Ultralow‐Threshold and High‐Quality Whispering‐Gallery‐Mode Lasing from Colloidal Core/Hybrid‐Shell Quantum Wells

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Ultralow‐Threshold and High‐Quality Whispering‐Gallery‐Mode Lasing from Colloidal Core/Hybrid‐Shell Quantum Wells
Title:
Ultralow‐Threshold and High‐Quality Whispering‐Gallery‐Mode Lasing from Colloidal Core/Hybrid‐Shell Quantum Wells
Other Titles:
Advanced Materials
Publication Date:
07 January 2022
Citation:
Duan, R., Zhang, Z., Xiao, L., Zhao, X., Thung, Y. T., Ding, L., Liu, Z., Yang, J., Ta, V. D., & Sun, H. (2022). Ultralow‐Threshold and High‐Quality Whispering‐Gallery‐Mode Lasing from Colloidal Core/Hybrid‐Shell Quantum Wells. Advanced Materials, 34(13), 2108884. Portico. https://doi.org/10.1002/adma.202108884
Abstract:
The realization of efficient on-chip microlasers with scalable fabrication, ultralow threshold, and stable single-frequency operation is always desired for a wide range of miniaturized photonic systems. Herein, an effective way to fabricate nanostructures- whispering-gallery-mode (WGM) lasers by drop-casting CdSe/CdS@Cd1−xZnxS core/buffer-shell@graded-shell nanoplatelets (NPLs) dispersion onto silica microspheres is presented. Benefiting from the excellent gain properties from the interface engineered core/hybrid shell NPLs and high-quality factor WGM resonator from excellent optical field confinement, the proposed room-temperature NPLs-WGM microlasers show a record-low lasing threshold of 3.26 µJ cm−2 under nanosecond laser pumping among all colloidal NPLs-based lasing demonstrations. The presence of sharp discrete transverse electric- and magnetic-mode spikes, the inversely proportional dependence of the free spectra range on microsphere sizes and the polarization anisotropy of laser output represent the first direct experimental evidence for NPLs-WGM lasing nature, which is verified theoretically by the computed electric-field distribution inside the microcavity. Remarkably, a stable single-mode lasing output with an ultralow lasing threshold of 3.84 µJ cm−2 is achieved by the Vernier effect through evanescent field coupling. The results highlight the significance of interface engineering on the optimization of gain properties of heterostructured nanomaterials and shed light on developing future miniaturized tunable coherent light sources.
License type:
Publisher Copyright
Funding Info:
This research / project is supported by the National Research Foundation - Competitive Research Programme
Grant Reference no. : NRF-CRP21-2018-0007

This research / project is supported by the National Research Foundation - Competitive Research Programme
Grant Reference no. : NRF-CRP23-2019-0007

This research / project is supported by the A*STAR - Advanced manufacturing programme -individual research grant
Grant Reference no. : A20E5c0083

Overseas Funding:- National Science Fund for Distinguished Young Scholars of China 10 (61925501), the Guangdong Introducing Innovative and Enterpreneurial Teams (2019ZT08X340) and Introducing Leading Talents (2019CX01X010) of “The Pearl River Talent Recruitment Program” of Guangdong Province
Description:
This is the peer reviewed version of the following article: Duan, R., Zhang, Z., Xiao, L., Zhao, X., Thung, Y. T., Ding, L., Liu, Z., Yang, J., Ta, V. D., & Sun, H. (2022). Ultralow‐Threshold and High‐Quality Whispering‐Gallery‐Mode Lasing from Colloidal Core/Hybrid‐Shell Quantum Wells. Advanced Materials, 34(13), 2108884. Portico. https://doi.org/10.1002/adma.202108884, which has been published in final form at doi.org/10.1002/adma.202108884. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions. This article may not be enhanced, enriched or otherwise transformed into a derivative work, without express permission from Wiley or by statutory rights under applicable legislation. Copyright notices must not be removed, obscured or modified. The article must be linked to Wiley’s version of record on Wiley Online Library and any embedding, framing or otherwise making available the article or pages thereof by third parties from platforms, services and websites other than Wiley Online Library must be prohibited
ISSN:
0935-9648
1521-4095
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