J. Tignon
Pierre-and-Marie-Curie University
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Publication
Featured researches published by J. Tignon.
Applied Physics Letters | 2004
J-S. Lauret; Christophe Voisin; G. Cassabois; J. Tignon; C. Delalande; Ph. Roussignol; O. Jost; Laurence Capes
Femtosecond pump–probe experiments have been carried out on an ensemble of single-wall carbon nanotubes deposited on a glass substrate. Measurements of transient changes of transmission and reflection provide an estimate of the real and imaginary parts of the second-order hyperpolarizability of carbon nanotubes. These values are compared with previous measurements and are discussed in the light of a simple model of the optical nonlinearities near the optical band-gap.
Optics Express | 2014
Peter John Hale; Julien Madéo; Catherine Chin; S. S. Dhillon; J. Mangeney; J. Tignon; Keshav M. Dani
We demonstrate broadband (20 THz), high electric field, terahertz generation using large area interdigitated antennas fabricated on semi-insulating GaAs. The bandwidth is characterized as a function of incident pulse duration (15-35 fs) and pump energy (2-30 nJ). Broadband spectroscopy of PTFE is shown. Numerical Drude-Lorentz simulations of the generated THz pulses are performed as a function of the excitation pulse duration, showing good agreement with the experimental data.
Optica | 2015
F. Wang; K. Maussang; Souad Moumdji; Raffaele Colombelli; Joshua R. Freeman; Iman Kundu; Lianhe Li; E. H. Linfield; A. Giles Davies; J. Mangeney; J. Tignon; Sukhdeep S. Dhillon
The generation of ultrashort pulses from quantum cascade lasers (QCLs) has proved to be challenging. It has been suggested that the ultrafast electron dynamics of these devices is the limiting factor for mode locking and, hence, pulse formation. Even so, the clear mode locking of terahertz (THz) QCLs has been demonstrated recently, but the exact mechanism for pulse generation is not fully understood. Here we demonstrate that the dominant factor necessary for active pulse generation is in fact the synchronization between the propagating electronic modulation and the generated THz pulse in the QCL. By using the phase-resolved detection of the electric field in QCLs embedded in metal–metal waveguides, we demonstrate that active mode locking requires the phase velocity of the microwave round-trip modulation to equal the group velocity of the THz pulse. This allows the THz pulse to propagate in phase with the microwave modulation along the gain medium, permitting short-pulse generation. Mode locking was performed on QCLs employing phonon depopulation active regions, permitting the coherent detection of large gain bandwidths (500xa0GHz) and the generation of 11xa0ps pulses centered around 2.6xa0THz when the above “phase-matching” condition is satisfied. This work brings an enhanced understanding of QCL mode locking and will permit new concepts to be explored to generate shorter and more intense pulses from mid-infrared, as well as THz, QCLs.
Scientific Reports | 2013
Vincenzo Ardizzone; P. Lewandowski; Ming-Ho Luk; Yuen-Chi Tse; N. H. Kwong; A. Lücke; Marco Abbarchi; Emmanuel Baudin; Elisabeth Galopin; J. Bloch; A. Lemaître; Pui-Tang Leung; Philippe Roussignol; R. Binder; J. Tignon; Stefan Schumacher
A generalization of Turing patterns, originally developed for chemical reactions, to patterns in quantum fluids can be realized with microcavity polaritons. Theoretical concepts of formation and control, together with experimental observations, will be presented.
Applied Physics Letters | 2017
O. Lafont; Samuel M. H. Luk; P. Lewandowski; N. H. Kwong; P. T. Leung; Elisabeth Galopin; A. Lemaître; J. Tignon; Stefan Schumacher; Emmanuel Baudin; R. Binder
The optical spin Hall effect is a transport phenomenon of exciton polaritons in semiconductor microcavities, caused by the polaritonic spin-orbit interaction, which leads to the formation of spin textures. The control of the optical spin Hall effect via light injection in a double microcavity is demonstrated. Angular rotations of the polarization pattern up to 22° are observed and compared to a simple theoretical model. The device geometry is responsible for the existence of two polariton branches which allows a robust independent control of the polariton spin and hence the polarization state of the emitted light field, a solution technologically relevant for future spin-optronic devices.
Optics Letters | 2012
J. Maysonnave; N. Jukam; M. S. M. Ibrahim; K. Maussang; J. Madéo; P. Cavalié; Paul Dean; Suraj P. Khanna; D.P. Steenson; E. H. Linfield; A. G. Davies; J. Tignon; Sukhdeep S. Dhillon
We used a terahertz (THz) quantum cascade laser (QCL) as an integrated injection seeded source and amplifier for THz time-domain spectroscopy. A THz input pulse is generated inside a QCL by illuminating the laser facet with a near-IR pulse from a femtosecond laser and amplified using gain switching. The THz output from the QCL is found to saturate upon increasing the amplitude of the THz input power, which indicates that the QCL is operating in an injection seeded regime.
IEEE Transactions on Terahertz Science and Technology | 2016
K. Maussang; Anthony Brewer; J. Palomo; J.-M. Manceau; Raffaele Colombelli; I. Sagnes; J. Mangeney; J. Tignon; Sukhdeep S. Dhillon
Interdigitated photoconductive antennas are powerful and easy-to-use sources of terahertz radiation for time-resolved spectroscopy. However, the emission of unwanted echoes, resulting from reflections of the emitted pulse in the antenna substrate, inherently limits the spectroscopic frequency resolution. A novel interdigitated photoconductive antenna that suppresses unwanted echoes from the substrate, without power losses, is proposed and demonstrated. This is realized through a buried metal geometry where a metal plane is placed at a sub-wavelength thickness below the surface antenna structure and GaAs active layer. In a reflection geometry this effectively eliminates echoes, permitting high resolution spectroscopy to be performed. As a proof-of-principle, the 1 01 -2 12 and the 2 12 -3 03 rotational lines of water vapor have been spectrally resolved with the new buried metal antenna, which are unresolvable with a standard antenna. In addition, as no THz field is lost to the substrate and reflections, the THz peak electric field amplitude is enhanced by a factor of three compared to a standard design in the equivalent reflection geometry.
Applied Physics Letters | 2013
P. Cavalié; Joshua R. Freeman; K. Maussang; E. Strupiechonski; Gangyi Xu; Raffaele Colombelli; Lianhe Li; A. G. Davies; E. H. Linfield; J. Tignon; S. S. Dhillon
We demonstrate the generation of high order terahertz (THz) frequency sidebands (up to 3rd order) on a near infrared (NIR) optical carrier within a THz quantum cascade laser (QCL). The NIR carrier is resonant with the interband transition of the quantum wells composing the QCL, allowing the nonlinearity to be enhanced and leading to frequency mixing. A phonon depopulation based QCL with a double metal cavity was used to enhance the intracavity power density and to demonstrate the higher order sidebands. The 1st order sideband intensity shows a linear dependence with THz power corresponding to a single THz photon, while the second order sideband has a quadratic dependence implying a two THz photon interaction and hence a third order susceptibility. These measurements are compared to the photoluminescence and the QCL bandstructure to identify the states involved, with the lowest conduction band states contributing the most to the sideband intensity. We also show that the interaction for the second order sideband corresponds to an enhanced direct third order susceptibility χ( 3 ) of ∼7u2009×u200910−16(m/V)2, two orders of magnitude greater than the bulk value.
Scientific Reports | 2016
M. Baillergeau; K. Maussang; T. Nirrengarten; J. Palomo; Lianhe Li; E. H. Linfield; A. G. Davies; S. S. Dhillon; J. Tignon; J. Mangeney
Diffraction is the ultimate limit at which details of objects can be resolved in conventional optical spectroscopy and imaging systems. In the THz spectral range, spectroscopy systems increasingly rely on ultra-broadband radiation (extending over more 5 octaves) making a great challenge to reach resolution limited by diffraction. Here, we propose an original easy-to-implement wavefront manipulation concept to achieve ultrabroadband THz spectroscopy system with diffraction-limited resolution. Applying this concept to a large-area photoconductive emitter, we demonstrate diffraction-limited ultra-broadband spectroscopy system up to 14.5u2009THz with a dynamic range of 103. The strong focusing of ultrabroadband THz radiation provided by our approach is essential for investigating single micrometer-scale objects such as graphene flakes or living cells, and besides for achieving intense ultra-broadband THz electric fields.
THE PHYSICS OF SEMICONDUCTORS: Proceedings of the 31st International Conference on the Physics of Semiconductors (ICPS) 2012 | 2013
K. Maussang; Jean Maysonnave; Nathan Jukam; Joshua R. Freeman; P. Cavalié; Suraj P. Khanna; E. H. Linfield; A. G. Davies; H. E. Beere; D. A. Ritchie; S. S. Dhillon; J. Tignon
Mode-locking of a terahertz quantum cascade laser is achieved using multimode injection seeding. Contrary to standard methods that rely on gain modulation, here a fixed phase relationship is directly imprinted to the laser modes. In this work, we demonstrate the generation of 9 ps phase mode-locked pulses around 2.75 THz. A direct measurement of the emitted field phase shows that it results from the phase of the initial injection.