Terahertz Vibrational Spectroscopy in Advanced Materials

Dear Colleagues,

Vibrational spectroscopy may be defined as an identification tool to measure the various vibrational energies related to atomic bonds, interactions, and structures in materials. It covers infrared (IR), Raman, and inelastic neutron spectroscopies. These spectroscopies have been extensively used to study elementary excitations in the THz range such as phonon, polariton, magnon, exciton, plasmon, boson peak, etc. Traditional IR spectroscopy reported frequency-dependent absorbance or transmittance. In contrast, the coherent terahertz generation technique using a femtosecond pulse laser enables the unique determination of a complex dielectric constant, and terahertz time-domain spectroscopy (THz-TDS) has attracted much attention. Compared with traditional IR spectroscopy, THz-TDS has a great advantage in the THz range down to 0.1 THz. In Raman spectroscopy, the development of a super-notch filter enables the measurement down to 0.1 THz using a single-grating monochromator. These developments in both Raman and IR spectroscopy in the terahertz range have enhanced the study of terahertz vibrational properties in various materials. Cold neutrons have energies typically in the millielectron volts range, which are in the same order as the THz range. Investigations of various solid-state excitations, molecular relaxations, and dynamic processes by these advanced spectroscopies in the THz range provide new insights into physics, chemistry, mineralogy, geology, biology, pharmacy, medical science, life science, and engineering.

This Special Issue will be devoted to the terahertz vibrational spectroscopy of these various fields for hard and soft materials. Original research papers and review articles are cordially invited for submission. The topics of interest include, but are not limited to, the following:

Prof. Dr. Seiji Kojima
Guest Editor

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• terahertz spectroscopy
• infrared spectroscopy
• Raman spectroscopy
• neutron scattering
• soft phonon
• boson peak
• polariton
• plasmon
• magnon
• charge density wave
• weak interactions
• Fano resonance
• polymorphism
• polyamorphism
• phase transition
• reaction
• field effects
• extreme conditions