Abstract
A subwavelength metallic slit is proposed to generate super-strong nano-illumination. We use the finite-difference time-domain method to present that character. By changing a subwavelength slit into several slits and fixing the total volume of the air slits, we found that the energy was enhanced in the nano-slits. The more nano-slits have the better effective of enhancement. The slits also make the output light beams focusing. Because of the successive enhancement processes, the light from the nano-slit could become hundred times stronger than the incident light and accordingly could have great potentials for applications in optical data storage, super-resolution imaging, lithography, photonics, and other applications that need nano-illumination.
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