Broadband, High-Reflectivity Dielectric Mirrors at Wafer Scale: Combining Photonic Crystal and Metasurface Architectures for Advanced Lightsails
Abstract: Highly ambitious initiatives aspire to propel a miniature spacecraft to a neighboring star within a human generation, leveraging the radiation pressure of lasers for propulsion. One of the main challenges to achieving this enormous feat is to build a meter-scale, ultra-low mass lightsail with broadband reflectivity. In this work, we present the design and fabrication of such a lightsail composed of two distinct dielectric layers and patterned with a photonic crystal structure covering a 4" wafer. We overcome the crucial challenge of achieving broad band reflection of >70% spanning over the full Doppler-shifted laser wavelength range during spacecraft acceleration, in combination with low total mass in the range of a few grams when scaled to meter size. Furthermore, we find new paths to reliably fabricate these sub-wavelength structures over macroscopic areas and then systematically characterize their optical performance, confirming their suitability for future lightsail applications. Our innovative device design and precise nanofabrication approaches represent a significant leap toward interstellar exploration.
- G. Marx, Interstellar vehicle propelled by terrestrial laser beam, Nature 211, 22 (1966).
- R. L. Forward, Roundtrip interstellar travel using laser-pushed lightsails, J. Spacecr. Rockets 21, 187 (1984).
- M. S. Morris and K. S. Thorne, Wormholes in spacetime and their use for interstellar travel: A tool for teaching general relativity, Am. J. Phys. 56, 395 (1988).
- P. Lubin, A roadmap to interstellar flight, J. Br. Interplanet. Soc. 69, 40 (2016).
- Starshot Breakthrough Initiative.
- S. G. Turyshev and V. T. Toth, Image formation process with the solar gravitational lens, Phys. Rev. D 101, 044048 (2020).
- S. G. Turyshev and V. T. Toth, Resolved imaging of exoplanets with the solar gravitational lens, Mon. Notices Royal Astron. Soc. 515, 6122 (2022).
- N. Kulkarni, P. Lubin, and Q. Zhang, Relativistic spacecraft propelled by directed energy, Astron. J. 155, 155 (2018).
- P. Lubin and W. Hettel, The path to interstellar flight, Acta Futura 12, 9 (2020).
- D. Krejci and P. Lozano, Space propulsion technology for small spacecraft, Proc. IEEE 106, 362 (2018).
- O. Ilic, C. M. Went, and H. A. Atwater, Nanophotonic heterostructures for efficient propulsion and radiative cooling of relativistic light sails, Nano Lett. 18, 5583 (2018).
- K. V. Myilswamy, A. Krishnan, and M. L. Povinelli, Photonic crystal lightsail with nonlinear reflectivity for increased stability, Opt. Express 28, 8223 (2020).
- Z. Manchester and A. Loeb, Stability of a light sail riding on a laser beam, Astrophys. J. Lett. 837, L20 (2017).
- A. Macchi, S. Veghini, and F. Pegoraro, “light sail” acceleration reexamined, Phys. Rev. Lett. 103, 085003 (2009).
- Blue marble, NASA Visible Earth.
- J. D. Joannopoulos, P. R. Villeneuve, and S. Fan, Photonic crystals, Solid State Commun. 102, 165 (1997).
- R. V. Nair and R. Vijaya, Photonic crystal sensors: An overview, Prog. Quantum. Electron. 34, 89 (2010).
- J. Guo, R. A. Norte, and S. Gröblacher, Integrated optical force sensors using focusing photonic crystal arrays, Opt. Express 25, 9196 (2017).
- Thorlabs, Protected gold mirrors.
- F. L. Pedrotti, L. M. Pedrotti, and L. S. Pedrotti, Introduction to Optics (Cambridge University Press, 2017).
- W. J. Padilla and R. D. Averitt, Imaging with metamaterials, Nat. Rev. Phys. 4, 85 (2022).
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