Growth of 3D photonic crystals by photolysis of CrO 2 Cl 2
A method of three-dimensional (3D) holography is used for the growth of photonic crystals of sub-micron cell parameters by gas decomposition in a 3D interference field of UV laser light. Either amorphous or crystalline chromium oxides are obtained by photolysis of chromyl chloride CrO 2 Cl 2 for dif...
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Published in | Journal of crystal growth Vol. 311; no. 8; pp. 2590 - 2596 |
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Main Authors | , , , |
Format | Journal Article |
Language | English |
Published |
Elsevier B.V
2009
|
Subjects | |
Online Access | Get full text |
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Summary: | A method of three-dimensional (3D) holography is used for the growth of photonic crystals of sub-micron cell parameters by gas decomposition in a 3D interference field of UV laser light. Either amorphous or crystalline chromium oxides are obtained by photolysis of chromyl chloride
CrO
2
Cl
2
for different experimental conditions. The most interesting product is obtained for a photolysis of
CrO
2
Cl
2
at low pressure, on a cooled
TiO
2
single-crystal substrate and for a higher beam energy. The growth begins with the formation of epitaxial
CrO
2
metastable phase which is partly transformed into
Cr
2
O
3
under UV irradiation. Due to crystallographic orientational relationships between
CrO
2
and
Cr
2
O
3
, the growth of a well organized 3D photonic crystal of
Cr
2
O
3
phase goes on according to the 3D periodic modulations of electromagnetic energy of the interference field. In the present case, the
Cr
2
O
3
phase exhibits four sets of equivalent crystallographic orientations with respect to the single-crystal substrate. From such a result, one can expect to produce in a further work photonic crystals constituted of single-crystalline
Cr
2
O
3
phase in epitaxy onto a
Cr
2
O
3
or sapphire
Al
2
O
3
substrate. |
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ISSN: | 0022-0248 1873-5002 |
DOI: | 10.1016/j.jcrysgro.2009.02.008 |