Intensity Modulation of Two Weakly Coupled Stimulated Oscillating Mechanical Modes in an Optomechanical Microbubble Resonator
We report that when two stimulating mechanical modes in an optomechanical microbubble resonator are weakly coupled to each other, strong oscillation intensity modulation occurs. The modulation was theoretically expected and experimentally observed. We theoretically derived the expressions of the cou...
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| Format: | Article |
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MDPI AG
2023-03-01
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| Series: | Photonics |
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| Online Access: | https://www.mdpi.com/2304-6732/10/4/365 |
| _version_ | 1827743990071427072 |
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| author | Xiayuqi Yu Lei Xu Liying Liu |
| author_facet | Xiayuqi Yu Lei Xu Liying Liu |
| author_sort | Xiayuqi Yu |
| collection | DOAJ |
| description | We report that when two stimulating mechanical modes in an optomechanical microbubble resonator are weakly coupled to each other, strong oscillation intensity modulation occurs. The modulation was theoretically expected and experimentally observed. We theoretically derived the expressions of the coupling coefficient between the mechanical modes and calculated the region where weak coupling happens. We found that weak coupling exists when the optical quality factor of the microcavity is high and the detuning of the pump laser is close to the beat frequency of the two mechanical modes. Experimentally, we observed that when two mechanical modes are both in stimulated oscillation, they undergo strong intensity modulation as the optical pump power changes, and the coupling coefficient of the two modes is estimated to be 0.962 at the pump power when one mode is in the stimulated region and the other mode is at a stimulating threshold; this proves that the two mechanical modes are weakly coupled. Our results extended the weak coupling conclusion in multimode laser emission to stimulated oscillation in multiple mechanical modes. |
| first_indexed | 2024-03-11T04:37:36Z |
| format | Article |
| id | doaj.art-bd7f2ccd966f40bb8326c81b4fa25dce |
| institution | Directory Open Access Journal |
| issn | 2304-6732 |
| language | English |
| last_indexed | 2024-03-11T04:37:36Z |
| publishDate | 2023-03-01 |
| publisher | MDPI AG |
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| series | Photonics |
| spelling | doaj.art-bd7f2ccd966f40bb8326c81b4fa25dce2023-11-17T20:57:01ZengMDPI AGPhotonics2304-67322023-03-0110436510.3390/photonics10040365Intensity Modulation of Two Weakly Coupled Stimulated Oscillating Mechanical Modes in an Optomechanical Microbubble ResonatorXiayuqi Yu0Lei Xu1Liying Liu2Key Lab for Micro and Nanophotonic Structures (Ministry of Education, China), Department of Optical Science and Engineering, School of Information Science and Engineering, Fudan University, Shanghai 200433, ChinaKey Lab for Micro and Nanophotonic Structures (Ministry of Education, China), Department of Optical Science and Engineering, School of Information Science and Engineering, Fudan University, Shanghai 200433, ChinaKey Lab for Micro and Nanophotonic Structures (Ministry of Education, China), Department of Optical Science and Engineering, School of Information Science and Engineering, Fudan University, Shanghai 200433, ChinaWe report that when two stimulating mechanical modes in an optomechanical microbubble resonator are weakly coupled to each other, strong oscillation intensity modulation occurs. The modulation was theoretically expected and experimentally observed. We theoretically derived the expressions of the coupling coefficient between the mechanical modes and calculated the region where weak coupling happens. We found that weak coupling exists when the optical quality factor of the microcavity is high and the detuning of the pump laser is close to the beat frequency of the two mechanical modes. Experimentally, we observed that when two mechanical modes are both in stimulated oscillation, they undergo strong intensity modulation as the optical pump power changes, and the coupling coefficient of the two modes is estimated to be 0.962 at the pump power when one mode is in the stimulated region and the other mode is at a stimulating threshold; this proves that the two mechanical modes are weakly coupled. Our results extended the weak coupling conclusion in multimode laser emission to stimulated oscillation in multiple mechanical modes.https://www.mdpi.com/2304-6732/10/4/365cavity optomechanicsmechanical lasingmechanical weak couplingmicrobubble resonator |
| spellingShingle | Xiayuqi Yu Lei Xu Liying Liu Intensity Modulation of Two Weakly Coupled Stimulated Oscillating Mechanical Modes in an Optomechanical Microbubble Resonator Photonics cavity optomechanics mechanical lasing mechanical weak coupling microbubble resonator |
| title | Intensity Modulation of Two Weakly Coupled Stimulated Oscillating Mechanical Modes in an Optomechanical Microbubble Resonator |
| title_full | Intensity Modulation of Two Weakly Coupled Stimulated Oscillating Mechanical Modes in an Optomechanical Microbubble Resonator |
| title_fullStr | Intensity Modulation of Two Weakly Coupled Stimulated Oscillating Mechanical Modes in an Optomechanical Microbubble Resonator |
| title_full_unstemmed | Intensity Modulation of Two Weakly Coupled Stimulated Oscillating Mechanical Modes in an Optomechanical Microbubble Resonator |
| title_short | Intensity Modulation of Two Weakly Coupled Stimulated Oscillating Mechanical Modes in an Optomechanical Microbubble Resonator |
| title_sort | intensity modulation of two weakly coupled stimulated oscillating mechanical modes in an optomechanical microbubble resonator |
| topic | cavity optomechanics mechanical lasing mechanical weak coupling microbubble resonator |
| url | https://www.mdpi.com/2304-6732/10/4/365 |
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