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Theses

Semiconducting origamis : photonic resonators and topological applications

Abstract : Inspired from the Origami art of folding, the rolled-up nanotechnology has proved to be a competitive alternative toward the production of 3D microstructures through the self-rolling of pre-stressed membranes. This technique has enriched the palette of existing 3D microstructures, proposing unconventional geometries (tubes, coils) accessible with a large range of materials. Based on the stress-engineering method, a high degree of control over the size and geometry of the structures can be achieved, making them suitable in a wide range of applications. Among the variety of 3D architectures, rolled-up tubular microcavities have drawn great interest for optofluidic applications by combining their microchannel geometry and particular optical properties of the tube to produce highly sensitive fluid sensors.Applying the stress-engineering method to fold more complex surfaces such as photonic nanostructured membranes generates a new class of 3D photonic micro-objects with original designs and tailored optical properties. Micrometer-sized patterning provides additional degrees of freedom with the modification of the dispersion of the planar membrane, leading to various optical functionalities including the guiding, the trapping, or the slowing of light. In particular, the combination between photonic crystal patterns and 3D rolled-up geometries offers new strategies for the management of light.In this thesis, we propose the conception and characterization of “photon cages” based on the rolling of highly reflective 2D photonic crystal membranes. The reflecting walls allow to trap efficiently the light in the hollow low-index core, optimizing the overlap between the localized electromagnetic field and the surrounding medium, a keystone in sensing operations. Parameters of the photonic crystal membrane were adjusted to obtain an efficient reflector (reflectivity R>95%) over a large spectral range (>100 nm) in near infrared domain. The cylindrical cavity resonator model and FDTD simulations were used to predict the optical response of the rolled-up membrane. Tubular cavities were then fabricated using stress engineering technique. Near-field optical measurements were carried out to investigate the modes in the hollow of the cavity, revealing the presence of cavity modes in compliance with theoretical computations, and bringing an experimental validation to the photon cage concept.In this work, we also exploit the rolled-up nanotechnology to extend the analogy between solid-state and photonic structures toward the fabrication and characterization of photonic crystal analogues of carbon nanotubes. Numerical simulations were performed to design graphene-like photonic structures with a Dirac point centred at 1.55 µm. Numerical calculations of the topological invariant and the band structure of graphene-like photonic ribbons with zig-zag edge shape demonstrated the existence of topological edge states. We calculated the optical dispersion of photonic microtubes in accordance with zone-folding predictions. We report highly reproducible fabrication of photonic nanotubes with honeycomb pattern. Preliminary angular-resolved spectral measurements of the structures have revealed dispersive features of the membrane wall but no signature of the microtube yet.
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Submitted on : Friday, October 15, 2021 - 4:51:12 PM
Last modification on : Monday, October 18, 2021 - 10:56:09 AM

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  • HAL Id : tel-03380651, version 1

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Rémi Briche. Semiconducting origamis : photonic resonators and topological applications. Other. Université de Lyon, 2021. English. ⟨NNT : 2021LYSEC032⟩. ⟨tel-03380651⟩

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