Phys.org September 12, 2022
According to Moss rule the absorption edge and the sub-bandgap refractive index of a semiconductor exhibit a rigid trade-off setting an upper limit on the refractive index of a dielectric for a given operating wavelength. According to a team of researchers in the US (Rice University, Johns Hopkins University) there are many dielectric materials that surpass the Moss rule, referred to as super-Mossian dielectrics. They discussed the general features of super-Mossian dielectrics and their physical origin to facilitate the search for high index dielectrics. They developed iron pyrite with index nearly 40% higher than the Moss rule prediction. They observed local dielectric resonances in iron pyrite nanoresonators and demonstrated the impact of super-Mossian materials on nanophotonics…read more. TECHNICAL ARTICLEÂ
A scanning electron microscope image of an iron pyrite metasurface…Credit: The Naik Lab