Aug 92026 A Photonic Crystal in Time https://www.youtube.com</a> <a href="https://youtube.com">https://youtube.com</a> <a href="https://m.youtube.com">https://m.youtube.com</a> <a href="https://youtu.be">https://youtu.be</a> <a href="https://www.youtube-nocookie.com"">https://www.youtube-nocookie.com"</a> width="100%" src="https://disqus.com/recommendations/?base=default&f=opticsphotonicsnews&t_u=https%3A%2F%2Fwww.optica-opn.org%2Fhome%2Fnewsroom%2F2026%2Faugust%2Fa_photonic_crystal_in_time%2F%3F_gl%3D1*6fkaq1*_up*MQ&t_d=Optics%20%26%20Photonics%20News%20-%20A%20Photonic%20Crystal%20in%20Time&t_t=Optics%20%26%20Photonics%20News%20-%20A%20Photonic%20Crystal%20in%20Time#version=766d73907bba8512b2bbb7011aecddb5" horizontalscrolling="no" verticalscrolling="no"> Metamaterial-based device working at terahertz frequencies could be turned into a new type of laser.