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- Publisher Website: 10.1021/acsphotonics.4c00132
- Scopus: eid_2-s2.0-85191811825
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Article: Enhancing Optical Confinement of InGaN Thin-Film Microdisk Lasers with Hybrid Omnidirectional Reflectors
Title | Enhancing Optical Confinement of InGaN Thin-Film Microdisk Lasers with Hybrid Omnidirectional Reflectors |
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Authors | |
Keywords | gallium nitride high Q factor microdisk laser whispering gallery mode |
Issue Date | 23-Apr-2024 |
Publisher | American Chemical Society |
Citation | ACS Photonics, 2024, v. 11, n. 5, p. 1990-1997 How to Cite? |
Abstract | The conventional GaN microdisk laser adopts an undercut structure for the optical confinement, which provides poor overlap between the whispering gallery modes and the multiquantum well gain region. The thin-film microdisk structure was proposed to overcome this shortcoming, but the absorptive nature of the metallic bonding layer with mirror compromises optical confinement. In this work, an SiO2/TiO2 distributed Bragg reflector is integrated with the metallic mirror to form an omnidirectional reflector that provides high optical reflectance across a wide range of incidence angles to promote optical confinement in the microdisk. Optical-pumped lasing with an average lasing threshold power density of 46.5 W/cm2 and Q factors of 18200 (near threshold) is achieved. The narrowest lasing line width of ∼0.02 nm is obtained at the average excitation power density of 48.02 W/cm2, representing a major advancement in the GaN microdisk laser technology. |
Persistent Identifier | http://hdl.handle.net/10722/343735 |
ISSN | 2023 Impact Factor: 6.5 2023 SCImago Journal Rankings: 2.089 |
DC Field | Value | Language |
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dc.contributor.author | Wang, Zhongqi | - |
dc.contributor.author | Cheung, Yuk Fai | - |
dc.contributor.author | Fu, Wai Yuen | - |
dc.contributor.author | Choi, Hoi Wai | - |
dc.date.accessioned | 2024-05-28T09:37:34Z | - |
dc.date.available | 2024-05-28T09:37:34Z | - |
dc.date.issued | 2024-04-23 | - |
dc.identifier.citation | ACS Photonics, 2024, v. 11, n. 5, p. 1990-1997 | - |
dc.identifier.issn | 2330-4022 | - |
dc.identifier.uri | http://hdl.handle.net/10722/343735 | - |
dc.description.abstract | <p>The conventional GaN microdisk laser adopts an undercut structure for the optical confinement, which provides poor overlap between the whispering gallery modes and the multiquantum well gain region. The thin-film microdisk structure was proposed to overcome this shortcoming, but the absorptive nature of the metallic bonding layer with mirror compromises optical confinement. In this work, an SiO<sub>2</sub>/TiO<sub>2</sub> distributed Bragg reflector is integrated with the metallic mirror to form an omnidirectional reflector that provides high optical reflectance across a wide range of incidence angles to promote optical confinement in the microdisk. Optical-pumped lasing with an average lasing threshold power density of 46.5 W/cm<sup>2</sup> and Q factors of 18200 (near threshold) is achieved. The narrowest lasing line width of ∼0.02 nm is obtained at the average excitation power density of 48.02 W/cm<sup>2</sup>, representing a major advancement in the GaN microdisk laser technology.<br></p> | - |
dc.language | eng | - |
dc.publisher | American Chemical Society | - |
dc.relation.ispartof | ACS Photonics | - |
dc.subject | gallium nitride | - |
dc.subject | high Q factor | - |
dc.subject | microdisk laser | - |
dc.subject | whispering gallery mode | - |
dc.title | Enhancing Optical Confinement of InGaN Thin-Film Microdisk Lasers with Hybrid Omnidirectional Reflectors | - |
dc.type | Article | - |
dc.identifier.doi | 10.1021/acsphotonics.4c00132 | - |
dc.identifier.scopus | eid_2-s2.0-85191811825 | - |
dc.identifier.volume | 11 | - |
dc.identifier.issue | 5 | - |
dc.identifier.spage | 1990 | - |
dc.identifier.epage | 1997 | - |
dc.identifier.eissn | 2330-4022 | - |
dc.identifier.issnl | 2330-4022 | - |