GUILLET Jean-Paul | IMS Bordeaux

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Terahertz integration for Societal interest applications

The aim of my research activity is to address disruptive issues on terahertz components and systems, so as to then respond to industrial or societal issues. It is presented in the form of an integration from terahertz components for which ruptures are considered, to terahertz systems.

Main research topics are :

Application-oriented holistic THz systems design
Photonics and electronics arrays design and integration
Nondestructive testing
Passive mmW & THz component design and testing
THz methods

Short bio :

Jean-Paul Guillet received the B.S. degree in electrical engineering from the University of Montpellier, Montpellier, France, in 2005, and the M.S. and Ph.D. degrees in optoelectronics and microwave engineering from the University of Montpellier, Montpellier in 2007 and 2010, respectively. From 2010 to 2011, he was teacher and postdoc at University of Montpellier. He joined the University of Bordeaux as postdoc at LOMA Laboratory from 2011 to 2013, focusing on THz imaging techniques with both photonics and electronics systems. He joined the IMS Labororatory at University of Bordeaux as Associate Professor and leads research in the terahertz field, from components to systems, including societal applications. In 2021-2022, he was invited research during on year at UCLA with Mona Jarrahi group.

Societal interest applications

Various applications of societal interest are possible using terahertz waves, more particularly with terahertz imaging and spectroscopy. For example, it is possible to analyze art and heritage objets, like art painting on canvas, as illustrated in Figure 2. In this example, structural defects were detected and helped in the restoration process^[Ma2018]. Terahertz

Figure 2 : Terahertz frequency modulated continuous wave imaging for non-destructive evaluation of painting and multilayer parts [1]

Photonics and electronics arrays design and integration

While current terahertz imaging systems are mainly based on single-point raster scanning systems, the need of high-speed imaging systems leads to the need of terahertz source and detector arrays. Based on this holistic requirement, several projects are underway to build and integrate 1D line or 2D arrays, using research custom CMOS technologies, FMCW radars, photoconductive antennas, or commercial THz cameras. That can be interated in near field, like for example CMOS systems (Nearsense project with U. Pfeiffer group) ^{[Pfeiffer2019]}or far field with broad pulse band (from 0.1 to 5 THz band) in collaboration with Mona Jarrahi from UCLA.

Nondestructive testing

Passive mmW & THz component design and testing

In the future, as the frequency increases, the design of THz systems will require the availability of passive components similar to those used in optics and microwaves. This entails adapting existing concepts from other bands of the electromagnetic spectrum, which presents challenges related to scaling. Additionally, new objects will need to be created to fulfill specific functions. Two short-term examples illustrate this point. Firstly, the development of terahertz waveguides encompasses two aspects: one focuses on waveguide-based sensors, while the other explores the coupling optimization of such plastic or metal waveguides. Secondly, the utilization of Luneberg THz antennas shows promise in expanding the frequency range and enabling applications in 6G and radar detection.

Figure 3 : An example of plastic terahertz waveguide based endoscope and an experimental image obtained using this system

THz methods

Experimental platform

Experimental activities are performed in ATLAS Platform.

Simulations

The development of active or passive THz components requires modeling means. For this, I use CST Microwave Studio to model and simulate structures used in THz applications, such as metallic or plastic waveguides, antennas (gradient index, geodesic, etc.), resonators, lines of transmission, etc.

References (full list of papers can be found on HAL)

[Ma2018] Ma, X., Wang, K., Fauquet, F., Roux, M., Dandolo, C. L. K., Mounaix, P., & Guillet, J. P. (2018, March). Terahertz frequency modulated continuous wave imaging for non-destructive evaluation of painting and multilayer parts. In Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications XI (Vol. 10531, pp. 246-251). SPIE.

[Pfeiffer2019]Pfeiffer, U. R., Hillger, P., Jain, R., Grzyb, J., Bucher, T., Cassar, Q., Mounaix, P., & Guillet, J. P & Zimmer, T. (2019). Ex vivo breast tumor identification: Advances toward a silicon-based terahertz near-field imaging sensor. IEEE Microwave Magazine, 20(9), 32-46.