Fuel free interplanetary travel? ‘Photonic crystal’ sail could help laser beams push spacecraft

Researchers at Tuskegee University have developed a revolutionary "photonic crystal" light sail that could enable fuel-free spacecraft propulsion by efficiently reflecting laser beams while remaining transparent to sunlight. Unlike traditional metal-coated sails that absorb light and overheat, this nanoscale material achieved 90% reflectivity during testing with a 100kW laser, demonstrating the potential for continuous thrust without the weight limitations of chemical fuel. This breakthrough could advance projects like Breakthrough Starshot that aim to propel spacecraft using photon power alone.