Pentagonal photonic crystal mirrors
Scalable lightsails with enhanced acceleration via neural topology optimization
L. Norder (TU Delft - Dynamics of Micro and Nano Systems)
Shunyu Yin (Brown University)
M.H.J. de Jong (Kavli institute of nanoscience Delft, TU Delft - QN/Groeblacher Lab)
F.S. Stallone (TU Delft - EKL Processing)
H. Aydogmus (TU Delft - EKL Processing)
Paolo Maria Sberna (TU Delft - Tera-Hertz Sensing)
Miguel A. Bessa (Brown University)
R. A. Norte (TU Delft - Dynamics of Micro and Nano Systems, Kavli institute of nanoscience Delft)
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Abstract
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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