JACQUES THIBODEAU


Hi, I'm Jacques. I am a master's student in physics who specializes in optics and thin films. In my free time, I like coding machine learning algorithms.

Current research:

I am currently a master's degree student at Université de Moncton in New-Brunswick, Canada. I love doing research and learning new things. My current research involves the Pulsed Laser Deposition of carbon thin films and studying its properties. I also use a z-scan set-up which I have built in order to measure nonlinear effects as well as thermal effects.

Patents

Alain Haché, Patrick Cormier, Jacques Thibodeau, Alexandre Doucet, Tran Vinh Son, Vo-Van Truong

Summary: VO2 is a material whose index of refraction changes when it is heated above a temperature of 68 °C, at which temperature the material undergoes a phase transition from insulator to metal. This index change modifies the phase of a light beam that is incident on the material, but in a different way according to the orientation of its polarization.

Link to PDF with a brief summary of the invention.

Publications

Patrick Cormier, Vinh-Son Tran, Jacques Thibodeau, Alexandre Doucet, Truong Vo- Van, Alain Haché, "Polarization control of light with vanadium dioxide", Optics Communications, DOI: 10.1016/j.optcom.2016.07.070 (2016)

Abstract: We report on the possible use of vanadium dioxide to produce ultrathin (<100 nm) adjustable phase retarders working over a wide spectral range. The refractive index of vanadium dioxide undergoes large changes when the material undergoes a phase transition from semiconductor to metal at a temperature of 68 °C. In a thin film, the resulting optical phase shift is different for s- and p-polarizations in both reflection and transmission, and under certain conditions the polarization state changes between linear or circular or between linear polarizations oriented differently when the material phase transitions. Specific ultrathin modulators are proposed based on the results.

Alain Haché, Patrick Cormier, Jacques Thibodeau, Alexandre Doucet, Phuong Anh Do, Tran Vinh Son, Vo-Van Truong, "Ultrathin high-contrast optical modulators for visible and near infrared applications", Proc. SPIE 9920, Active Photonic Materials VIII, 99201Z, DOI: 10.1117/12.2237435 (2016)

Abstract: We report the theory and experiment of how an ultrathin (<80 nm) layer of vanadium dioxide (VO2) can be used to control and adjust the polarization state of light. The refractive index of vanadium dioxide undergoes large changes when the material makes a phase transition from semiconductor to metal at a temperature of 68 °C. In a thin film, this results in optical phase shifts that are different for s- and p-polarizations in reflection or transmission. We investigate the conditions under which the polarization state would changes between linear or circular or between linear polarizations oriented differently during the material’s phase transition. The effect is demonstrated from 600 nm to 1600 nm and optical devices are proposed based on experimental data on refractive indices with temperature.

Patrick Cormier, Vinh-Son Tran, Jacques Thibodeau, Alexandre Doucet, Truong Vo- Van, Alain Haché, "Polarization control of light with vanadium dioxide", Optics Communications, DOI: 10.1016/j.optcom.2016.07.070 (2016)

Abstract: We report on the possible use of vanadium dioxide to produce ultrathin (<100 nm) adjustable phase retarders working over a wide spectral range. The refractive index of vanadium dioxide undergoes large changes when the material undergoes a phase transition from semiconductor to metal at a temperature of 68 °C. In a thin film, the resulting optical phase shift is different for s- and p-polarizations in both reflection and transmission, and under certain conditions the polarization state changes between linear or circular or between linear polarizations oriented differently when the material phase transitions. Specific ultrathin modulators are proposed based on the results.

Bassel Abdel Samad, Jacques Thibodeau, Pandurang Ashrit, "Preparation of nanostructured tungsten trioxide thin films by high pressure sublimation and condensation", Applied Surface Science, DOI: 10.1016/j.apsusc.2015.03.054 (2015)

Abstract: Thin films of tungsten trioxide (WO3) have gained increasing importance due to their interesting chromogenic properties and for their high application potential in electrochromic devices. It is very well known that their electrochromic switching properties depend very sensitively on their nanostructure. Hence, a vast majority of the research work carried out in this domain at present is dedicated to the various techniques of controlled inducing of a nanostructure in these WO3 thin films in order to enhance their electrochromic performance.

In the present work we have carried out a systematic study of the nanostructured WO3 thin films by using a novel technique of varying the source–substrate distance in a high pressure sublimation and condensation method. This technique has been found to be very efficient in controlling the grain size and thus the nanostructure of the deposited films. A correlation is established between the optical and electrochromic properties of the WO3 films and the induced nanostructure. The electrochromic properties are studied by a dry lithiation process developed in our laboratory. The results indicate a strong dependence of the film nanostructure on the source–substrate distance which influences quite sensitively the electrochromic properties. These results are expected to help design electrochromic devices suitable for different applications.

Jean-François Bisson, Gilles Patriarche, Tomy Marest, Jacques Thibodeau, "Nanostructure and luminescence properties of amorphous and crystalline ytterbium- yttrium oxide thin films obtained with pulsed reactive crossed-beam deposition", Journal of Material Science, DOI: 10.1007/s10853-014-8684-3 (2014)

Abstract: The nanostructure of ytterbium-doped yttrium oxide thin films, produced using pulsed laser ablation of a Yb–Y alloy target together with a pulsed flow of oxygen, is examined using X-ray and electron diffraction as well as Scanning Transmission Electron Microscopy (STEM). As-produced coatings are amorphous and become nanocrystalline cubic yttria after annealing. STEM images taken in the Bright-Field (BF) and in the High-Angle Annular Dark-Field (HAADF) modes reveal different aspects of the nanostructure of yttria. Simulations of the bixbyite structure of yttria indicate that dark spots arranged in a honeycomb structure seen in the STEM-BF mode arise from the absence of oxygen ions at regular crystallographic locations, while those seen on the HAADF images arise from cationic distortions. These results spectacularly exemplify the complementarity of the BF and HAADF imaging modes. Luminescence properties of amorphous and crystalline samples are also studied. Excitation of Yb3+ ions with an infrared (IR) laser diode produce both IR luminescence from excited Yb3+ and visible luminescence from holmium impurities present in the starting materials. Yb3+ emission bands become increasingly narrower as crystallization takes place, testifying for the transition from inhomogeneous to homogeneous crystal field. Increased lifetime and more intense luminescence observed after annealing imply reduced nonradiative relaxation and higher quantum efficiency.

About Me:

  • From Grand-Barachois, New-Brunswick.
  • Passionate about physics, coding, working out, playing music and dancing.
  • Working towards becoming the best version of myself.
  • Block myself from social media in order to do my best work possible.

Let's Get In Touch!


Send me an email if you would like to contact me!