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Table 1 Derived focusing performance for different cases of the lens spacing

From: Broadband Metallic Planar Microlenses in an Array: the Focusing Coupling Effect

Spacing a (μm)

Focal length (μm)

FWHM (μm)

DOF (μm)

I max (a.u.)

0

1.204

0.62

1.919

1.226

1

1.375

0.66

2.090

1.544

2

1.545

0.72

2.559

1.395

3

1.545

0.70

2.132

1.435

4

1.503

0.72

2.474

1.349

Isolated lens

1.509

0.72

2.317

1.374

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