arXiv subjects

Sophie Eliet

Publications and source records attributed to Sophie Eliet.

4 recordsLinked to original sources

arXiv2026

Fully optoelectronic coherent THz spectroscopy

Coherent terahertz spectroscopy of molecular transients has so far relied on electronic sources whose bandwidth is limited to a fraction of their center frequency. Photoconductive devices offer a complementary approach, combining intrinsically broadband operation with coherent optoelectronic generation and detection. We report free-induction-decay spectroscopy of carbonyl sulfide at 0.29 THz in which, to our knowledge for the first time, both the pulsed emitter and the coherent heterodyne receiver are LT-GaAs photoconductors simultaneously pumped by a single free-running dual-frequency Ti:Sa laser. The receiver operates within 15 dB of the thermal noise limit, and the shared optical reference maintains phase coherence over more than 1000 averaged acquisitions. The measured transients agree with a time-domain Maxwell-Bloch model based on HITRAN parameters. These results demonstrate the feasibility of fully optoelectronic coherent THz spectroscopy and establish photoconductive optoelectronic mixing as a practical route toward frequency-agile, high-resolution coherent THz spectrometers over broad spectral ranges.

physics.app-ph↗

arXiv2024

Can the THz-TDS detect trace gases?

The THz-TDS is a versatile technique and can be used to probe gas phase molecules. We are pushing the technique to its limit to try and detect trace gases at the sub-ppm levels. The experiments served as a reference for a quantitative approach that permits to extract the concentration of a probed gas. The single-parameter quantification model can be considered as the basis for a wider multispecies detection scheme.

physics.ins-det↗

arXiv2024

Imaging nanomechanical vibrations and manipulating parametric mode coupling via scanning microwave microscopy

In this study, we present a novel platform based on scanning microwave microscopy for manipulating and detecting tiny vibrations of nanoelectromechanical resonators using a single metallic tip. The tip is placed on the top of a grounded silicon nitride membrane, acting as a movable top gate of the coupled resonator. We demonstrate its ability to map mechanical modes and investigate mechanical damping effects in a capacitive coupling scheme, based on its spatial resolution. We also manipulate the energy transfer coherently between the mode of the scanning tip and the underlying silicon nitride membrane, via parametric coupling. Typical features of optomechanics, such as anti-damping and electromechanically induced transparency, have been observed. Since the microwave optomechanical technology is fully compatible with quantum electronics and very low temperature conditions, it should provide a powerful tool for studying phonon tunnelling between two spatially separated vibrating elements, which could potentially be applied to quantum sensing.

physics.app-ph↗

arXiv2021

Broadband super-resolution Terahertz Time domain spectroscopy applied to Gas analysis

Terahertz (THz) Time domain spectroscopy (THz-TDS) is a broadband spectroscopic technique spreading its uses in multiple fields: in science from material science to biology, in industry where it measures the thickness of a paint layer during the painting operation. Using such practical commercial apparatus with broad spectrum for gas spectroscopy could be a major asset for air quality monitoring and tracking of atmospheric composition. However, gas spectroscopy needs high resolution and the usual approach in THz-TDS, where the recorded time trace is Fourier transform, suffers from resolution limitation due to the size of the delay line in the system. In this letter, we introduce the concept of constraint reconstruction for super-resolution spectroscopy based on the modeling of the spectroscopic lines in a sparse spectrum. Light molecule gas typically shows sparse and narrow lines on a broad spectrum and we propose an algorithm reconstructing these lines with a resolution improvement of 10 the ultimate resolution reachable by the apparatus. We envision the proposed technique to lead to broadband, selective, rapid and cheap gas monitoring applications.

physics.app-ph↗