期刊
OPTICAL REVIEW
卷 14, 期 6, 页码 359-361出版社
OPTICAL SOC JAPAN
DOI: 10.1007/s10043-007-0359-8
关键词
Morpho butterflies; butterfly iridescence; structural color; subwavelength diffractive optical elements; gratings and diffraction; interference; electromagnetic theory; finite-difference time-domain method
类别
In certain species of moths and butterflies iridescent colors arise from subwavelength diffractive surface corrugation of the wing-scales. The optical properties of such structures depend strongly on wavelength, incidence angle, and state of polarization of illuminating radiation, and the viewing angle. In this paper, we study the reflection spectra of the wings of the Morpho didius butterfly by simulating a double-layered model of a transverse cross-section comprised of the ground scale and the cover scale. Each layer contains a certain quasi-periodic arrangement of tree-like subwavelength micro structures. The simulation is done using a high accuracy nonstandard finite-difference time-domain (FDTD) method in two dimensions. We assume that the structure is made of a slightly lossy dielectric material. The wavelength dependence of the complex refractive index for the ground scale of Morpho didius is assumed to be similar to that of Morpho sulkowskyi. The complex refractive index in the latter case was obtained by comparing the computed reflection/transmission spectra with corresponding experimental measurements at normal incidence. (C) 2007 The Optical Society of Japan.
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