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Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities
Published on: November 30, 2012
Enhancing monochromatic multipole emission by a subwavelength enclosure of degenerate Mie resonances
Jiajun Zhao1, Likun Zhang2, Ying Wu1
1King Abdullah University of Science and Technology (KAUST), Division of Computer, Electrical and Mathematical Science and Engineering, Thuwal, 23955-6900, Saudi Arabia.
Abstract:
Sound emission is inefficient at low frequencies as limited by source size. This letter presents enhancing emission of monochromatic monopole and multipole sources by enclosing the source with a subwavelength circular enclosure filled of an anisotropic material of a low radial sound speed. The anisotropy is associated with an infinite tangential density along the azimuth. Numerical simulations show that emission gain is produced at frequencies surrounding degenerate Mie resonant frequencies of the enclosure, and meanwhile the radiation directivity pattern is well preserved. The degeneracy is theoretically analyzed. A realization of the material is suggested by using a space-coiling structure.
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