Miniature freeform flow-line lightguide for sensing: from design to fabrication

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Samenvatting

We present the development of a compact (about 1.3 x 2.0 x 20 mm(3)) freeform optical lightguide for sensing applications, from the conceptual design to the fabrication through injection molding. The design of the optic is based on the flow-line method from Nonimaging Optics, which allows the desired optical functionalities (45 degrees half-acceptance and 40 degrees beam steering) while meeting particularly tight mechanical and geometrical constraints. An extensive analysis of the effects of fabrication parameters on the performances demonstrates the importance of minimizing the fillet radius. This requisite inspired a special procedure for designing the mold, which is built as a "3D puzzle" assembly of separate pieces, each one dedicated to one specific side surface of the lightguide. This technique enables uniform optical quality on all the optic's surfaces and removes the need of a fillet radius in the mold. At present, the first lightguide prototypes have been fabricated; after the coating phase, they will be ready for the validation stage. (C) 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
Originele taal-2English
Pagina's (van-tot)38001-38013
Aantal pagina's13
TijdschriftOptics Express
Volume29
Nummer van het tijdschrift23
DOI's
StatusPublished - 8 nov 2021

Bibliografische nota

Funding Information:
Funding. Agentschap Innoveren en Ondernemen (HBC.2017.0699); Fonds Wetenschappelijk Onderzoek (I013918N); Interreg (Fotonica Pilootlijnen, NWE758); Flanders Make; Methusalem Foundation; EU COST Action CA19111; Industrial Research Fund IOF; OZR of the Vrije Universiteit Brussel.

Publisher Copyright:
© 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement

Copyright:
Copyright 2021 Elsevier B.V., All rights reserved.

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