With positive photoresists, the opposite occurs; two-photon absorption causes the photoresist polymeric chains to break and become soluble to the development solvent, so the reverse structure is ...

This is similar to how an optical cavity works — a tailored structure that traps light between ... allow photons to interact with each other (photon coupling) through matter.

This site presents the energy and photon intensity of gamma rays as seen in thermal-neutron capture in two tables, one in ascending order of gamma energy and a second organized by Z, A of the target.