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Proceedings Paper

On-demand micro-optics using single-shot laser additive manufacturing (Conference Presentation)
Author(s): Marti Duocastella; Salvatore Surdo; Alberto Diaspro

Paper Abstract

Micro-optics have emerged as a cost-effective solution for increasing the photon collection efficiency of optoelectronic systems. By placing a microlens or microlens array (MLA) on top of the active area of a solar cell or photodetector, sustained improvements of up to 50% in the quantum efficiency of these devices have been demonstrated. However, current fabrication technologies for micro-optics can be limited in throughput, attainable geometries, fill-factor (FF) or range of suitable substrates. In this talk, I will present laser catapulting (LCP), a novel maskless laser additive manufacturing technique capable of customized and in-situ fabrication of polymeric micro-lenses over planar, curved and flexible substrates. LCP is based on a two-step process. First, a single laser shot is used to transfer a microdisk from a solid donor film directly to the area of interest on the optoelectronic device. Second, a thermal reflow process converts the disks into high-quality microlenses that exhibit almost perfect smoothness. Notably, closely packed MLA with a 100% FF can be obtained, not possible with standard direct-write methods such as inkjet printing or microdispensing. Furthermore, precise, accurate and high-throughput fabrication of lenses with different focusing power and geometries –spherical, cylindrical or even triangular – can be realized by simply adjusting laser parameters such as laser fluence or beam shape. I will present an in-depth experimental characterization of LCP, discuss the advantages and pitfalls of this technology and illustrate them with several applications, including enhancing the performance of single-photon avalanche diode (SPAD) arrays for super-resolution microscopy.

Paper Details

Date Published: 18 October 2019
Proc. SPIE 11168, Advanced Manufacturing Technologies for Micro- and Nanosystems in Security and Defence II, 111680G (18 October 2019); doi: 10.1117/12.2533643
Show Author Affiliations
Marti Duocastella, Istituto Italiano di Tecnologia (Italy)
Salvatore Surdo, Istituto Italiano di Tecnologia (Italy)
Alberto Diaspro, Istituto Italiano di Tecnologia (Italy)

Published in SPIE Proceedings Vol. 11168:
Advanced Manufacturing Technologies for Micro- and Nanosystems in Security and Defence II
Andrea Camposeo; Yuris Dzenis; Maria Farsari; Luana Persano, Editor(s)

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