Results 51 to 60 of about 52,939 (282)

THz QCL - Based active imaging applied to composite materials diagnostic [PDF]

, 2009
This paper is a presentation of the recently developed researches at OLIMPES laboratory in the field of active imaging using THz Quantum Cascade Laser applied to composite materials ...
Barbieri, Stefano, Destic, Fabien, Mollier, Jean-Claude, Petitjean, Yoann, Sirtori, Carlo   +4 more
core   +1 more source

DNA‐Templated 2D Heterostructures as Phototriggered Dynamic Nanohybrids: From Releasing Molecular Loads to Controlling Enzyme Biocatalytic Function

Advanced Functional Materials, EarlyView.
DNA strands are employed both as dynamic linkers and nanoscale templates for the integration of Ag2S nanoparticles on MoS2, which in turn imparted photothermal responsiveness; this feature permits the selective cargo (fluorophore, quantum dots or an enzyme) release from the MoS2 surface in response to local heat induced by light irradiation.
Kai Chen, Haosen Miao, Weiying Hong, Matteo Palma   +3 more
wiley   +1 more source

A Sulfur Hexafluoride Sensor Using Quantum Cascade and CO2 Laser-Based Photoacoustic Spectroscopy

Sensors, 2010
The increase in greenhouse gas emissions is a serious environmental problem and has stimulated the scientific community to pay attention to the need for detection and monitoring of gases released into the atmosphere.
Helion Vargas, Delson Schramm, Marcelo da Silva, Mila Rocha, Marcelo Sthel, Guilherme Lima, András Miklós   +6 more
doaj   +1 more source

Observing the intrinsic linewidth of a quantum-cascade laser: beyond the Schawlow-Townes limit

, 2010
A comprehensive investigation of the frequency-noise spectral density of a free-running mid-infrared quantum-cascade laser is presented for the first time.
Bartalini, S., Borri, S., Cancio, P., Castrillo, A., De Natale, P., Galli, I., Gianfrani, L., Giusfredi, G., Mazzotti, D.   +8 more
core   +1 more source

Imaging of Biphoton States: Fundamentals and Applications

Advanced Functional Materials, EarlyView.
Quantum states of two photons exhibit a rich polarization and spatial structure, which provides a fundamental resource of strongly correlated and entangled states. This review analyzes the physics of these intriguing properties and explores the various techniques and technologies available to measure them, including the state of the art of their ...
Alessio D'Errico, Ebrahim Karimi
wiley   +1 more source

Frequency-Comb-Assisted Terahertz Quantum Cascade Laser Spectroscopy

Physical Review X, 2014
We report a metrological-grade THz spectroscopy based on the combination of a THz frequency-comb synthesizer (FCS) and a THz quantum cascade laser (QCL).
S. Bartalini, L. Consolino, P. Cancio, P. De Natale, P. Bartolini, A. Taschin, M. De Pas, H. Beere, D. Ritchie, M. S. Vitiello, R. Torre   +10 more
doaj   +1 more source

A QCL model with integrated thermal and stark rollover mechanisms [PDF]

, 2014
There is a need for a model that accurately describes dynamics of a bound-to-continuum terahertz quantum cascade laser over its full range of operating temperatures and bias conditions.
Agnew, Gary, Cooper, Jonathan, Davies, A. Giles, Dean, Paul, Grier, Andrew, Harrison, Paul, Ikonic, Zoran, Indjin, Dragan, Khanna, Suraj P., Lachab, Mohammad, Lim, Yah Leng, Linfield, Edmund H., Rakic, Aleksandar D., Taimre, Thomas, Valavanis, Alexander   +14 more
core   +1 more source

Nanothermometry in Living Cells: Physical Limits, Conceptual and Material Challenges

Advanced Functional Materials, EarlyView.
Heat and temperature are fundamental to life. When nanothermometers began probing regions as small as a living cell, they triggered controversial claims of large intracellular temperature gradients. We review physical constraints energy‐conservation, entropy production, thermodynamic fluctuations, and molecular dynamics.
Taras Plakhotnik
wiley   +1 more source

Low-threshold terahertz molecular laser optically pumped by a quantum cascade laser

APL Photonics, 2016
We demonstrate a low-threshold, compact, room temperature, and continuous-wave terahertz molecular laser optically pumped by a mid-infrared quantum cascade laser. These characteristics are obtained, thanks to large dipole transitions of the active medium:
A. Pagies, G. Ducournau, J.-F. Lampin
doaj   +1 more source

The Influence of Dimensional Static and Dynamic Charge on the Spectral Parameters and Active Dynamic Conductivity of Resonanse Tunnelling Structures with Constant Electric Field

Фізика і хімія твердого тіла, 2017
In the model of effective masses and rectangular potentials obtained self-consistent solution of Poisson and Schrödinger equations for different concentrations of electrons.
I. V. Boyko, A. M. Gryschyk
doaj   +1 more source