Selective etching of pre-stressed multi-layered structures releases intrinsic stresses creating flexible macroscopic shapes (rolls, spirals, tubes…). Combining mechanical and photonic concepts, we develop an experimental approach by controlling material composition, mask design and etching process in order to obtain prescribed macroscopic 3D hollow optical micro-cavities. New photonic microstructures are proposed for an efficient light trapping in low index media. Cylindrical hollow cavities formed by bending a photonic crystal membrane are designed. Using numerical simulations, strong confinement of photons is demonstrated for very open resonators. The resulting strong light matter interaction can be exploited in optical devices comprising an active material embedded in a low index matrix like polymer or even gaz.
Recently, we developed a new family of 3D photonic hollow resonators which theoretically allow tight confinement
of light in a fluid (gaz or liquid): the photon cages. These new resonators could be ideal for sensing applications
since they not only localize the electromagnetic energy in a small mode volume but also enforce maximal overlap
between this localized field and the environment (i.e. a potential volume of nano-particles). In this work, we will
present numerical and experimental studies of the interaction of a photon cage optical mode with nano-emitters. For
this, PbS quantum dot emitters in a PDMS host matrix have been introduced in photon cages designed to have
optimal confinement properties when containing a PDMS-based active medium. Photoluminescence measurements
have been performed and the presence of quantum dot emitters in the photon cages has been demonstrated.
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