Page 367 - Introduction to Information Optics

352 6. Interconnection with Optics

6.6 The figure below shows a structure of a multilayer optical interconnect
The output power of the VCSEL is p 0, the power of the light coupled into
the waveguide n 1 through the 45° mirror m l is p t , and p 2 is the light
power coupled into waveguide n 2 through mirror m 2. The refractive index
and thickness of each layer are shown in the figure. Design a structure so
that pjp 0 = 20% and p 2/p 0 = 50%.

T

VCSEL

6.7 Find the atomic density for the zinc-blende silicon. The crystal lattice of
silicon is the face-centered cubic (FCC) illustrated in the figure below.
The lattice constant of silicon at room temperature is 5.43 A. Though
different sizes and colors are used for the sphere for illustration purposes,
they actually represent the same kind of silicon atoms.

Find the surface atomic density for the (100) plane of zinc-blende silicon
(illustrated below).