Diffraction gratings can be used to achieve phase matching between the fundamental modes of a slab or confined waveguide. Compared with the usual techniques such as quasi-, Cerenkov, and intermodal phase matching, the matching method used here involves spatial harmonics of the guided electromagnetic field that are generated by the corrugated grating. This grating acts simultaneously as a linear waveguide coupler at both the pump and harmonic frequencies. Using the third spatial harmonic, we report what we believe to be the first observation of grating-assisted phase-matched second-harmonic generation between counterpropagating TM(0) modes of an organic waveguide.
Photopatternable hybrid inorganic-organic polymers with negative resist
behaviour have been developed and tested for evaluation in optical and
electrical interconnection technology. They are composed of inorganic oxidic
structures cross-linked or substituted by organic groups. The synthesis
starts from organosilane precursors reacted by sol-gel-processing in
combination with organic crosslinking of polymerisable organic functions. As
a result of these functionalities the properties of the ORMOCER®s are
adjusted to the particular applications. Systematic variation of composition
combined with adaptation to micro system technology allows great flexibility
in processing. The main features of these materials are:• Combined use as dielectric and passivation layers in electrical systems
and devices as well as core and cladding for optical applications enables
e/o applications with high integration levels.• Postbaking at moderate temperatures (120 - 170 °C) enables processing on
low-cost substrates such as FR-4 (a glass-fibre reinforced
epoxy-polymer).• Easily adaptable to thin film technology: spin-on with planarisation >
90 %, via diameters down to 20 μm and high aspect ratio for optical
waveguides have been achieved.Synthesis, modification of the resins towards technological needs, their
thin film technology and the resulting demonstrators will be discussed.
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