Rigorous transmittance analysis of a sub-wavelength Sb thin film lens |
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| Authors: | F. Zhou X. Gan W. Xu F. Gan |
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| Affiliation: | (1) Shanghai Institute of Optics and Fine Mechanics, Academia China, P.O. Box 800-211, Shanghai, 201800, P.R. China;(2) Centre for Micro-Photonics, Swinburne University of Technology, P.O. Box 218, Hawthorn Victoria, 3122, Australia |
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| Abstract: | We quantitatively analysed the factors contributing to the optical transmission enhancement of a sub-wavelength Sb thin film lens, using the finite-difference time-domain (FDTD) method. The results show that the transmission enhancement of the dielectric with a Gaussian distributed refractive index loaded in a sub-wavelength circular hole is not only due to the high refractive index dielectric, but also due to the specific distributions of refractive index. It is the first study about the effects of the refractive index distribution on the transmission of a sub-wavelength aperture. This kind of lens has practical applications in the very small aperture lasers and for near-field optical storage and lithography. PACS 42.79.Ag; 42.25.Bs; 42.25.Fx |
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