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dc.contributor.authorCheng, Pi-Juen_US
dc.contributor.authorLai, Ming-Shengen_US
dc.contributor.authorHsiao, Yu-Haoen_US
dc.contributor.authorYu, Cheng-Lien_US
dc.contributor.authorChang, Chiao-Yunen_US
dc.contributor.authorHsieh, Chi-Tien_US
dc.contributor.authorLin, Chih-Hsienen_US
dc.contributor.authorShih, Min-Hsiungen_US
dc.contributor.authorKuo, Hao-Chungen_US
dc.contributor.authorChang, Shu-Weien_US
dc.date.accessioned2019-08-02T02:24:16Z-
dc.date.available2019-08-02T02:24:16Z-
dc.date.issued2019-01-01en_US
dc.identifier.isbn978-1-5106-2467-2en_US
dc.identifier.issn0277-786Xen_US
dc.identifier.urihttp://dx.doi.org/10.1117/12.2507979en_US
dc.identifier.urihttp://hdl.handle.net/11536/152437-
dc.description.abstractIn this work, we present the model of plasmonic chrial nanolasers composed of aluminum-coated gallium-nitride (GaN) gammadions, which may lase with a high degree of circular polarization at room temperatures. Using the finite-element method, we examine resonant modes of the four-fold rotationally symmetric cavities of gammadions whose resonant frequencies lie in the gain spectrum of GaN. We find a degenerate doublet of resonant modes which can couple to plane waves in the far-field zone above gammadions. Their near-field profiles exhibit localized distribution in the arms of gammadions and a Fabry-Perot standing-wave pattern along the post. In practice, fabrication imperfections would inevitably spoil the four-fold rotation symmetry of gammadions. Typical perturbation could lift the degeneracy of doublet and leads to mixing of the two degenerate modes which may still output signals with observable handedness above gammadions. Considering a gammadion cavity with a single elongated arm, we show that the magnitude of dissymmetry factor of its resonant mode can be larger than unity. Our calculations are consistent with the experimental results, indicating that the right-handed gammadion cavities lase with a magnitude of dissymmetry factors near 1 at a wavelength of 364 nm. The dimensionless effective mode volume scaled by the cube of effective wavelength is 2.62, reflecting a modal distribution remarkably confined in the plasmonic structures and the capability of enhancing the spontaneous-emission rate noticeably. These chiral nanolasers with an ultrasmall footprint could be potentially utilized as future circularly-polarized photon source at the chip level.en_US
dc.language.isoen_USen_US
dc.subjectNanolaseren_US
dc.subjectPlasmonicsen_US
dc.subjectCircular Dichroismen_US
dc.titleCircularly-polarized lasing of ultraviolet plasmonic gammadion nanocavityen_US
dc.typeProceedings Paperen_US
dc.identifier.doi10.1117/12.2507979en_US
dc.identifier.journalPHYSICS AND SIMULATION OF OPTOELECTRONIC DEVICES XXVIIen_US
dc.citation.volume10912en_US
dc.citation.spage0en_US
dc.citation.epage0en_US
dc.contributor.department光電工程學系zh_TW
dc.contributor.department光電工程研究所zh_TW
dc.contributor.departmentDepartment of Photonicsen_US
dc.contributor.departmentInstitute of EO Enginerringen_US
dc.identifier.wosnumberWOS:000468820500026en_US
dc.citation.woscount0en_US
Appears in Collections:Conferences Paper