The rich potential of the microwave experiments for characterization and optimization of optical\ndevices is discussed. While the control of the light fields together with their spatial mapping at\nthe nanoscale is still laborious and not always clear, the microwave setup allows to measure both\namplitude and phase of initially determined magnetic and electric field components without significant\nperturbation of the near-field. As an example, the electromagnetic properties of an add-drop filter,\nwhich became a well-known workhorse of the photonics, is experimentally studied with the aid\nof transmission spectroscopy measurements in optical and microwave ranges and through direct\nmapping of the near fields at microwave frequencies. We demonstrate that the microwave experiments\nprovide a unique platform for the comprehensive studies of electromagnetic properties of micro- and\nnanophotonic devices, and allow to obtain data which are hardly acquirable by conventional optical\nmethods.
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