Table 4. Comparison between the fabricated optical filters and some of the commercially available. Data includes filters within the 340nm-750nm range.
| Supplier and filter reference | FWHM (nm) | Transmittance of all filters in range | Filter thickness # | Filter area | Integration in chip ? | Indicative cost /mm2 |
|---|---|---|---|---|---|---|
| Edmund optics Ref: xxx-CWL (*) |
10 ± 2 | ± 85% | 5 mm minimum |
12.5 mm diameter Other areas not available |
No | 1 € |
| Thorlabs Ref: FBxxx-10 (&) |
From 10 to 40 | From 35% to 90% | 6.3 mm minimum |
25.4 mm diameter Other areas not available |
No | 0.1 € |
| Newport Ref: 10BPF10-xxx (§) | From 10 to 70 | From 30% to 60% | 6.3 mm minimum |
25.4 mm diameter Other areas not available |
No | 0.3 € |
| This work – thin-film optical filter | From 10 to 17 | From 56% to 81% | 0.7 mm Any substrate is possible |
Down to 0.1 × 0.1 mm | Yes | 0.07 € |
(*) information available at: http://www.edmundoptics.eu/optics/optical-filters.
(&) information available at: https://www.thorlabs.com.
(§) information available at: http://search.newport.com
# includes glass and optical filter hard coating