Title :
Focusing by varying the high-refractive-index square dielectric rods
Author :
Chen, Sujuan ; Zhou, Chongxi ; Qiu, Chuaikai
Author_Institution :
State Key Lab. of Opt. Technol. for Microfabrication, Chinese Acad. of Sci., Chengdu, China
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.
Keywords :
dielectric thin films; finite difference time-domain analysis; lenses; optical focusing; photonic crystals; refractive index; diffraction limit; energy efficiency; fill factor; finite difference-time domain algorithm; focus length; graded photonic crystal; high-refractive-index square dielectric rods; numerical aperture; size 100 mum; size 50 mum; structured lens; thin dielectric film; Algorithm design and analysis; Apertures; Dielectric films; Energy efficiency; Finite difference methods; Focusing; Lenses; Optical design; Photonic crystals; Structural rods;
Conference_Titel :
Nanoelectronics Conference (INEC), 2010 3rd International
Conference_Location :
Hong Kong
Print_ISBN :
978-1-4244-3543-2
Electronic_ISBN :
978-1-4244-3544-9
DOI :
10.1109/INEC.2010.5424521
