Table 1 Geometric parameters of the seven optimized designs of axially symmetric polymer structures resulting from the optimization for the different target angles (λ0 = 1.55 μm)

From: Fiber-based angular demultiplexer using nanoprinted periodic structures on single-mode multicore fibers

θ−1

Λ [μm]

r0 [μm]

w [μm]

h [μm]

N

ηsim (θ−1)

ηexp (θ−1)

20°

4.4

3

2.2

1.1

4

3.8%

3.6%

30°

3

2

1.5

1.5

5

2.6%

2%

40°

2.41

1.5

1.21

1.69

5

2.2%

1.4%

50°

2.05

1.2

1.03

1.44

5

1.4%

1%

60°

1.78

1.1

0.89

1.25

6

1%

0.6%

70°

1.65

1.05

0.83

1.15

6

0.9%

0.25%

80°

1.54

0.95

0.77

1.23

6

0.7%

0.075% (0.1% at 75°)

  1. The two columns on the right show the values of the simulated and measured normalized coupling efficiencies.
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