A hyperbolic dispersion medium with a planar surface that can be used for subwavelength focusing is proposed. By combining the hyperbolic medium in a single slit with diffraction limit width, a laser beam could be focused to a subwavelength spot in the near field. Compared to a conventional superlens, the subdiffraction focusing in this work has higher optical throughput. Using a planar hyperbolic medium, which is actually alternating silver/dielectric multilayers, we showed that the focusing resolution of the designed device is down to ∼λ=5 using green light illumination (at a wavelength of 514.5nm). © 2011 Optical Society of America.
CITATION STYLE
Li, G., Li, J., & Cheah, K. W. (2011). Subwavelength focusing using a hyperbolic medium with a single slit. Applied Optics, 50(31). https://doi.org/10.1364/AO.50.000G27
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