We report on the fabrication of inverted Yablonovite-like three-dimensional photonic crystals by nonlinear optical
nanolithography based on two-photon polymerization of a zirconium propoxide hybrid organic-inorganic material with
Irgacure 369 as photo-initiator. Advantage of this material is ultra-low shrinkage that guaranty high fabrication fidelity.
Images of the fabricated structure are obtained with a scanning electron microscope. The photonic crystal consists of
three sets of nearly cylindrical structural elements directed along the three lattice vectors of the fcc lattice and cross each
other at certain angles to produce inverted Yablonovite geometry. To investigate photonic properties of the inverted
Yablonovite structures, we calculate the photonic band structure for ten lowest-frequency electromagnetic modes. In
contrast to the direct Yablonovite structure that has a complete photonic band gap between the second and third bands,
we find no complete photonic band gaps in the inverted Yablonovite lattice. This situation is opposite to the case of fcc
lattice of close-packed dielectric spheres in air that has a complete photonic band gap only for the inverted geometry.
The optical properties of regular nanoparticle arrays consisting of spherical semiconductor and noble metal nanoparticles
are providing interesting aspects for the development of novel and powerful sensor concepts. In this contribution, we
demonstrate femtosecond laser-induced transfer of metallic and semiconductor thin films as a unique tool for realizing
controllable structures of any desired configuration of exactly spherical nanoparticles, having diameters between 40 nm
and 1500 nm. The optical properties of nanoparticles and nanoparticle arrays fabricated by this new approach are
investigated spectroscopically and by scattering of surface plasmon-polaritons (SPPs). SPP-scattering constitutes a novel
method to obtain insight into the contribution of different multipole moments to the scattering properties of the particles.
Furthermore, the particles can be combined with 3D photonic structures fabricated using two-photon polymerization,
providing new approaches to the development of nanophotonic devices and 3D metamaterials. Here, we demonstrate an
optical sensor with a sensitivity of 365 nm/RIU and a figure of merit of 21.5 in the visible spectral range.
We present our investigations into the design and fabrication of a complex shape, readily assembled micro check-valve
using the two-photon polymerization technique and a hybrid material. A computational fluid dynamics study has been
carried out in order to evaluate the flow performance of the valve under blood pressures exhibited in healthy human
veins. The fabricated micro-valves exhibit good dimensional accuracy when compared to the CAD-created valve design
and the capability of an internal moving component to perform its intended function.
In this work, we prepare and optically characterize novel, titanium-containing hybrid materials that can be
structured three-dimensionally using two-photon polymerization. We investigate the effect on the structurability
of the increase of titanium isopropoxide and methacrylic acid content in this photosensitive composite. We
show that while it is possible to make transparent thin films with titanium isopropoxide molar content as high as
90%, three-dimensional structures can be made only when the titanium isopropoxide molar content is less than
50%. We measure the refractive index of different titanium isopropoxide: methacrylic acid concentrations in the
composite. We show a linear increase of the composite refractive index with titanium isopropoxide
concentration, while the increase of the methacrylic acid content does not it.
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