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Issue 25, 2020
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Control of molecular packing toward a lateral microresonator for microlaser array

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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 subunit fabrication. Herein, we demonstrated a facile method to prepare uniform nanolaser arrays based on a 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). Theoretically, spectroscopic and crystallographic results together reveal that short-axis brickwork-packing and long-axis uniaxial-alignment of 6M-DSB molecules result in a mixed Hj-type aggregation within microribbons. On the one hand, such a kind of Hj-type aggregation exhibits enhanced radiative decay and therefore 100% photoluminescence quantum yield for minimizing the singlet–triplet annihilation and reabsorption of laser photons owing to triplet absorption. On the other hand, the uniaxial alignment gives rise to a transverse lateral FP microresonator along the width of 6M-DSB microribbons, rather than a 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 subunits for integrated organic photonics.

Graphical abstract: Control of molecular packing toward a lateral microresonator for microlaser array

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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, 2020,8, 8531-8537
Article type
Paper

Control of molecular packing toward a lateral microresonator for microlaser array

X. Jin, H. Huang, X. Wang, Q. Liao, W. Hu and H. Fu, J. Mater. Chem. C, 2020, 8, 8531
DOI: 10.1039/D0TC01327G

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