Are artificial opals non-close-packed fcc structures?

F. García-Santamaría, P. V. Braun

Research output: Contribution to journalArticlepeer-review


The authors report a simple experimental method to accurately measure the volume fraction of artificial opals. The results are modeled using several methods, and they find that some of the most common yield very inaccurate results. Both finite size and substrate effects play an important role in calculations of the volume fraction. The experimental results show that the interstitial pore volume is 4%-15% larger than expected for close-packed structures. Consequently, calculations performed in previous work relating the amount of material synthesized in the opal interstices with the optical properties may need revision, especially in the case of high refractive index materials.

Original languageEnglish (US)
Article number241905
JournalApplied Physics Letters
Issue number24
StatePublished - 2007
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)


Dive into the research topics of 'Are artificial opals non-close-packed fcc structures?'. Together they form a unique fingerprint.

Cite this