Crystalline silicon at a vacuum wavelength of 900 nm
PHYSICS · Multi-part · Fermi University Physics · Optics & Photonics · Condensed Matter, Materials & Soft Matter · Wave propagation and light in media
What an Instrument Can See, Ch The optical constants of a medium
Problem
Crystalline silicon at a vacuum wavelength of 900 nm, just below its band edge, has complex refractive index n~=3.85+0.020i. Idealise a wafer as a plane-parallel slab of this material with negligible reflection loss at its surfaces.
((a)) Find the absorption coefficient α.
((b)) Find the fraction of the incident intensity transmitted through a wafer 10 μm thick.