Fabrication of crystalline organic waveguides with an exceptionally large electro-optic coefficient

Geis, W.; Sinta, R.; Mowers, W.; Deneault, S.J.; Marchant, M.F.; Krohn, K.E.; Spector, S.J.; Calawa, D.R.; Lyszczarz, T.M.
May 2004
Applied Physics Letters;5/10/2004, Vol. 84 Issue 19, p3729
Academic Journal
Single-crystal optical waveguides of 4-dimethylamino-N-methyl-4-stilbazolium tosylate (DAST), an organic material with a large electro-optic coefficient, have been obtained. DAST decomposes at its melting temperature, making its growth from the melt difficult. However, graphoepitaxy allows for >1 mm s-1 growth, 1 × 105 times faster than conventional techniques, and produces crystals of the correct dimensions for optical waveguides, 1-15 µm on a side and 5-10 mm long. The crystals grow with the c-axis normal to the substrate, and with in-plane orientation determined by lithographic patterning. The electro-optic coefficient dn/dE is 600±300 pmV-1 at 1.55 µm wavelength. Optical losses are <10 dB cm-1.


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