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We study the THz radiation emission from interdigitated Photo-Conductive Antennas (iPCAs) fabricated on Semi-insulating GaAs substrates and excited using 800nm, 10fs, 76MHz laser pulses through circular and cylindrical Microlens arrays put over the antennas. THz emission is an order of magnitude higher from cylindrical micro-lens array compared to circular micro-lens array, at the same bias voltage...
We have explored the low-energy dynamics in the half-doped Eu0.5Sr0.5MnO3 using terahertz time domain (TDS) spectroscopy. Observation of a finite frequency peak structure in optical conductivity at around ∼4meV suggests low-energy excitation, presumably the charge-density waves.
Terahertz time domain spectroscopy was employed to explore the low-energy dynamics in the half-doped Nd0.5Sr0.5MnO3 (100) films. We have observed evolution of a peak structure in conductivity at around ∼4 meV which suggests the existence of charge-density waves.