail: ;

Context et objectives:
Saline solutions as the water-lithium bromide (LiBr) working pair are used in absorption machine. Absorption machines are thermodynamic machines that allow the valorization of free and abundant heat sources (solar energy, waste heat) to meet the needs of buildings or industry.

To optimized the operation of theses machines it is necessary to know the temperature and the concentration of the solutions. We want to characterize the solutions of LiBr according to the frequency in order to realize sensors of temperature and/ or concentration. Characterization involves extracting the complex permittivity of the solutions according to the frequency. Figure 1 describes a complete liquid solution characterization system. A vector network analyzer will be used to perform measurements as a function of frequency. A coaxial probe will be immersed in the liquid to be characterized. The extremity of the probe will give access to an admittance or another relevant electrical quantity from which one can determine the complex permittivity.

The strong link between the complex permittivity of the solutions and the temperature and their LiBr concentrations will make it possible to design sensors based on the complex permitivity. Since LiBr solutions have high losses and high permittivities, characterization is not trivial.
Open-circuit coaxial probes are specifically developed for the characterization of liquids or soft materials because they have the advantage of being easy to use. Different techniques associated with the selected coaxial probes are proposed in the literature to extract the complex permittivity of liquids. These techniques [1,2] are often subject to strong assumptions which are only verified in cases where the liquids exhibit a low permittivity and low losses.

The work to be carried out will consist in studying the behavior of coaxial probes when they are immersed in liquids with high losses and high permittivities. In this context, will the techniques associated with the probes make it possible to extract the complex permittivity?

Works consist in electromagnetic modelling studies under HFSS software in order to apprehend the probes behavior regarding liquids with strong losses and strong permittivities. The aim will be to design and achieve probes in order to set up an experimental platform which will allow the high frequency characterization of saline LiBr solutions, that is to say extract their complex permittivities. The operating range frequencies will start to 200MHz up to 9GHz.

Description of the M2 internship topic:
The work to achieve will consist in performing electromagnetic simulations (HFSS) of an open-circuit coaxial probe immersed in different liquids; the probe is typically an SMA connector in contact with the liquid solution.

The first step is to observe and record the evolution of the lines of electromagnetic fields as a function of the permittivity and losses of the solution. These readings will make it possible to validate or not the hypotheses made in various published works: in particular, the maintenance of the shape of the field lines whatever the complex permittivity?

In a second step, probes will be fabricated and high frequencies measurements will be performed by diving probes in liquids to characterize. Extraction protocols will be developed to determine the saline solutions complex permittivities.

[1] Wagner & Al….. Numerical 3-D FEM and Experimental Analysis of the Open-Ended Coaxial Line Technique
for Microwave Dielectric Spectroscopy on Soil. IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING, VOL. 52, NO. 2, FEBRUARY 2014
[2] Seckin Sahin & Al….. Waveguide Probe Calibration Method for Permittivity and Loss Characterization of Viscous Materials. 978-1-7281-2056-0/20 – 2020 IEEE


  • Keywords : Engineering sciences, Electronics and microelectronics - Optoelectronics, FMNT, IMEP-LaHc
  • Laboratory : FMNT / IMEP-LaHc
  • CEA code : IMEPLAHC-DHREAMS-10-15-2021
  • Contact :
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