Sarah Houver
YOU?
Author Swipe
View article: Roles of band gap and Kane electronic dispersion in the terahertz-frequency nonlinear optical response in HgCdTe
Roles of band gap and Kane electronic dispersion in the terahertz-frequency nonlinear optical response in HgCdTe Open
International audience
View article: Roles of band gap and Kane electronic dispersion in the THz-frequency nonlinear optical response in HgCdTe
Roles of band gap and Kane electronic dispersion in the THz-frequency nonlinear optical response in HgCdTe Open
Materials with linear electronic dispersion often feature high carrier mobilities and unusually strong nonlinear optical interactions. In this work, we investigate the THz nonlinear dynamics of one such material, HgCdTe, with an electronic…
View article: Ultrasmall and tunable TeraHertz surface plasmon cavities at the ultimate plasmonic limit
Ultrasmall and tunable TeraHertz surface plasmon cavities at the ultimate plasmonic limit Open
The ability to confine THz photons inside deep-subwavelength cavities promises a transformative impact for THz light engineering with metamaterials and for realizing ultrastrong light-matter coupling at the single emitter level. To that en…
View article: La spectroscopie TéraHertz: électrons et vibrations
La spectroscopie TéraHertz: électrons et vibrations Open
National audience
View article: Stabilizing electromagnons in CuO under pressure
Stabilizing electromagnons in CuO under pressure Open
Electromagnons (Electroactive spin wave excitations) could prove to be decisive in information technologies but they remain fragile quantum objects, mainly existing at low temperatures. Any future technological application requires overcom…
View article: La spectroscopie térahertz: électrons et vibrations
La spectroscopie térahertz: électrons et vibrations Open
Les progrès technologiques ces dernières décennies ont fait croître de façon exponentielle l’utilisation de la spectroscopie TéraHertz. Cette gamme spectrale (1 THz = 1012 Hz) permet de sonder et caractériser les phénomènes physiques à bas…
View article: 400 kHz repetition rate THz-TDS with 24 mW of average power driven by a compact industrial Yb-laser
400 kHz repetition rate THz-TDS with 24 mW of average power driven by a compact industrial Yb-laser Open
We demonstrate a high average power terahertz time-domain spectroscopy (THZ-TDS) set-up based on optical rectification in the tilted-pulse front geometry in lithium niobate at room temperature, driven by a commercial, industrial femtosecon…
View article: Spin singlet and quasiparticle excitations in cuprate superconductors
Spin singlet and quasiparticle excitations in cuprate superconductors Open
We followed step by step the transition from an antiferromagnetic (AFM) Mott insulator to a superconducting (SC) metal in the Bi2Sr2CaCu2O8 + δ (Bi-2212) cuprate using electronic Raman scattering…
View article: Disentangling lattice and electronic instabilities in the excitonic insulator candidate Ta$_2$NiSe$_5$ by nonequilibrium spectroscopy
Disentangling lattice and electronic instabilities in the excitonic insulator candidate Ta$_2$NiSe$_5$ by nonequilibrium spectroscopy Open
Ta$_2$NiSe$_5$ is an excitonic insulator candidate showing the semiconductor/semimetal-to-insulator (SI) transition below $T_{\text{c}}$ = 326 K. However, since a structural transition accompanies the SI transition, deciphering the role of…
View article: Solid-state biased coherent detection of ultra-broadband terahertz pulses generated in a spintronic emitter for high repetition rate, low pulse energy lasers
Solid-state biased coherent detection of ultra-broadband terahertz pulses generated in a spintronic emitter for high repetition rate, low pulse energy lasers Open
We report the coherent generation and detection of terahertz (THz) pulses featuring a spectral bandwidth in the range of 0.1-9 THz achieved via the use of a high repetition rate (250 kHz), low pulse energy (6.2 µJ) laser system. More speci…
View article: Nematic-Fluctuation-Mediated Superconductivity Revealed by Anisotropic Strain in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>Ba</mml:mi><mml:mo stretchy="false">(</mml:mo><mml:msub><mml:mrow><mml:mi>Fe</mml:mi></mml:mrow><mml:mrow><mml:mn>1</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub><mml:mrow><mml:msub><mml:mrow><mml:mi>Co</mml:mi></mml:mrow><mml:mrow><mml:mi>x</mml:mi></mml:mrow></mml:msub></mml:mrow><mml:msub><mml:mrow><mml:mo stretchy="false">)</mml:mo></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub><mml:msub><mml:mrow><mml:mi>As</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>
Nematic-Fluctuation-Mediated Superconductivity Revealed by Anisotropic Strain in Open
Anisotropic strain is an external field capable of selectively addressing the role of nematic fluctuations in promoting superconductivity. We demonstrate this using polarization-resolved elasto-Raman scattering by probing the evolution of …
View article: Strong modulation of carrier effective mass in WTe2 via coherent lattice manipulation
Strong modulation of carrier effective mass in WTe2 via coherent lattice manipulation Open
View article: 400 kHz repetition rate THz-TDS with 24 mW of average power driven by a compact industrial Yb-laser
400 kHz repetition rate THz-TDS with 24 mW of average power driven by a compact industrial Yb-laser Open
We demonstrate a high average power terahertz time-domain (THZ-TDS) spectrometer based on optical rectification in the tilted-pulse front geometry in lithium niobate at room temperature, driven by a commercial, industrial femtosecond-laser…
View article: Impact ionization in low-band-gap semiconductors driven by ultrafast THz excitation: beyond the ballistic regime
Impact ionization in low-band-gap semiconductors driven by ultrafast THz excitation: beyond the ballistic regime Open
Using two-dimensional THz spectroscopy in combination with numerical models, we investigate the dynamics linked to carrier multiplication caused by high-field THz excitation of the low-gap semiconductor InSb. In addition to previously obse…
View article: Spin singlet and quasiparticles excitations in cuprate superconductors
Spin singlet and quasiparticles excitations in cuprate superconductors Open
We followed step by step the transition from an antiferromagnetic (AF) Mott insulator to a superconducting (SC) metal in the Bi$_2$Sr$_2$CaCu$_{2}$O$_{8+δ}$ (Bi-2212) cuprate using the electronic Raman scattering spectroscopy. This was ach…
View article: Nematic fluctuations mediated superconductivity revealed by anisotropic strain in Ba(Fe$_{1-x}$Co$_x$)$_2$As$_2$
Nematic fluctuations mediated superconductivity revealed by anisotropic strain in Ba(Fe$_{1-x}$Co$_x$)$_2$As$_2$ Open
Anisotropic strain is an external field capable of selectively addressing the role of nematic fluctuations in promoting superconductivity. We demonstrate this using polarization-resolved elasto-Raman scattering to probe the evolution of ne…
View article: Solid-State Biased Coherent Detection of Ultra-Broadband Terahertz Pulses for high repetition rate, low pulse energy lasers
Solid-State Biased Coherent Detection of Ultra-Broadband Terahertz Pulses for high repetition rate, low pulse energy lasers Open
We report the coherent generation and detection of terahertz (THz) pulses covering the bandwidth of 0.1-9 THz in a high repetition rate, low pulse energy laser system. In this work we demonstrate the application and evaluation of solid-sta…
View article: Elasto-Raman scattering: arsenic optical phonon as a probe of nematicity in BaFe$_2$As$_2$
Elasto-Raman scattering: arsenic optical phonon as a probe of nematicity in BaFe$_2$As$_2$ Open
We report a Raman scattering study of nematic degrees of freedom in the iron-based superconductor parent compound BaFe$_2$As$_2$ under tunable uniaxial strain. We demonstrate that the polarization resolved arsenic (As) phonon intensity can…
View article: La supraconductivité à haute température dans les oxydes de cuivre : où en est-on ?
La supraconductivité à haute température dans les oxydes de cuivre : où en est-on ? Open
La supraconductivité est un phénomène quantique fascinant, car les effets qu’elle produit sont visibles à l’œil nu. Bien comprise dans les métaux standard (plomb, aluminium, étain...), elle reste largement incomprise dans certains oxydes d…
View article: Millimeter wave photonics with terahertz semiconductor lasers
Millimeter wave photonics with terahertz semiconductor lasers Open
Millimeter wave (mmWave) generation using photonic techniques has so far been limited to the use of near-infrared lasers that are down-converted to the mmWave region. However, such methodologies do not currently benefit from a monolithic a…
View article: Giant optical nonlinearity interferences in quantum structures
Giant optical nonlinearity interferences in quantum structures Open
We bring to light the complex interplay of optical nonlinearities in quantum structures.
View article: 2D THz spectroscopic investigation of ballistic conduction-band electron dynamics in InSb
2D THz spectroscopic investigation of ballistic conduction-band electron dynamics in InSb Open
ISSN:1094-4087
View article: THz Driven Dynamics in Mott Insulator GaTa<sub>4</sub> Se<sub>8</sub>
THz Driven Dynamics in Mott Insulator GaTa<sub>4</sub> Se<sub>8</sub> Open
GaTa 4 Se 8 is a Mott insulator known to exhibit an electric Mott transition, characterized by a drop in electrical resistivity, when an electric field larger than 1 - 10 kV/cm is applied for a few tens of microsecond…
View article: Giant optical nonlinearity cancellation in quantum wells
Giant optical nonlinearity cancellation in quantum wells Open
Second-order optical nonlinearities can be greatly enhanced by orders of magnitude in resonantly excited nanostructures, theoretically predicted and experimentally investigated in a variety of semiconductor systems. These resonant nonlinea…
View article: Short Terahertz Pulse Generation from a Dispersion Compensated Modelocked Semiconductor Laser
Short Terahertz Pulse Generation from a Dispersion Compensated Modelocked Semiconductor Laser Open
Dispersion compensation is vital for the generation of ultrashort and single cycle pulses from modelocked lasers across the electromagnetic spectrum. It is typically based on addition of an extra dispersive element to the laser cavity that…
View article: Short Terahertz Pulse Generation from a Dispersion Compensated Modelocked Semiconductor Laser (Laser Photonics Rev. 11(4)/2017)
Short Terahertz Pulse Generation from a Dispersion Compensated Modelocked Semiconductor Laser (Laser Photonics Rev. 11(4)/2017) Open
In the terahertz (THz) frequency range, a semiconductor-based technology for ultra-short pulse generation has yet to be realized. Here, a novel dispersion compensation scheme is applied to THz Quantum Cascade Lasers, based on an on-chip in…
View article: Resonant nonlinear optics in quantum cascade lasers
Resonant nonlinear optics in quantum cascade lasers Open
Les lasers à cascade quantiques (LCQ) sont des sources puissantes de rayonnement térahertz (THz) et moyen infrarouge (MIR). Elles reposent sur une transition intersousbande dans la bande de conduction des nanostructures semiconductrices co…
View article: Optique non-linéaire résonante dans les lasers à cascade quantique
Optique non-linéaire résonante dans les lasers à cascade quantique Open
Quantum cascade lasers (QCLs) are powerful terahertz (THz) and mid-infrared (MIR) sources. Their emission relies on intersubband transitions i.e. transitions between confined electronic states in the conduction band of these semiconductor …
View article: Optical sideband generation up to room temperature with mid-infrared quantum cascade lasers
Optical sideband generation up to room temperature with mid-infrared quantum cascade lasers Open
Mid-infrared (MIR) sideband generation on a near infrared (NIR) optical carrier is demonstrated within a quantum cascade laser (QCL). By employing an externally injected NIR beam, E(NIR), that is resonant with the interband transitions of …