Quantum-controlled 2-photon absorption under few-photon irradiation for optical nanoprinting

https://phys.org/news/2025-04-quantum-photon-strategy-powers-generation.html

"high light intensity boosts printing speed but degrades resolution/ risks damaging materials, while low light intensity preserves resolution but drastically slows process... overcomes, by precisely controlling number of photons within fs laser pulses enabling efficient 2-photon absorption even under ultra-low photon exposure, breaking diffraction... 26 nm feature sizes, 5 orders magnitude faster large-scale, high-resolution printing.... fabricated optical waveguides, microring resonators, complex bio-microfluidic channels"