Ultralow-threshold and high-quality whispering-gallery-mode lasing from colloidal core/hybrid-shell quantum wells
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 dro...
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Science::Physics::Optics and light Colloidal Quantum Wells Compositional Engineering Whispering Gallery Modes Single-Mode Lasing Ultralow Threshold Lasing Monolithic Microcavity |
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Science::Physics::Optics and light Colloidal Quantum Wells Compositional Engineering Whispering Gallery Modes Single-Mode Lasing Ultralow Threshold Lasing Monolithic Microcavity Duan, Rui Zhang, Zitong Xiao, Lian Zhao, Xiaoxu Thung, Yi Tian Ding, Lu Liu, Zheng Yang, Jun Ta, Van Duong Sun, Handong Ultralow-threshold and high-quality whispering-gallery-mode lasing from colloidal core/hybrid-shell quantum wells |
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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- x Znx S 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. |
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School of Physical and Mathematical Sciences |
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School of Physical and Mathematical Sciences Duan, Rui Zhang, Zitong Xiao, Lian Zhao, Xiaoxu Thung, Yi Tian Ding, Lu Liu, Zheng Yang, Jun Ta, Van Duong Sun, Handong |
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Duan, Rui Zhang, Zitong Xiao, Lian Zhao, Xiaoxu Thung, Yi Tian Ding, Lu Liu, Zheng Yang, Jun Ta, Van Duong Sun, Handong |
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Duan, Rui |
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Ultralow-threshold and high-quality whispering-gallery-mode lasing from colloidal core/hybrid-shell quantum wells |
title_short |
Ultralow-threshold and high-quality whispering-gallery-mode lasing from colloidal core/hybrid-shell quantum wells |
title_full |
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 |
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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 |
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2022 |
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https://hdl.handle.net/10356/156063 |
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sg-ntu-dr.10356-1560632023-02-28T20:03:13Z Ultralow-threshold and high-quality whispering-gallery-mode lasing from colloidal core/hybrid-shell quantum wells Duan, Rui Zhang, Zitong Xiao, Lian Zhao, Xiaoxu Thung, Yi Tian Ding, Lu Liu, Zheng Yang, Jun Ta, Van Duong Sun, Handong School of Physical and Mathematical Sciences School of Materials Science and Engineering School of Electrical and Electronic Engineering CNRS International NTU THALES Research Alliances Science::Physics::Optics and light Colloidal Quantum Wells Compositional Engineering Whispering Gallery Modes Single-Mode Lasing Ultralow Threshold Lasing Monolithic Microcavity 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- x Znx S 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. Ministry of Education (MOE) Nanyang Technological University National Research Foundation (NRF) Submitted/Accepted version R. Duan and Z. T. Zhang contributed equally to this work. This work is supported by NRF-CRP21-2018-0007, NRF-CRP23-2019-0007 and AME-IRG- A20E5c0083. The electron microscopy imaging was performed at the Facility for Analysis, Characterization, Testing, and Simulation (FACTS) at Nanyang Technological University, Singapore. J. Y. also acknowledges the support from the National Science Fund for Distinguished Young Scholars of China (61925501), the Guangdong Introducing Innovative and Enterpreneurial Teams (2019ZT08X340) and Introducing Leading Talents (2019CX01X010) of “The Pearl River Talent Recruitment Program” of Guangdong Province. X.X.Z. thanks the support from the Presidential Postdoctoral Fellowship, Nanyang Technological University, Singapore via grant 03INS000973C150. 2022-04-04T07:20:54Z 2022-04-04T07:20:54Z 2022 Journal 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-. https://dx.doi.org/10.1002/adma.202108884 0935-9648 https://hdl.handle.net/10356/156063 10.1002/adma.202108884 34997633 2-s2.0-85123780458 13 34 2108884 en NRF-CRP21-2018-0007 NRF-CRP23-2019-0007 AME-IRG-A20E5c0083 03INS000973C150. MOE2018-T3-1-002 RG7/18 NRF2020-NRF-ISF004-3520 Advanced Materials 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-, which has been published in final form at https://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. application/pdf |