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Standard test sample for Scanning Near Field Optical Microscope

Grating description

Substrate:

quartz (0,5 mm thickness)

Substrate size:

10x10mm

Rhomb material:

vanadium 

Thickness of vanadium layer

about 20-30 nm

Active area:

central diameter 3 mm array

Transmission coefficient through metal coating (rhomb)

< 20%

Reflection coefficient from metal coating (rhomb)

> 40%

R curvature of rhomb

< 50 nm