Publications by authors named "Clara Rivero-Baleine"
Article Synopsis
- * Using secondary ion mass spectrometry, the research found that gallium penetrates several tens of microns into the material without causing significant changes in structure, as indicated by X-ray diffraction.
- * The results show that increasing gallium concentration leads to a substantial increase in surface hardness, achieving values more than double those of the untreated ZnS, with plans for future work to optimize this treatment for improved durability in harsh conditions.
Article Synopsis
- Ge-Sb-Se-Te chalcogenides are being studied as a new high-performance optical phase change material (PCM) to meet the integration needs of various photonic platforms.
- The research focuses on using chemical solution deposition to create uniform layers of these materials, comparing their properties with those made using thermal evaporation.
- Efforts are ongoing to enhance processing-combinations, aiming to produce high-quality optical PCMs that could lead to advancements in reconfigurable photonic devices.
In this Letter, we adapt the direct search method to metasurface optimization. We show that the direct search algorithm, when coupled with deep learning techniques for free-form meta-atom generation, offers a computationally efficient optimization approach for metasurface optics. As an example, we apply the approach to optimization of achromatic metalenses.
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- Active metasurfaces offer advanced optical technology that is smaller, more durable, and easier to manufacture compared to traditional optics.
- Optical phase-change materials (PCMs), especially GeSbSeTe (GSST), are particularly effective for these metasurfaces due to their ability to change optical properties non-volatilely and significantly.
- The research demonstrated highly tunable active metasurfaces with a large range of optical adjustments and the ability to steer light dynamically without sensitivity to polarization.
Active metasurfaces, whose optical properties can be modulated post-fabrication, have emerged as an intensively explored field in recent years. The efforts to date, however, still face major performance limitations in tuning range, optical quality, and efficiency, especially for non-mechanical actuation mechanisms. In this paper, we introduce an active metasurface platform combining phase tuning in the full 2π range and diffraction-limited performance using an all-dielectric, low-loss architecture based on optical phase change materials (O-PCMs).
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- Metasurfaces are innovative optical devices that can manipulate light in compact forms, unlike traditional bulky systems.
- The design process for meta-atoms, which are the basic components of metasurfaces, usually involves extensive trial and error, requiring a lot of computational power to explore a wide range of designs.
- This paper introduces a deep learning model based on convolutional neural networks (CNNs) that significantly speeds up the design process of meta-atoms, allowing for quick predictions of their optical responses, making it ideal for rapid design needs.
A novel photothermal process to spatially modulate the concentration of sub-wavelength, high-index nanocrystals in a multicomponent Ge-As-Pb-Se chalcogenide glass thin film resulting in an optically functional infrared grating is demonstrated. The process results in the formation of an optical nanocomposite possessing ultralow dispersion over unprecedented bandwidth. The spatially tailored index and dispersion modification enables creation of arbitrary refractive index gradients.
View Article and Find Full Text PDFIn this paper we explore the TeO(2)-Bi(2)O(3)-BaO glass family with varied TeO(2) concentration for Raman gain applications, and we report, for the first time, the peak Raman gain coefficients of glasses within this glass family extrapolated from non-resonant absolute Raman cross-section measurements at 785 nm. Estimated Raman gain coefficients show peak values of up to 40 times higher than silica for the main TeO(2) bands. Other optical properties, including index dispersion from the visible to the long wave Infrared (LWIR) are also summarized in this paper.
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