Ultrafast time-domain spectroscopy techniques have evolved markedly over the past few decades, enabling the direct observation of physical, chemical and biological processes on timescales from ...

An Osaka Metropolitan University-led research team investigated the decay time of coherent longitudinal optical (LO) phonons both in a GaAs 1−x N x epilayer and in a GaAs single crystal, to clarify ...

Detecting concealed explosives and chemical threats constitutes a critical challenge in global security, yet current technologies often face significant operational limitations. While X-ray scanners ...

Certain materials have desirable properties that are hidden and scientists can use light to uncover these properties. Researchers have used an advanced optical technique, based on terahertz ...

Spectroscopy has many applications, ranging from fundamental tests of quantum electrodynamics and investigations of molecular ...

Ultrafast laser spectroscopy allows the ascertainment of dynamics over extremely short time scales, making it a very useful tool in many scientific and industrial applications. A major disadvantage is ...

Dual-comb spectroscopy uses paired ultrafast laser frequency combs to identify molecules by their spectral fingerprints, enabling broad scientific and sensing applications.

Terahertz techniques encompass a set of experimental and analytical methods that generate, manipulate, and detect electromagnetic radiation in the terahertz (THz) frequency range, typically 0.1–10 THz ...

Terahertz time-domain spectroscopy (THz-TDS) exploits ultrashort pulses of electromagnetic radiation in the 0.1–10 THz band to probe material properties with simultaneous amplitude and phase ...