Single-crystal – oriented-crystal – and epitaxy growth processes; – Processes of growth from liquid or supercritical state – Liquid phase epitaxial growth
Patent
1994-06-27
1997-07-29
Breneman, R. Bruce
Single-crystal, oriented-crystal, and epitaxy growth processes;
Processes of growth from liquid or supercritical state
Liquid phase epitaxial growth
117 74, 117 81, 117 95, 372 39, 372 43, C30R 1700
Patent
active
056518188
ABSTRACT:
The invention concerns materials which exhibit photonic band gaps in the near infrared and visible regions of the optical spectrum and methods of preparation of such materials.
The materials manufactured according to the invention are particularly suitable for use in the optical analog to semiconductor behavior, in which a photonic band gap material, or a plurality of such materials acting in concert, can be made to interact with and control light wave propagation in a manner analogous to the way that semiconductor materials can be made to interact with and control the flow of electrically charged particles, i.e., electricity, in both analog and digital applications.
According to the invention it is possible to fabricate a photonic band gap material by impregnating the pores or voids contained within the volume of a specially prepared reticulated mesh, which may be made of a material with a high melting temperature such as a metal, with liquid material which melts at a temperature lower than the melting temperature of the reticulated mesh and which solidifies upon cooling. The reticulated mesh is then dissolved by simple chemical action in a liquid bath, leaving behind a solid reticulated structure composed of the solidified liquid material. In particular, the liquid material may be caused to solidify into an ordered solid such as a single crystal by the imposition of either or both a thermal gradient or a seed single crystal of the same or a closely related material.
REFERENCES:
patent: 5335240 (1994-08-01), Ho et al.
patent: 5365541 (1994-11-01), Bullock
patent: 5385114 (1995-01-01), Milstein et al.
Milstein Joseph B.
Roy Ronald G.
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