In our previous work, we have theoretically shown that the temporal interface in a wire medium may result in an unambiguous encoding of the spatial frequencies of the initial wave package propagating along the wires into temporal frequencies of a created pulse propagating obliquely to them. This effect of encoding information on subwavelength spatial field distributions into frequency spectra of propagating waves opens a new door for far-field subwavelength imaging. Earlier, we suggested achieving the needed temporal interface with microplasma discharges. In the present paper, we show analytically and numerically that the same effect may be offered in a simpler and more practical way—by switching PIN diodes loading the wires. Since the temporal interface in this case occurs between two media with strong spatial dispersion, besides the wave packet responsible for the imaging a parasitic one is generated. However, the frequency range of this second wave packet is so different that it cannot spoil the image retrieval.

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• Medical imaging
• Optoelectronics
• Photonics
• Wire medium
• Effective medium approach
• Maxwell's equations
• Microwave techniques
• Super-resolution techniques