arXiv subjects

Jérémie Maire

Publications and source records attributed to Jérémie Maire.

3 recordsLinked to original sources

arXiv2026

Thermal characterisation by Scanning Photothermal Radiometry using a random undersampled measurement scheme

Scanning Photothermal Radiometry (SPR) is an active thermal technique that is simultaneously non-destructive, contactless, and allows for temporal resolutions on the order of nanoseconds, spatial resolutions down to the sub-micrometre scale and at different depths. This scanning method can be time consuming thus this work shows that it is possible to reduce the amount of measurements taken by 6 when using SPR on a sample consisting of carbon fibres in an aluminium matrix. It uses irregular sampling on sparse signals, and a weighted random technique to further decrease the amount of samples needed.

eess.SP↗

arXiv2025

Infrared photothermal heterodyne imaging in thermally thick medium for thermo-optic property characterization

Measuring temperature fields in semi-transparent media requires the knowledge of material thermo-optic properties. While the current techniques are well established for isothermal thin films, they remain unexplored for thick media where temperature gradients need to be considered. This study proposes to generalize the current methods of infrared heterodyne photothermal imaging to thick media by combining transmittance measurements and thermo-optic modeling to measure simultaneously the thermoabsorbance and thermoreflectance coefficients in semi-transparent media. In this work, we demonstrate the validity of our methodology followed by the measurements of the thermo-optic properties of several materials: soft polymers (polydimethylsiloxane) and borofloat glasses.

physics.app-ph↗

arXiv2020

Injection locking in an optomechanical coherent phonon source

Spontaneous locking of the phase of a coherent phonon source to an external reference is demonstrated in an optomechanical oscillator based on a self-triggered free-carrier/temperature limit cycle. Synchronization is observed when the pump laser driving the mechanical oscillator to a self-sustained state is modulated by a radiofrequency tone. We employ a pump-probe phonon detection scheme based on an independent optical cavity to observe only the mechanical oscillator dynamics. The lock range of the oscillation frequency, i.e., the Arnold tongue, is experimentally determined over a range of external reference strengths, evidencing the possibility to tune the oscillator frequency for a range up to 350 kHz. The stability of the coherent phonon source is evaluated via its phase noise, with a maximum achieved suppression of 44 dBc/Hz at 1kHz offset for a 100 MHz mechanical resonator. Introducing a weak modulation in the excitation laser reveals as a further knob to trigger, control and stabilise the dynamical solutions of self-pulsing based optomechanical oscillators, thus enhancing their potential as acoustic wave sources in a single layer silicon platform.

physics.optics↗