Germanium FCC structure from a colloidal crystal template
Here, the authors show a method to fabricate a macroporous structure in which the pores, essentially identical, arrange regularly in a face-centered cubic (FCC) lattice. The result is a network of air spheres in a germanium medium. This structure presents the highest dielectric contrast ({epsilon}{sub Ge}/{epsilon}{sub air} = 16) ever achieved in the optical regime in such periodic structures, which could result in important applications in photonics. The authors employ solid silica colloidal crystals (opals) as templates within which a cyclic germanium growth process is carried out. Thus, the three-dimensional periodicity of the host is inherited by the guest. Afterward, the silica is removed and a germanium opal replica is obtained.
- Research Organization:
- Univ. Politecnica de Valencia (ES)
- OSTI ID:
- 20080273
- Journal Information:
- Langmuir, Journal Name: Langmuir Journal Issue: 10 Vol. 16; ISSN LANGD5; ISSN 0743-7463
- Country of Publication:
- United States
- Language:
- English
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