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We review fabrication and optics of polymeric high-Q whispering gallery mode resonators. They are employed as bio-sensors featuring selective parallel functionalization of arrays and integration into lab-on-a-chip systems. Liquid crystalline elastomers enable wide tunability of resonances. Elastomer substrates allow photonic molecules with tunable coupling gap.
Given the ever-growing demand of green energy, many efforts of the industrialized societies are spent in the development of new technologies for renewable energy. In particular, the nanophotonic community has been producing a great deal of alternative strategies to improve the performance of various photovoltaic technologies. Thin-film solar cells are the current state-of-the-art in solar energy technologies,...
The quest for efficient harvesting of solar radiation is one of the major areas of research in the renewable energy field. Through different photonic architectures it is possible to augment the optical absorption by trapping light within thin and ultra-thin films, the latter being desirable to decrease costs and efficiently extract the photogenerated charge carriers. Engineering the absorbing material...
Wall collision broadening of absorption lines of gases confined in porous media is a recently opened domain of high-resolution spectroscopy. Here, we present an experimental investigation of its application for pore size assessment. We report on the manufacturing of nanoporous zirconia ceramics with well-defined pore sizes fine-tuned from 50 to 150 nm. The resulting pore structure is characterized...
Due to their small mode volume, photonic crystal nanocavities are an ideal tool to study enhanced light-matter interactions. As the cavity resonance and Q-factor will change under the influence of objects brought into its evanescent field, the cavity can be used to measure the polarizability of those objects. We show for the first time that a photonic crystal nanocavities, can even be used to measure...
We demonstrate a silicon optical switch that can reroute optical signals within a switching time of just 3 ps. The switch is based on photonic crystal waveguides in a directional coupler geometry. The dispersion of the device has been engineered to provide slow-light enhancement, which allows the switching length of the device to be just 5 mum. The 3 ps switching time is demonstrated using free-carriers...
Diffracted waves are widespread in nature. They can be generated by the scattering with disordered and/or ordered system. Topological defects, such as phase dislocations or polarization singularities, can be hidden in complicated field pattern that arises from this multiple scattering. Photonic crystals owe their peculiar optical properties from the interference that emerges from the diffraction of...
With a phase-sensitive near-field microscope we measure the propagating of light through a 2D photonic crystal waveguide. We study how the different Bloch harmonics of the propagating light evanescently decay into the air above the waveguide. Furthermore, exploiting the phase sensitivity of our microscope, we are able to reconstruct the electric vector field distribution with subwavelength resolution...
We measure the in-plane electric field above a photonic crystal waveguide with a polarization- and phase-sensitive near-field microscope. We find polarization singularities and study the topology of the surrounding electric field at the nanoscale.
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