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GT7 · SiO2 Color Chart
|
Film Thickness (Å) |
Color of Film (those shown are only indicative) |
|
500 |
tan |
|
700 |
brown |
|
1000 |
dark violet to red violet |
|
1200 |
royal blue |
|
1500 |
light blue to metallic blue |
|
1700 |
metallic to very light yellow-green |
|
2000 |
light gold or yellow - slightly metallic |
|
2200 |
gold with slight yellow-orange |
|
2500 |
orange to melon |
|
2700 |
red-violet |
|
3000 |
blue to violet-blue |
|
3100 |
blue |
|
3200 |
blue to blue-green |
|
3400 |
light green |
|
3500 |
green to yellow-green |
|
3600 |
yellow-green |
|
3700 |
green-yellow |
|
3900 |
yellow |
|
4100 |
light orange |
|
4200 |
carnation pink |
|
4400 |
violet-red |
|
4600 |
red-violet |
|
4700 |
violet |
|
4800 |
blue-violet |
|
4900 |
blue |
|
5000 |
blue-green |
|
5200 |
green |
|
5400 |
yellow-green |
|
5600 |
green-yellow |
|
5700 |
yellow to “yellowish” (at times appears light gray or metallic) |
|
5800 |
light orange or yellow to pink |
|
6000 |
carnation pink |
|
6300 |
violet-red |
|
6800 |
“bluish” (appears between violet-red and blue-green - overall looks
grayish |
|
7200 |
blue-green to green |
|
7700 |
“yellowish” |
|
8000 |
orange |
|
8200 |
salmon |
|
8500 |
dull light red-violet |
|
8600 |
violet |
|
8700 |
blue-violet |
|
8900 |
blue |
|
9200 |
blue-green |
|
9500 |
dull yellow-green |
|
9700 |
yellow to “yellowish” |
|
9900 |
orange |
The color table is
a subjective table based on vertical viewing under fluorescent
light.
Note the cyclical reappearance of the colors as thickness increases. For example,
compare 1000,2700, 4600, and 6300Å.
The appearance of color is due to the constructive and destructive interference
of light. The wavelengths of light in SiO2 which undergo destructive
interference is given by:
Where:
λ = wavelength
t = oxide thickness
k = 0, 1, 2, ... (and which give solutions in the visible light spectrum)
The color of light seen is the eyes response to the amplitude of the wavelengths
remaining.
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