Giant second-harmonic generation in monolayer MoS2 boosted by dual bound states in the continuum
Dielectric metasurfaces open new avenues in nonlinear optics through their remarkable capability of boosting frequency conversion efficiency of nonlinear optical interactions. Here, a metasurface consisting of a square array of cruciform-shaped silicon building blocks covered by a monolayer MoS2 is...
Saved in:
| Main Authors: | , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
De Gruyter
2024-07-01
|
| Series: | Nanophotonics |
| Subjects: | |
| Online Access: | https://doi.org/10.1515/nanoph-2024-0273 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1846157293109903360 |
|---|---|
| author | Wang Ji Tong You Jian Wei Panoiu Nicolae C. |
| author_facet | Wang Ji Tong You Jian Wei Panoiu Nicolae C. |
| author_sort | Wang Ji Tong |
| collection | DOAJ |
| description | Dielectric metasurfaces open new avenues in nonlinear optics through their remarkable capability of boosting frequency conversion efficiency of nonlinear optical interactions. Here, a metasurface consisting of a square array of cruciform-shaped silicon building blocks covered by a monolayer MoS2 is proposed. By designing the metasurface so that it supports optical bound states in the continuum (BICs) at the fundamental frequency and second harmonic, nearly 600× enhancement of the second-harmonic generation (SHG) in the MoS2 monolayer as compared to that of the same MoS2 monolayer suspended in air is achieved. To gain deeper insights into the physics of the metasurface-induced enhancement of nonlinear optical interactions, an eigenmode expansion method is employed to analytically investigate the main characteristics of SHG and the results show a good agreement with the results obtained via full-wave numerical simulations. In addition, a versatile nonlinear homogenization approach is used to highlight and understand the interplay between the BICs of the metasurface and the efficiency of the SHG process. This work suggests a promising method to enhance the nonlinear optical processes in two-dimensional materials, enabling the development of advanced photonic nanodevices. |
| format | Article |
| id | doaj-art-31fdbee0f6db4a36817de75c81eba78c |
| institution | Kabale University |
| issn | 2192-8614 |
| language | English |
| publishDate | 2024-07-01 |
| publisher | De Gruyter |
| record_format | Article |
| series | Nanophotonics |
| spelling | doaj-art-31fdbee0f6db4a36817de75c81eba78c2024-11-25T11:19:12ZengDe GruyterNanophotonics2192-86142024-07-0113183437344810.1515/nanoph-2024-0273Giant second-harmonic generation in monolayer MoS2 boosted by dual bound states in the continuumWang Ji Tong0You Jian Wei1Panoiu Nicolae C.2University College London, London, UKSoutheast University, Nanjing, ChinaUniversity College London, London, UKDielectric metasurfaces open new avenues in nonlinear optics through their remarkable capability of boosting frequency conversion efficiency of nonlinear optical interactions. Here, a metasurface consisting of a square array of cruciform-shaped silicon building blocks covered by a monolayer MoS2 is proposed. By designing the metasurface so that it supports optical bound states in the continuum (BICs) at the fundamental frequency and second harmonic, nearly 600× enhancement of the second-harmonic generation (SHG) in the MoS2 monolayer as compared to that of the same MoS2 monolayer suspended in air is achieved. To gain deeper insights into the physics of the metasurface-induced enhancement of nonlinear optical interactions, an eigenmode expansion method is employed to analytically investigate the main characteristics of SHG and the results show a good agreement with the results obtained via full-wave numerical simulations. In addition, a versatile nonlinear homogenization approach is used to highlight and understand the interplay between the BICs of the metasurface and the efficiency of the SHG process. This work suggests a promising method to enhance the nonlinear optical processes in two-dimensional materials, enabling the development of advanced photonic nanodevices.https://doi.org/10.1515/nanoph-2024-0273dielectric metasurfacesbound states in the continuummonolayer molybdenum disulfidesecond-harmonic generationeigenmode expansion methodnonlinear homogenization |
| spellingShingle | Wang Ji Tong You Jian Wei Panoiu Nicolae C. Giant second-harmonic generation in monolayer MoS2 boosted by dual bound states in the continuum Nanophotonics dielectric metasurfaces bound states in the continuum monolayer molybdenum disulfide second-harmonic generation eigenmode expansion method nonlinear homogenization |
| title | Giant second-harmonic generation in monolayer MoS2 boosted by dual bound states in the continuum |
| title_full | Giant second-harmonic generation in monolayer MoS2 boosted by dual bound states in the continuum |
| title_fullStr | Giant second-harmonic generation in monolayer MoS2 boosted by dual bound states in the continuum |
| title_full_unstemmed | Giant second-harmonic generation in monolayer MoS2 boosted by dual bound states in the continuum |
| title_short | Giant second-harmonic generation in monolayer MoS2 boosted by dual bound states in the continuum |
| title_sort | giant second harmonic generation in monolayer mos2 boosted by dual bound states in the continuum |
| topic | dielectric metasurfaces bound states in the continuum monolayer molybdenum disulfide second-harmonic generation eigenmode expansion method nonlinear homogenization |
| url | https://doi.org/10.1515/nanoph-2024-0273 |
| work_keys_str_mv | AT wangjitong giantsecondharmonicgenerationinmonolayermos2boostedbydualboundstatesinthecontinuum AT youjianwei giantsecondharmonicgenerationinmonolayermos2boostedbydualboundstatesinthecontinuum AT panoiunicolaec giantsecondharmonicgenerationinmonolayermos2boostedbydualboundstatesinthecontinuum |