Enhanced transmission through quasirandom nanostructured dielectric interfaces via supercritical angle scattering

被引：0
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作者：
Riyopoulos, S. [1 ]
Moustakas, T.D. [2 ]
Cabalu, J.S. [2 ]
机构：
[1] Science Applications International Corporation, McLean, VA 22102
[2] Photonic Center, Boston University, Boston, MA 02215
来源：
| 1600年 / American Institute of Physics, 2 Huntington Quadrangle, Suite N101, Melville, NY 11747-4502, United States卷 / 102期
关键词：
Greatly enhanced radiation extraction has been observed through randomly textured interfaces with feature sizes comparable to the wavelength. Ray tracing fails in this regime and a different analytic treatment is presented based on supercritical scattering. A quasiperiodic interface destroys the k invariance; introducing wave numbers shifted by structure period harmonics; and allows transmission for supercritical incidence. Converting the interface boundary conditions into effective current source terms yield simple integral formulas for the transmitted fraction including quasiperiodic; subwavelength surface features with random variation of the feature size and period. Supercritical transmission occurs for single monochromatic wave incidence; regardless of the angle; causing enhanced radiation extraction. Further enhancement follows from multiple bounces between opposed surfaces. The role of phase diffusion during multiple reflections is also addressed. © 2007 American Institute of Physics;
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