Ocean Optics NanoCalc - Manual (Page 78)

Ocean Optics Germany GmbH Thin Film Metrology
77
Example II: Transparent Samples
Nb
2
O
5
on Glass (Borosilicate 40)
a.)
RTL-Stage (Reflectance mode)
Please accept that Nb
2
O
5
has a higher reflectivity than glass without coating, therefore we have to adjust the
integration time with the substrate plus layer first and take the reference from the substrate without any
changes.
Put the Nb
2
O
5
glass onto the RTL-Stage. We need a light trap (black absorber material) behind the glass
material, to prevent reflections or ambient light.
Click on the button "continuous mode" and then the button “reference” (both turn red).
Adjust the fiber distance between sample and fiber in that way that you get the highest possible signal. A
typical distance is 1-5 mm
Now adjust the integration time in that way that the Max-Level is around 0.8
Now put the reference glass (BK7) on the table.
Click the button "reference".
Now you are ready to measure, but every time we have to go to the menu Edit layer structure first.
Lighttrap
Sample (Nb
2
O
5
rosilicat40)
Fiber
RTL-Stage