Jean-Paul Guillet

Welcome to my personal website! It presents my research activities at IMS laboratory in Bordeaux University and teaching at Bordeaux University Institute of Technology. You can find my list of publications or list of topics. To learn more about my research activities at IMS Laboratory, you can visit the Laser & terahertz test team website…

Is terahertz radiation dangerous?

The terahertz region is between the radio frequency region and infrared. Both the IEEE RF safety standard [1] and the ANSI Laser safety standard [2] have limits into the terahertz region, but both safety limits are based on extrapolations. The ICNIRP recommends that between 10 GHz and 300 GHz, the power density related to occupational exposure should…

What is Smartphonics

Smartphones have become ubiquitous objects in the daily lives of students. Rather than using them for entertainment, why not take advantage of this object to impart knowledge, experiment and teach? We use the word ‘Smartpnonics’ in the context of using the smartphone for education, and not as a smartphone study discipline. This word comes from…

NearSense – Advances Towards a Silicon-Based Terahertz Near-Field Imaging Sensor for Ex Vivo Breast Tumour Identification

This paper present the terahertz near field resonator developed in the framework of Nearsense project and pulse time domain images used to determine the best frequency and design the resonator. Mavarani, L., Hillger, P., Bücher, T., Grzyb, J., Pfeiffer, U. R., Cassar, Q., … & MacGrogan, G. (2018). NearSense–Advances Towards a Silicon-Based Terahertz Near-Field Imaging…

A Solid-State 0.56 THz Near-Field Array for μM-Scale Surface Imaging

We This paper presents a fully-integrated 0.56 THz 128-pixel near-field 1-D sensor array with 10-12 μm lateral resolution. The sensing elements are based two parallel cross-bridged split-ring resonators that utilize a 3-D topology to exhibit high field confinement in the sensing spot. The sensor comprises a scalable excitation scheme that is designed to maximize the…

Study of blood plasma optical properties in mice grafted with Ehrlich carcinoma in the frequency range 0.1 – 1.0 THz*

In the course of in vitro studies of blood of laboratory animals with progressing Ehrlich carcinoma, we have revealed the change of the blood plasma optical properties in the THz range, which can be used for developing the express diagnostics of the presence of oncological diseases. An applied software package is elaborated that allows the…

Terahertz biophotonics as a tool for studies of dielectric and spectral properties of biological tissues and liquids

In this review, we describe dielectric properties of biological tissues and liquids in the context of terahertz (THz) biophotonics. We discuss a model of the THz dielectric permittivity of water and water-containing media, which yields analysis of the relaxation and damped resonant molecules modes. We briefly describe modern techniques of THz spectroscopy and imaging employed in biophotonics with a strong emphasize on a…

Terahertz frequency modulated continuous wave imaging advanced data processing for art painting analysis

In this paper, we focus on data processing applied to terahertz FMCW measurement of a painting. Investigated paintings FMCW radar processing The proposed approach consist to use longitudinal information of FMCW signal to adjust amplitude. This calibration process was tested on a stepped target and then on the investigated painting, giving a more homogeneous result,…

What is terahertz?

Terahertz frequency band Terahertz (THz) waves is a part of the electromagnetic spectrum between infrared and microwave radiation corresponding to wavelenghts from 3 mm to 100 µm. In the frequency domain, it consists of the band from 100 GHz to 30 THz (See Fig 1.). For 1 Thz, wavelenght is about 300 µm, photo energy…

Terahertz Spectroscopy and Quantum Mechanical Simulations of Crystalline Copper-Containing Historical Pigments

Terahertz spectroscopy is a non-destructive analytical technique used in art conservation and restoration. It can provide compelling data concerning the composition and condition of culturally valuable and historical objects. Terahertz spectral databases of modern and ancient artists’ pigments exist, but lack explanations for the origins of the unique spectral features. This paper present terahertz spectra…