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Dye-doped random microlasers fabricated via femtosecond laser-induced two-photon polymerization (Conference Presentation)
Author(s): Nathália B. Tomazio; Lucas F. Sciuti; Gustavo F. B. Almeida; Leonardo De Boni; Cleber R. Mendonça
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Paper Abstract

Lasing action in Random Lasers made of polymers is usually achieved with a spatially distributed feedback, where scattering elements are spread over the active medium as a whole, yet some studies have shown that positive feedback may be provided from diffuse reflections at a scattering surface. Even though the latter has been demonstrated in polymeric films, it has not been shown to occur in on-chip integrated microstructures. Thus, in this paper, we demonstrate lasing action in Rhodamine B-doped polymeric microstructures whose feedback is based on diffuse reflections at the structure sidewall surfaces. The microlasers, produced by means of two-photon polymerization, are polygon-shaped on-chip microstructures featuring good structural quality and low shrinkage. The active material is Rhodamine B, which is homogeneously distributed throughout the structures. By pumping the structures with a ps-laser at 532 nm, a multi-peak emission with no evident spectral periodicity was observed. The peaks are a result of successive diffuse reflections of light at the structure sidewall surfaces that re-enters the gain medium and closes feedback loops with different perimeters and Q-factors. In spite of their omnidirectional emission, the microstructures lasing threshold was found to be on the order of nanojoules, which is comparable to what had been reported for microlasers based on optical resonators. This work therefore provides an easy way of realizing low-threshold random microlasers that hold potential as a solid-state laser source for integrated optics applications

Paper Details

Date Published: 5 March 2019
Proc. SPIE 10915, Organic Photonic Materials and Devices XXI, 109150W (5 March 2019); doi: 10.1117/12.2507650
Show Author Affiliations
Nathália B. Tomazio, Univ. de São Paulo (Brazil)
Lucas F. Sciuti, Univ. de São Paulo (Brazil)
Gustavo F. B. Almeida, Univ. de São Paulo (Brazil)
Leonardo De Boni, Univ. de São Paulo (Brazil)
Cleber R. Mendonça, Univ. de São Paulo (Brazil)

Published in SPIE Proceedings Vol. 10915:
Organic Photonic Materials and Devices XXI
Christopher E. Tabor; François Kajzar; Toshikuni Kaino, Editor(s)

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