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We present nanophotonic structures consisting of a dielectric slab waveguide with low index contrast and photonic crystals. The guided-mode resonance effect is used to implement elements with selective reflection properties. The design procedure, including numerical simulations, as well as a fabrication approach employing a focused ion beam system is described. Finally, a device layout with DBR mirrors to reduce lateral losses is discussed.

In this contribution, we present a systematic investigation on a series of spiroquaterphenyl compounds optimised for solid state lasing in the near ultraviolet (UV). Amplified spontaneous emission (ASE) thresholds in the order of 1 µJ/cm 2 are obtained in neat (undiluted) films and blends, with emission peaks at 390±1 nm for unsubstituted and meta-substituted quaterphenyls and 400±4 nm for para-ether substituted quaterphenyls. Mixing with a transparent matrix retains a low threshold, shifts the emission to lower wavelengths and allows a better access to modes having their intensity maximum deeper in the film. Chemical design and blending allow an independent tuning of optical and processing properties such as the glass transition.

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