GATE ECE · 2019 · EC
Question 48: Energy bands
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Question 48
ECNAT2 marksNeeds review
A Germanium sample of dimensions
is illuminated with a 20 mW, 600 nm laser light source as shown in the figure. The illuminated sample surface has a 100 nm of loss-less Silicon dioxide layer that reflects one-fourth of the incident light. From the remaining light, one-third of the power is reflected from the Silicon dioxide-Germanium interface, one-third is absorbed in the Germanium layer, and one-third is transmitted through the other side of the sample. If the absorption coefficient of Germanium at 600 nm is
and the bandgap is 0.66 eV, the thickness of the Germanium layer, rounded off to 3 decimal places, is ______
m. 
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2019EC
GATE ECE 2019 · Paper 1
Electronics and Communication Engineering · Original paper archive
- Section
- Electronics and Communication Engineering
- Question type
- Numerical answer (NAT)
- Marks
- 2 marks
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