Microwave near-field microscope based on a photonic crystal with a cavity and a controlled coupling element as a probe

It is demonstrated that a 1D photonic crystal with periodicity defects can be used as a tunable cavity that makes it possible to control resonance features in the reflection spectrum of the probe of a microwave near-field microscope based on a cylindrical cavity with a loop coupling element. The probe is sensitive to variations in the parameters of dielectric plates under study with different permittivities and thicknesses of nanometer metal layers deposited on the dielectric plates in the measurements at fixed distances from the probe tip and in contact regime.