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F.S. Stallone
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5 records found
1
Journal article
(2026)
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Lucia Crocetto, Poonam Devi, Vidharshana Sivakumar, Francesco Stallone, Hande Aydogmus-Sasse, Sandra K. Raveendran, Padmakumar R. Rao
Low-temperature (≤ 350 °C) aluminum-induced layer exchange enables the integration of large-grained polycrystalline silicon–germanium layers into silicon-based optical, electronic, and electromechanical sensors, either in post-processing or at the back-end-of-line of a CMOS flow. We systematically investigate how annealing conditions, metal composition, diffusion control layer, and Al/a-Ge thicknesses influence the crystallization process and the resulting silicon–germanium layer. Our results reveal tunable correlations between process parameters and layer properties, demonstrating that both the crystallinity and the composition of the final layer can be precisely controlled. This work provides practical guidelines for tailoring aluminum-induced layer exchange for silicon–germanium integration across diverse device applications.
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Low-temperature (≤ 350 °C) aluminum-induced layer exchange enables the integration of large-grained polycrystalline silicon–germanium layers into silicon-based optical, electronic, and electromechanical sensors, either in post-processing or at the back-end-of-line of a CMOS flow. We systematically investigate how annealing conditions, metal composition, diffusion control layer, and Al/a-Ge thicknesses influence the crystallization process and the resulting silicon–germanium layer. Our results reveal tunable correlations between process parameters and layer properties, demonstrating that both the crystallinity and the composition of the final layer can be precisely controlled. This work provides practical guidelines for tailoring aluminum-induced layer exchange for silicon–germanium integration across diverse device applications.
Journal article
(2026)
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E. Aprea, F. Pirim, F.S. Stallone, Vasiliki Gkouzioti, Zhengwei Liao, L. Abelmann, J.P. Frimat, Pasqualina M Sarro, Clementine Boutry
Fully biodegradable microsystems enable therapies for temporary medical conditions that could not be addressed before. We present the first entirely biodegradable, wireless, implantable micropump for biomedical applications, with potential uses ranging from internal negative pressure wound therapy and drug delivery to soft robotics for temporary incontinence. As a proof-of-concept, the micropump was designed for peripheral nerve repair. It is magnetically actuated, featuring a nozzle/diffuser configuration, with a membrane of POMaC elastomer bonded to a magnetic POMaC/CIP composite. POMaC/CIP 20 wt% is selected for its mechanical and magnetic properties (Young’s modulus: 45 kPa, magnetic relative permeability: 1.14). A magnetic disc (6 mm x 0.5 mm) maximizes displacement and is actuated via a motor-driven magnetic setup at 4-8 Hz. An equivalent circuit model predicts under-pressure generation trends, confirmed experimentally through continuous/alternate pumping, repeatability assessments, and 240,000-cycle stability tests. In vitro and ex-vivo tests demonstrate consistent under-pressure (~2.3 kPa), meeting nerve regeneration requirements. Accelerated degradation tests show 31% mass loss after seven weeks, supporting short-term use. This platform is adaptable to diverse biomedical contexts, enabling novel therapies previously unachievable.
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Fully biodegradable microsystems enable therapies for temporary medical conditions that could not be addressed before. We present the first entirely biodegradable, wireless, implantable micropump for biomedical applications, with potential uses ranging from internal negative pressure wound therapy and drug delivery to soft robotics for temporary incontinence. As a proof-of-concept, the micropump was designed for peripheral nerve repair. It is magnetically actuated, featuring a nozzle/diffuser configuration, with a membrane of POMaC elastomer bonded to a magnetic POMaC/CIP composite. POMaC/CIP 20 wt% is selected for its mechanical and magnetic properties (Young’s modulus: 45 kPa, magnetic relative permeability: 1.14). A magnetic disc (6 mm x 0.5 mm) maximizes displacement and is actuated via a motor-driven magnetic setup at 4-8 Hz. An equivalent circuit model predicts under-pressure generation trends, confirmed experimentally through continuous/alternate pumping, repeatability assessments, and 240,000-cycle stability tests. In vitro and ex-vivo tests demonstrate consistent under-pressure (~2.3 kPa), meeting nerve regeneration requirements. Accelerated degradation tests show 31% mass loss after seven weeks, supporting short-term use. This platform is adaptable to diverse biomedical contexts, enabling novel therapies previously unachievable.
Pentagonal photonic crystal mirrors
Scalable lightsails with enhanced acceleration via neural topology optimization
Journal article
(2025)
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Lucas Norder, Shunyu Yin, Matthijs H.J. de Jong, Francesco Stallone, Hande Aydogmus, Paolo M. Sberna, Miguel A. Bessa, Richard A. Norte
The Starshot Breakthrough Initiative aims to send gram-scale microchip probes to Alpha Centauri within 20 years, propelled by laser-driven lightsails at a fifth of light speed. This mission demands innovative lightsail materials with meter-scale dimensions, nanoscale thickness, and billions of nanoscale holes for enhanced reflectivity and reduced mass. Unlike the microchip payload, lightsail fabrication requires breakthroughs in optics, materials science, and structural engineering. Our study uses neural topology optimization, revealing a novel pentagonal lattice-based photonic crystal (PhC) reflector. The optimized designs significantly lower the acceleration times and, thereby, launch cost. Crucially, they also enabled orders-of-magnitude fabrication cost reduction. We fabricated a 60 × 60 mm2, 200 nm thick reflector with over a billion nanoscale features, achieving a 9000-fold cost reduction per m2. This represents the highest aspect ratio nanophotonic element to date. While stringent requirements remain for lightsails, scalable, cost-effective nanophotonics present promising solutions for next-generation space exploration.
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The Starshot Breakthrough Initiative aims to send gram-scale microchip probes to Alpha Centauri within 20 years, propelled by laser-driven lightsails at a fifth of light speed. This mission demands innovative lightsail materials with meter-scale dimensions, nanoscale thickness, and billions of nanoscale holes for enhanced reflectivity and reduced mass. Unlike the microchip payload, lightsail fabrication requires breakthroughs in optics, materials science, and structural engineering. Our study uses neural topology optimization, revealing a novel pentagonal lattice-based photonic crystal (PhC) reflector. The optimized designs significantly lower the acceleration times and, thereby, launch cost. Crucially, they also enabled orders-of-magnitude fabrication cost reduction. We fabricated a 60 × 60 mm2, 200 nm thick reflector with over a billion nanoscale features, achieving a 9000-fold cost reduction per m2. This represents the highest aspect ratio nanophotonic element to date. While stringent requirements remain for lightsails, scalable, cost-effective nanophotonics present promising solutions for next-generation space exploration.
Conference paper
(2025)
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Elena Aprea, Francesco Stallone, Feyza Pirim-Aslan, Leon Abelmann, Pasqualina M. Sarro, Clementine Boutry
Peripheral Nerve Injury (PNI) leads to significant motor and sensory impairments, with limited recovery potential in injuries exceeding 3 cm, Conventional treatments often fail to achieve full functional restoration. Suction-based approaches at lesion sites have demonstrated promising outcomes in nerve regeneration. This work presents a novel wireless, magnetically actuated micropump composed of biodegradable materials, such as poly(octamethylene-maleate(anhydride)citrate) (POMaC), for nerve repair applications. The micropump integrates a magnetic ring within its membrane, enabling deflection under alternating magnetic field (4Hz,pm 150mT), generating a net under-pressure of 1.3 kPa within 8 minutes. It provides a potential solution to facilitate nerve healing.
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Peripheral Nerve Injury (PNI) leads to significant motor and sensory impairments, with limited recovery potential in injuries exceeding 3 cm, Conventional treatments often fail to achieve full functional restoration. Suction-based approaches at lesion sites have demonstrated promising outcomes in nerve regeneration. This work presents a novel wireless, magnetically actuated micropump composed of biodegradable materials, such as poly(octamethylene-maleate(anhydride)citrate) (POMaC), for nerve repair applications. The micropump integrates a magnetic ring within its membrane, enabling deflection under alternating magnetic field (4Hz,pm 150mT), generating a net under-pressure of 1.3 kPa within 8 minutes. It provides a potential solution to facilitate nerve healing.