Biomedical Engineering Reference
In-Depth Information
coded channel scenario of the modern battlefield, and in the complexity of
the international and satellite audio and visual communications [8]. These
structures are extremely important from the stand point of basic science
because their submicron geometry necessitates altering the traditional,
mathematical, and physical analysis.
The material quality and critical fabrication tolerances afforded through
MOCVD and the MBE permit fabrication of single crystals with nanometer
dimensions and ultimately single monatomic layers. This gives rise to previ-
ously unexplored conditions such as ellipsoidal symmetry of the exciton and
layer thicknesses less than the mean free path of the electron, and hence effects
such as exciton stability at room temperature and ballistic tunneling of electrons
and hot electrons. These effects will ultimately be implemented in a guided-
wave integrated format, affording improved optical system performance.
20
19
18
17
16
15
Kuznetsov
14
13
Marcatili
12
11
10
9
8
7
λ
0
= 3.4 µm
a
=
b
= 7.5 µm
N
D
= 5 ×10
17
cm
-3
α ~ 0.27 dB cm
-1
6
5
4
Parallel channel
directional coupler
L
versus
C
3
2
1
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
(b)
C
(µm)
FIGURE 5.14 (continued)
(b) λ
0
= 3.4 μm;
a = b
= 7.5 μm;
N
D
= 5 × 10
17
cm
−3
; α ∼ 0.27 db cm
−1
parallel direction channel direc-
tional coupler
L
versus
C
.
(
continued
)
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