Dual bound states in the continuum enhanced second harmonic generation with transition metal dichalcogenides monolayer
The emergence of two dimensional (2D) materials has opened new possibilities for exhibiting second harmonic generation (SHG) at the nanoscale, due to their remarkable optical response related to stable excitons at room temperature. However, the ultimate atomic-scale interaction length with light mak...
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| Format: | Article |
| Language: | English |
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Institue of Optics and Electronics, Chinese Academy of Sciences
2022-07-01
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| Series: | Opto-Electronic Advances |
| Subjects: | |
| Online Access: | https://www.oejournal.org/article/doi/10.29026/oea.2022.200097 |
| _version_ | 1828288093249077248 |
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| author | Peilong Hong Lei Xu Mohsen Rahmani |
| author_facet | Peilong Hong Lei Xu Mohsen Rahmani |
| author_sort | Peilong Hong |
| collection | DOAJ |
| description | The emergence of two dimensional (2D) materials has opened new possibilities for exhibiting second harmonic generation (SHG) at the nanoscale, due to their remarkable optical response related to stable excitons at room temperature. However, the ultimate atomic-scale interaction length with light makes the SHG of Transition Metal Dichalcogenides (TMDs) monolayers naturally weak. Here, we propose coupling a monolayer of TMDs with a photonic grating slab that works with doubly resonant bound states in the continuum (BIC). The BIC slabs are designed to exhibit a pair of BICs, resonant with both the fundamental wave (FW) and the second harmonic wave (SHW). Firstly, the spatial mode matching can be fulfilled by tilting FW's incident angle. We theoretically demonstrate that this strategy leads to more than four orders of magnitude enhancement of SHG efficiency than a sole monolayer of TMDs, under a pump light intensity of 0.1 GW/cm2. Moreover, we demonstrate that patterning the TMDs monolayer can further enhance the spatial overlap coefficient, which leads to an extra three orders of magnitude enhancement of SHG efficiency. These results demonstrate remarkable possibilities for enhancing SHG with nonlinear 2D materials, opening many opportunities for chip-based light sources, nanolasers, imaging, and biochemical sensing. |
| first_indexed | 2024-04-13T09:58:45Z |
| format | Article |
| id | doaj.art-a516013f3f9747aea80765d5535f37b4 |
| institution | Directory Open Access Journal |
| issn | 2096-4579 |
| language | English |
| last_indexed | 2024-04-13T09:58:45Z |
| publishDate | 2022-07-01 |
| publisher | Institue of Optics and Electronics, Chinese Academy of Sciences |
| record_format | Article |
| series | Opto-Electronic Advances |
| spelling | doaj.art-a516013f3f9747aea80765d5535f37b42022-12-22T02:51:17ZengInstitue of Optics and Electronics, Chinese Academy of SciencesOpto-Electronic Advances2096-45792022-07-01571810.29026/oea.2022.200097oea-2020-0097-MohsenDual bound states in the continuum enhanced second harmonic generation with transition metal dichalcogenides monolayerPeilong Hong0Lei Xu1Mohsen Rahmani2School of Optoelectronic Science and Engineering, University of Electronic Science and Technology of China (UESTC), Chengdu 611731, ChinaAdvanced Optics Photonics Laboratory, Department of Engineering, School of Science Technology, Nottingham Trent University, Nottingham NG11 8NS, UKAdvanced Optics Photonics Laboratory, Department of Engineering, School of Science Technology, Nottingham Trent University, Nottingham NG11 8NS, UKThe emergence of two dimensional (2D) materials has opened new possibilities for exhibiting second harmonic generation (SHG) at the nanoscale, due to their remarkable optical response related to stable excitons at room temperature. However, the ultimate atomic-scale interaction length with light makes the SHG of Transition Metal Dichalcogenides (TMDs) monolayers naturally weak. Here, we propose coupling a monolayer of TMDs with a photonic grating slab that works with doubly resonant bound states in the continuum (BIC). The BIC slabs are designed to exhibit a pair of BICs, resonant with both the fundamental wave (FW) and the second harmonic wave (SHW). Firstly, the spatial mode matching can be fulfilled by tilting FW's incident angle. We theoretically demonstrate that this strategy leads to more than four orders of magnitude enhancement of SHG efficiency than a sole monolayer of TMDs, under a pump light intensity of 0.1 GW/cm2. Moreover, we demonstrate that patterning the TMDs monolayer can further enhance the spatial overlap coefficient, which leads to an extra three orders of magnitude enhancement of SHG efficiency. These results demonstrate remarkable possibilities for enhancing SHG with nonlinear 2D materials, opening many opportunities for chip-based light sources, nanolasers, imaging, and biochemical sensing.https://www.oejournal.org/article/doi/10.29026/oea.2022.200097second harmonic generationtransition metal dichalcogenidesbound state in the continuumphotonic grating slab |
| spellingShingle | Peilong Hong Lei Xu Mohsen Rahmani Dual bound states in the continuum enhanced second harmonic generation with transition metal dichalcogenides monolayer Opto-Electronic Advances second harmonic generation transition metal dichalcogenides bound state in the continuum photonic grating slab |
| title | Dual bound states in the continuum enhanced second harmonic generation with transition metal dichalcogenides monolayer |
| title_full | Dual bound states in the continuum enhanced second harmonic generation with transition metal dichalcogenides monolayer |
| title_fullStr | Dual bound states in the continuum enhanced second harmonic generation with transition metal dichalcogenides monolayer |
| title_full_unstemmed | Dual bound states in the continuum enhanced second harmonic generation with transition metal dichalcogenides monolayer |
| title_short | Dual bound states in the continuum enhanced second harmonic generation with transition metal dichalcogenides monolayer |
| title_sort | dual bound states in the continuum enhanced second harmonic generation with transition metal dichalcogenides monolayer |
| topic | second harmonic generation transition metal dichalcogenides bound state in the continuum photonic grating slab |
| url | https://www.oejournal.org/article/doi/10.29026/oea.2022.200097 |
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