Focusing by varying the high-refractive-index square dielectric rods
Nanoelectronics Conference（2010）
Abstract
A graded photonic crystal formed by varying the high-refractive-index square dielectric rods is used as a structured lens to focus. This lens can realize high energy efficiency and large numerical aperture. Otherwise, the energy efficiency and the imaging quality can be greatly improved by adding a thin dielectric film on the two sides of the lens, and the energy efficiency increases as the fill factor increases. A lens with an aperture of 100 ¿m and a focus length of 50 ¿m is designed, the energy efficiency has achieved 48.5% in the case of fill factor as 44.7% by finite difference and time domain (FDTD) algorithm, and the spot size leads to the diffraction limit.
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Key words
graded photonic crystal,optical focusing,high-refractive-index square dielectric rods,dielectric thin films,structured lens,diffraction limit,size 50 mum,finite difference-time domain algorithm,photonic crystals,thin dielectric film,numerical aperture,fill factor,refractive index,finite difference time-domain analysis,focus length,size 100 mum,energy efficiency,lenses,photonic crystal,dielectrics,time domain,finite difference,image quality,energy efficient,optical imaging
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