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Control of Molecular Packing toward Lateral Microresonator for Microlaser Array

Abstract

Nanowire laser arrays for integrated on-chip optical interconnects demand the uniformity of lasing wavelengths from different modules, which, however, is challenging owing to inevitable heterogeneity in sub-unit fabrication. Herein, we demonstrated a facile method to prepare uniform nanolaser arrays based on transverse lateral Fabry-Pérot (FP) microresonator built within single-crystalline organic microribbons of 1,4-bis((E)-2,4-dimethylstyryl)-2,5-dimethylbenzene (6M-DSB). Theoretical, spectroscopic and crystallographic results together reveal that short-axis brickwork-packing and long-axis uniaxial-alignment of 6M-DSB molecules results in a mixed Hj-type aggregation within microribbons. On the one hand, such kind of Hj-type aggregation exhibits enhanced radiative decay and therefore 100% photoluminescence quantum yield for minimizing the singlet-triplet annihilation and re-absorption of laser photons owing to triplet absorption. On the other hand, the uniaxial-alignment gives rise to transverse lateral FP microresonator along the width of 6M-DSB microribbons, rather than longitudinal microresonator in conventional nanowire lasers. By positioning a microribbon onto a PDMS pad with patterned grooves, only the suspended parts support transverse waveguiding and high quality FP resonances. A proof-of-concept 1×4 transverse nanolaser array constructed from the same microribbon was demonstrated with almost identical lasing thresholds, wavelengths and FP resonances, providing coupled lasing sub-units for integrated organic photonics.

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Supplementary files

Article information


Submitted
14 Mar 2020
Accepted
09 May 2020
First published
11 May 2020

J. Mater. Chem. C, 2020, Accepted Manuscript
Article type
Paper

Control of Molecular Packing toward Lateral Microresonator for Microlaser Array

X. Jin, H. Huang, X. Wang, Q. Liao, W. Hu and H. Fu, J. Mater. Chem. C, 2020, Accepted Manuscript , DOI: 10.1039/D0TC01327G

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