Abstract
Direct study and control of material properties using terahertz (THz) frequency pulses is an emerging subject with strong potential for future applications. One aspect of the development of THz-based techniques is the search for new materials that can efficiently convert higher frequency light into the THz-frequency range and serve to detect and characterize weak THz radiation with high sensitivity. Here, the capabilities of a new class of THz generators and detectors based on diphenylfluorenone (DPFO) crystals are explored. We demonstrate that DPFO crystals have an extremely large electro-optical coefficients centered at around f ≈ 1.5 THz which makes them ideal for THz detection at this frequency. Excitation with intense femtosecond near-infrared pulses leads to emission of narrow-band (Δf/f ≈ 20%) THz radiation near 1.5 THz. This frequency range does not overlap significantly with water vapor absorption lines, which allows for practical applications under ambient conditions.
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