Concept

Terahertz time-domain spectroscopy

Related publications (313)

Structural dynamics and electronic structure changes probed with lasers and X-rays

Majed Chergui, Wojciech Gawelda, Melanie Saes

Several new results and opportunities for ultrafast x-ray absorption spectroscopy (XAS) are demonstrated. It is possible to work with highly dil. solns. in transmission mode without dramatic loss of signal-to-noise ratio. This is very promising as one can ...

2004

Observing Photochemical Transients by Ultrafast X-Ray Absorption Spectroscopy

Majed Chergui, Melanie Saes

Accurate detn. of the transient electronic structures, which drive photochem. reactions, is crucial in chem. and biol. The authors report the detection of transient chem. changes on the picosecond time scale by x-ray-absorption near-edge structure of photo ...

2003

Dynamics of multi-photon processes in semiconductor heterostructures

The present work is devoted to the study of the dynamics of multi-photon processes in semiconductor heterostructures. A time-dependent description is important for understanding in detail the transient response of semiconductors excited by ultrashort optic ...

EPFL2003

Particle Size and Crystallinity Dependent Electron Injection in Fluorescein 27-Sensitized TiO2 Films

Ulf Anders Hagfeldt

Influence of processing parameters, such as autoclaving and firing temp., on the optical properties of nanocryst. anatase TiO2 film and on the process of electron injection from the dye fluorescein 27 to the as-prepd. films is studied. TEM and steady-state ...

2003

Coherent control of polariton parametric scattering in semiconductor microcavities

Benoît Marie Joseph Deveaud, Ursula Oesterle, Stefan Kundermann, Cristiano Ciuti, Michele Saba

In a pump-probe experiment, we have been able to control, with phase-locked probe pulses, the ultrafast nonlinear optical emission of a semiconductor microcavity, arising from polariton parametric amplification. This evidences the coherence of the polarito ...

American Physical Society2003

Attachment-induced ionization instability in electronegative capacitive RF discharges

Christoph Hollenstein, Antoine Descoeudres, Laurent Fabien Hubert Sansonnens

Attachment-induced ionization instability has been experimentally observed in O-2 and CF4 capacitive RF discharges using time-resolved voltage probe, Langmuir probe, optical emission and mass spectrometry measurements. This instability occurs under specifi ...

2003

Ultrafast phase-locked spectroscopy of excitons in quantum nanostructures

Benoît Marie Joseph Deveaud, Xiao Wang

We have investigated the ultrafast coherent dynamics of exciton-polaritons and excitons in semiconductor quantum nanostructures, including InGaAs/AlGaAs multi quantum well Bragg structures and AlGaAs/GaAs crescent shaped quantum wire samples, by using a ph ...

2002

Steady-state and time-resolved near-field optical spectroscopy of GaN/AlN quantum dots and InGaN/GaN quantum wells

Nicolas Grandjean

In this paper we performed steady-state and time-resolved near-field scanning optical spectroscopy on GaN/AlN quantum dot (QD) structures and InGaN/GaN multiple quantum wells (MQWs). The morphology of the QD sample is composed of islands in the 500-1000 nm ...

2002

Spectral and kinetic fluorescence properties of native and nonisomerizing retinal in bacteriorhodopsin

Majed Chergui, Stefan Haacke, Selma Schenkl

Steady-state and picosecond (ps) fluorescence studies of wild-type bacteriorhodopsin (wt-bR) and of a nonisomerizing analog locked in the all-trans configuration have been performed. Extending earlier work done by femtosecond absorption spectroscopy, we ob ...

2001

Carrier dynamics in group-III nitride low-dimensional systems: Localization versus quantum-confined Stark effect

Nicolas Grandjean

Continuous-wave and time-resolved optical spectroscopy is used to examine a variety of InGaN/GaN quantum-well and quantum-box samples. grown by molecular beam epitaxy. The results are analyzed in order to clarify the respective influences of electric field ...

2001

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