Energy-efficient micrometer-sized 6G THz laser suppresses light leakage and scattering from a laser cavity in three dimensions

https://phys.org/news/2025-08-energy-efficient-ultracompact-laser-loss.html

"laser cavity combines flat-band with multi bound states in the continuum... periodic daisy-shaped air holes arranged in semiconductor photonic crystal sandwiched between 2 gold layers... scaling spacing between atoms in photonic crystal enables more wavelength types such as near-IR, visible... highly focused beam with minimal divergence... integrated optoelectronic devices, high-speed wireless communication, wearables, optical computing, data centers, medical imaging, advanced sensors"

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Shaping light in the terahertz range with photonic time crystals
https://www.eurekalert.org/news-releases/1138063

High-purity linearly polarized emission from a compact BIC laser

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