Non-unity permeability in InP-based Mach-Zehnder interferometer with metamaterial

An InP-based Mach-Zehnder interferometer combined with a metamaterial layer consisting of a split-ring resonator array was realized for observing phase shift due to the metamaterial effect. At 1.5-μm wavelength, the metamaterial showed non-unity relative permeability induced by magnetic interaction with propagating light in the device.