Analyzing random lasing spectra of the zinc oxide bulk and the multiple quantum wells by empirical mode decomposition and fast Fourier transform
Empirical mode decomposition (EMD) was used to efficiently distinguish weak random-cavity emission from large broad spontaneous emission of the ZnO bulk and the multiple quantum wells (MQWs) structures. By fast Fourier transforming (FFT) the EMD results, we obtained the optical cavity lengths of ran...
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| Veröffentlicht in: | Applied physics letters 2021-09, Vol.119 (13) |
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| container_title | Applied physics letters |
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| creator | Wu, Yung-Chi Lan, Yu-Pin Liu, Wei-Rein Lin, Ja-Hon Lin, Bi-Hsuan Hsieh, Wen-Feng |
| description | Empirical mode decomposition (EMD) was used to efficiently distinguish weak random-cavity emission from large broad spontaneous emission of the ZnO bulk and the multiple quantum wells (MQWs) structures. By fast Fourier transforming (FFT) the EMD results, we obtained the optical cavity lengths of random lasing and their corresponding emission intensity. With increasing pumping power, the EMD-FFT method confirms that the nonlinear trend of the random lasing emission in ZnO bulk and the change in optical cavity length is a result of change in refractive index dispersion due to the bandgap renormalization with high excited carrier density in nonpolar a-plane ZnO MQWs. |
| doi_str_mv | 10.1063/5.0064709 |
| format | Article |
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By fast Fourier transforming (FFT) the EMD results, we obtained the optical cavity lengths of random lasing and their corresponding emission intensity. With increasing pumping power, the EMD-FFT method confirms that the nonlinear trend of the random lasing emission in ZnO bulk and the change in optical cavity length is a result of change in refractive index dispersion due to the bandgap renormalization with high excited carrier density in nonpolar a-plane ZnO MQWs.</description><identifier>ISSN: 0003-6951</identifier><identifier>EISSN: 1077-3118</identifier><identifier>DOI: 10.1063/5.0064709</identifier><identifier>CODEN: APPLAB</identifier><language>eng</language><publisher>Melville: American Institute of Physics</publisher><subject>Applied physics ; Carrier density ; Empirical analysis ; Fast Fourier transformations ; Fourier transforms ; Lasing ; Quantum wells ; Refractivity ; Spontaneous emission ; Zinc oxide ; Zinc oxides</subject><ispartof>Applied physics letters, 2021-09, Vol.119 (13)</ispartof><rights>Author(s)</rights><rights>2021 Author(s). 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| source | AIP Journals Complete; Alma/SFX Local Collection |
| subjects | Applied physics Carrier density Empirical analysis Fast Fourier transformations Fourier transforms Lasing Quantum wells Refractivity Spontaneous emission Zinc oxide Zinc oxides |
| title | Analyzing random lasing spectra of the zinc oxide bulk and the multiple quantum wells by empirical mode decomposition and fast Fourier transform |
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