Ge / As / Se / Te chalcogenides have low phonon energies enabling mid-IR optics; photo-darkening and photo-induced refractive-index changes underpin DVD-RW and PCM memory.
Ge / As / Se / Te chalcogenides have low phonon energies enabling mid-IR optics; photo-darkening and photo-induced refractive-index changes underpin DVD-RW and PCM memory.