Table 2.
Tuneable focusing characteristics of the USSL
| Design | Experimental results | ||||||
|---|---|---|---|---|---|---|---|
| USSL | Focal spot distance (LSSL–RSSL) (df, μm) | Focal spot position shift (Δc, μm) | Focal length shift (Δf, μm) | Focal length (f, μm) | Focusing efficiency (%) | ||
| 0 V | 50 V | ||||||
| Red | 44.7 | 44.5 | 45.5 | 0.50 | 26.2 | 210 | 62.79 |
| Green | 44.7 | 44.4 | 45.9 | 0.75 | 36.9 | 190 | 60.11 |
| Blue | 44.7 | 44.5 | 45.4 | 0.45 | 16.4 | 150 | 64.84 |
Focal length, focusing efficiency, and focal spot distance variation, focal spot position shift and focal length shift at the focal plane of the ETF-USSL with an applied voltage for the wavelength-dependent design of the arc ribbon USSL array with additional electrodes based on the packed pattern (Fig. 5)