Intense Terahertz radiation in organic crystals is typically generated by optical rectification of short wavelength infrared femtosecond lasers between 1.3 and 1.5 μm. In this wavelength range high energy ultrashort pump sources are hardly available. Here we present results on powerful THz generation by using DAST and DSTMS pumped directly by the widely used and well-established Ti:sapphire laser technology, emitting at 0.8 μm. This approach enables straightforward THz generation by optical rectification. We present systematic studies on
nIR-to-THz conversion efficiency, damage threshold, and on the emitted THz spectrum and field strength.
We have fabricated organic electro-optic single crystalline thin films on various inorganic substrates. A high
refractive index contrast of up to Δn = +0.6 at 1.55 μm with respect to glass substrates and up to Δn = -1.9
at 1.55 μm with respect to silicon substrates has been achieved. The single crystalline films can be grown
quasi-epitaxially without lattice matching and also on amorphous substrates providing appropriate interface
interactions and solid-liquid phase equilibrium conditions. The thickness of the single-crystalline films can vary
between less than 30 nm and above 5000 nm; they are therefore appropriate for optical waveguiding structures, as
well as nano-size electro-optic structures needed for future nanophotonics. Several organic electro-optic crystalline
materials have been employed using solution or melt-based processing. The techniques are suitable for the
fabrication of conventional wire electro-optic waveguides,
silicon-organic hybrid electro-optic waveguides, as well
as more complex organic-inorganic structures such as
single-crystalline electro-optic microring resonators.
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