Soft‐Lithographed Up‐Converted Distributed Feedback Visible Lasers Based on CdSe–CdZnS–ZnS Quantum Dots |
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| Authors: | Francesco Todescato Ilaria Fortunati Samuele Gardin Eleonora Garbin Elisabetta Collini Renato Bozio Jacek J. Jasieniak Gioia Della Giustina Giovanna Brusatin Stefano Toffanin Raffaella Signorini |
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| Affiliation: | 1. Department of Chemical Science and U.R. INSTM, University of Padova, Via Marzolo 1, I‐35131, Padova, Italy;2. CSIRO Division of Materials Science and Engineering Ian Wark Laboratory, Bayview Avenue, Clayton 3168, Australia;3. Department of Mechanical Engineering, Materials Section and U.R. INSTM, University of Padova, Via Marzolo 9, I‐35131 Padova, Italy;4. CNR, ISMN, Via Gobetti 101, I‐40129 Bologna, Italy |
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| Abstract: | The development of a solution‐deposited up‐converted distributed feedback laser prototype is presented. It employs a sol–gel silica/germania soft‐lithographed microcavity and CdSe–CdZnS–ZnS quantum dot/sol–gel zirconia composites as optical gain material. Characterization of the linear and nonlinear optical properties of quantum dots establishes their high absorption cross‐sections in the one‐ and two‐ photon absorption regimes to be 1 × 10?14 cm2 and 5 × 104 GM, respectively. In addition, ultrafast transient absorption dynamics measurements of the graded seal quantum dots reveal that the Auger recombination lifetime is 220 ps, a value two times higher than that of the corresponding CdSe core. These factors enable the use of such quantum dots as optically pumped gain media, operating in the one‐ and two‐photon absorption regime. The incorporation of CdSe–CdZnS–ZnS quantum dots within a zirconia host matrix affords a quantum‐dot ink that can be directly deposited on our soft‐lithographed distributed feedback grating to form an all‐solution‐processed microcavity laser. |
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| Keywords: | quantum dots amplified spontaneous emission imprinting distributed feedback up‐converted lasing |
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