科研之友
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摘要
A detailed experimental study of the optical properties in the high-energy region (up to a/lambda=1.8) of high-quality artificial opals is performed by means of reflection and transmission spectroscopy. A number of issues, such as scalability and finite size effects, are taken into account before tentative comparison with theory is carried out. The experimental system under study is further modified by a controlled filling of the interstitials between the spheres, and its optical properties monitored throughout the process. We observe that the main features of the optical response of artificial opals seem to be accounted for by bands originated by wave vectors parallel to the GammaL direction and their perturbations, such as gaps opening at the center and edges of the Brillouin zone and anticrossings elsewhere, introduced through the interaction with other bands of similar energy and symmetry. This work constitutes an experimental approach to understand the interaction of light with photonic bands which introduces a challenge for future experimental and theoretical work.
- 出版日期2004-7
