**16. Patents**

For FP filter arrays, PC sensors and plasmonic sensors, the obvious disadvantage concerning less efficiency in using available light (in comparison to grating spectrometers) can be partly compensated by spectral preselection: R. Brunner, H. Hillmer and A. Gatto: Spektralsensor zur spektralen Analyse einfallenden Lichts, German Patent 2016, DE 10 2014 108 138 B4. Recently, this concept has been proven, experimentally [11,89]. See Section 6.

**Author Contributions:** Conceptualization, H.H., T.K. and R.B.; Methodology, H.H., T.K., R.B., C.W., A.K., M.K. and M.S.Q.I.; Validation, A.K., C.W., A.I., T.K., M.S.Q.I. and H.H.; Formal Analysis, M.S.Q.I., A.K., M.K., H.H. and T.K.; Investigation, A.K., A.I., M.S.Q.I. and C.W.; Writing—Original Draft Preparation, H.H., T.K. and A.K.; Writing—Review and Editing, all authors; Visualization, H.H., T.K., A.I. and A.K.; Funding Acquisition, H.H. and R.B. All authors have read and agreed to the published version of the manuscript.

**Funding:** Financial funding by DFG, BMBF, HA and EU is gratefully acknowledged.

**Institutional Review Board Statement:** Not applicable.

**Informed Consent Statement:** Not applicable.

**Data Availability Statement:** No new data were created or analyzed in this study. Data sharing is not applicable to this article.

**Acknowledgments:** The authors thank S. Irmer, J. Daleiden, C. Prott, F. Römer, A. Hasse, Y. Shen, R. Zamorra, VR. Kolli, M. Strassner, D. T. Nguyen, N. Ahmed, N. Dharmarasu, T. Nurjahan, A. Friedrichsen, I. Kommallein, J. Krumpholz, D. Gutermuth, H. H. Mai, Waleed Al-Esayi, B. Laue, E. Förster, M. Bartels, M. Ababtain, I. Memon, A. Ullah, P. Lehmann, S. Hansmann, M. Verschuuren, M. Hornung and V. Daneker for stimulating discussions, technological processing and technical support.

**Conflicts of Interest:** The authors declare no conflict of interest. The funding agencies had no role in the design, execution, interpretation, or writing of the study.
