期刊
OPTICS LETTERS
卷 44, 期 17, 页码 4279-4282出版社
OPTICAL SOC AMER
DOI: 10.1364/OL.44.004279
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- Department of Chemistry and Biochemistry, Brigham Young University
We present the structural and THz generation characteristics of the molecular salt crystal (E)-2-(4-(dimethylamino)-styryl)-1,1,3-trimethyl-1H-benzo [e] indol-3-ium iodide (P-BI) using optical rectification with IR pump wavelengths. P-BI shows a peak-to-peak field similar to 6 times greater than inorganic crystal GaP, and a broader THz spectrum. Data were obtained from 0-6 THz showing a significant dip in generation at 1.8 THz, similar to what has been observed with the THz generation crystal DAST at 1 THz. We characterized the power dependence of P-BI at different IR wavelengths, with optimal THz generation at the 1550-nm pump wavelength. To model THz generation as a function of P-BI crystal thickness, we measured the THz complex refractive index and the IR group index; modeling shows that imperfect phase matching leads to spectral narrowing centered at similar to 2.5 THz as the crystal thickness is increased. P-BI could provide a useful alternative to inorganic THz generation crystals such a GaP. (C) 2019 Optical Society of America
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