Enhancement of electromagnetic fields with subwavelength microwave resonators
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Subwavelength microwave resonators based on double-ridge waveguides are proposed for applications that require strong electromagnetic fields under the constraint of limited microwave power. A key advantage of the proposed resonator structure is that magnetic couplings to the environment can be precisely controlled over a wide range of values with minimal impact on the resonance frequencies and quality factors. Another advantage is that inductances and capacitances are independent of each other, which offers flexibility in resonator design. A theoretical analysis for resonant conditions is given, and both numerical simulations and experimental measurements confirm that the resonators enhance electromagnetic fields by a factor of 40 in the near-field, equivalent to an effective electromagnetic energy density increase of 1600. The resonators are electrically small in size, have a high quality factor, and are suitable for the research of microwave frequency quantum electrodynamics. 2005 The American Physical Society.