Several applications of optical tunneling (frustrated total reflection) are briefly discussed. There are several classes of optical bandpass filters which use optical tunneling: the Fabry-Perot filter (alias the FTR filter), the single tunnel layer filter, and the multiple tunnel layer filter. The properties of these filters are examined. The multiple tunnel layer filter shows promise as an ir long-wave pass filter.
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Refractive index of incident medium, emergent medium
1.72
1.72
1.72
1.72
Layer 1, physical thickness, index
—
0.20
0.18
0.18
1.35
1.35
1.38
1.38–j0.01
Layer 2, quarter-wave optical thickness, index
—
—
1.837
1.837
—
—
2.30
2–30
Layer 3, physical thickness, index
—
—
0.18
0.18
—
—
1.38
1.38–j0.01
The thicknesses are in microns, except for Fig. 4, which is in wavelengths.
Table II
The Design of Kard’s Fabry-Perot Tunnel Layer Filtera
Layer
Thickness
Refractive index
1
2.473
1.550
2
0.308
1.380
3
2.473
1.550
4
4.116
1.720
5
2.473
1.550
6
0.308
1.380
7
2.473
1.550
The thickness of the layers is in quarter-wave optical thickness, except for layers 2 and 6, which are expressed in geometrical thickness. The refractive index of the incident medium and emergent medium is 1.72.
Table III
The Design of the Multilayers Whose Transmittance Curves Are Shown in Figs. 13–15, 18, and 19a
Refractive index of incident medium, emergent medium
1.70
2.67
In the design for Figs. 13et al., the thickness of the films is in quarter-waves at λ0 with the exception of layer 11, which has a physical thickness of one-third of a wave. For Fig. 15, the optical constant of layer 11 is n = n − jk = 1.35 − j0.01. In the design for Figs. 18 and 19, the thickness of the odd-number layers (of index 1.463) is in physical thickness, in microns. The thickness of the even-numbered layers (of index 1.90) is in quarter-wave optical thickness, in microns.
Tables (3)
Table I
The Design of Tunnel Layer Filters Whose Spectral Transmittance Curves Are Shown in Figs. 3, 4, 6, and 8a
Refractive index of incident medium, emergent medium
1.72
1.72
1.72
1.72
Layer 1, physical thickness, index
—
0.20
0.18
0.18
1.35
1.35
1.38
1.38–j0.01
Layer 2, quarter-wave optical thickness, index
—
—
1.837
1.837
—
—
2.30
2–30
Layer 3, physical thickness, index
—
—
0.18
0.18
—
—
1.38
1.38–j0.01
The thicknesses are in microns, except for Fig. 4, which is in wavelengths.
Table II
The Design of Kard’s Fabry-Perot Tunnel Layer Filtera
Layer
Thickness
Refractive index
1
2.473
1.550
2
0.308
1.380
3
2.473
1.550
4
4.116
1.720
5
2.473
1.550
6
0.308
1.380
7
2.473
1.550
The thickness of the layers is in quarter-wave optical thickness, except for layers 2 and 6, which are expressed in geometrical thickness. The refractive index of the incident medium and emergent medium is 1.72.
Table III
The Design of the Multilayers Whose Transmittance Curves Are Shown in Figs. 13–15, 18, and 19a
Refractive index of incident medium, emergent medium
1.70
2.67
In the design for Figs. 13et al., the thickness of the films is in quarter-waves at λ0 with the exception of layer 11, which has a physical thickness of one-third of a wave. For Fig. 15, the optical constant of layer 11 is n = n − jk = 1.35 − j0.01. In the design for Figs. 18 and 19, the thickness of the odd-number layers (of index 1.463) is in physical thickness, in microns. The thickness of the even-numbered layers (of index 1.90) is in quarter-wave optical thickness, in microns.