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Energy squeezing attracts many attentions for its potential applications inelectromagnetic (EM) energy harvesting and optical communication. However, dueto the Fabry-Perot resonance, only the EM waves with discrete frequencies canbe squeezed and, as far as we know, in the previous energy-squeezing devices,stringent requirements of the materials or the geometrical shape are needed. Wenote that the structures filled with epsilon-near-zero (ENZ) mediums asreported in some works can squeeze and tunnel EM waves at frequencies (e.g.plasma frequency). However, the group velocity is usually near zero which meansfew EM information travel through the structures. In this paper, low-lossenergy squeezing and tunneling (EST) based on unidirectional modes weredemonstrated in YIG-based one-way waveguides at microwave frequencies.According to our theoretical analysis and the simulations using finite elementmethod, broadband EST was achieved and the EM EST was observed even forextremely bended structures. Besides, similar EM EST was achieved in arealistic three-dimensional remanence-based one-way waveguide as well. Theunidirectional modes-based EST paving the way to ultra-subwavelength EMfocusing, enhanced nonlinear optics, and designing numerous functional devicesin integrated optical circuits such as phase modulator.

Broadband energy squeezing and tunneling based on unidirectional modes