Broadband terahertz time-domain spectroscopy : crystalline and glassy drug materials

Broadband terahertz time-domain spectroscopy of ferroelectric LiTaO3: Phonon-polariton dispersion

“…However, very recently, the widely tunable monochromatic Cherenkov phase-matched THz wave generator was developed using nonlinear optic crystals of ferroelectric MgO doped LiNbO 3 [5]. It enables the extension of the frequency limit of THz-TDS to a higher frequency [6]. Therefore, in the present study, we report the complex dispersion relation of phonon-polariton including the damping was reported for congruent lithium tantalate crystals using the broadband THz-TDS.…”

Terahertz time-domain spectroscopy and Raman scattering studies of incipient ferroelectric BaZrO3

“…By using the reflected or transmitted THz pulse from a sample, the dielectric property can observe directly without any assumption or Kramers-Kronig analysis [8,[9][10][11]. Permitivity in the terahertz region, especially, in far-IR, is dominantly determined by the ionic polarization which is derived from the optical phonons.…”

Boson peak dynamics of glassy glucose studied by integrated terahertz-band spectroscopy

“…The temperature was varied from 14 to 320 K using a liquid-helium flow cryostat system (Helitran LT-3B, Advanced Research Systems) [8,50,64]. We employed the Cherenkov-type MgO-doped LiNbO 3 emitter (TAS7500SU, Advantest Corp.) [8,[64][65][66] for the room-temperature broadband measurement.…”