Bound State in the Continuum Supported Asymmetric Dome-shaped Dielectric Metasurface: Crossing and Avoided Crossing of Transmission with Applications
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arXiv
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| Auteurs principaux: | , , , , , |
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| Format: | Preprint |
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2023
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| _version_ | 1866910461292707840 |
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| author | Islam, Ohidul Anik, M. Hussayeen Khan Shakib, Shakhawat Hossain Niloy, Nahid Hasan Talukder, Hriteshwar Biswas, Shovasis Kumar |
| author_facet | Islam, Ohidul Anik, M. Hussayeen Khan Shakib, Shakhawat Hossain Niloy, Nahid Hasan Talukder, Hriteshwar Biswas, Shovasis Kumar |
| contents | This work examines a symmetry-protected bound state in the continuum (BIC) supported unique all-dielectric dome-shaped metasurface (MS). The simple unit MS is made up of four dome-shaped nanobars of silicon in the top layer and silica glass as the substrate. Two strong transmission dips denoted as an electric dipole (ED) and magnetic dipole (MD) quasi-BIC with a high Q-factor that surpasses the value of 104 are observed after the symmetry between the nanobars is broken by a small angle from their initial position. A crossover between the ED and MD resonances is noticed when the periodicity of the MS is changed in the y direction. In addition, transmission spectra show the avoided-crossing phenomenon of dipole quasi-BIC resonances when the superstrate's refractive index (RI) is reduced from its initial value. Other widely used dielectric materials are additionally employed in dome-shaped nanobars to evaluate their performances in terms of sharpness and near-zero transmission. Moreover, Other forms of symmetry breakdown such as diagonal width and length asymmetry have been investigated for their impact on the Q-factor. Finally, we have demonstrated two significant applications, including refractometric glucose sensing and third harmonic generation (THG). Our dome-shaped MS is roughly 300 times more efficient at generating third harmonics than a flat rectangular silicon film MS. Our proposed BIC and q-BIC-facilitated MS may provide a method for enhancing the functionality of biological sensors, multimodal lasing, optical switches, and nonlinear optics. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2310_00422 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Bound State in the Continuum Supported Asymmetric Dome-shaped Dielectric Metasurface: Crossing and Avoided Crossing of Transmission with Applications Islam, Ohidul Anik, M. Hussayeen Khan Shakib, Shakhawat Hossain Niloy, Nahid Hasan Talukder, Hriteshwar Biswas, Shovasis Kumar Optics Applied Physics This work examines a symmetry-protected bound state in the continuum (BIC) supported unique all-dielectric dome-shaped metasurface (MS). The simple unit MS is made up of four dome-shaped nanobars of silicon in the top layer and silica glass as the substrate. Two strong transmission dips denoted as an electric dipole (ED) and magnetic dipole (MD) quasi-BIC with a high Q-factor that surpasses the value of 104 are observed after the symmetry between the nanobars is broken by a small angle from their initial position. A crossover between the ED and MD resonances is noticed when the periodicity of the MS is changed in the y direction. In addition, transmission spectra show the avoided-crossing phenomenon of dipole quasi-BIC resonances when the superstrate's refractive index (RI) is reduced from its initial value. Other widely used dielectric materials are additionally employed in dome-shaped nanobars to evaluate their performances in terms of sharpness and near-zero transmission. Moreover, Other forms of symmetry breakdown such as diagonal width and length asymmetry have been investigated for their impact on the Q-factor. Finally, we have demonstrated two significant applications, including refractometric glucose sensing and third harmonic generation (THG). Our dome-shaped MS is roughly 300 times more efficient at generating third harmonics than a flat rectangular silicon film MS. Our proposed BIC and q-BIC-facilitated MS may provide a method for enhancing the functionality of biological sensors, multimodal lasing, optical switches, and nonlinear optics. |
| title | Bound State in the Continuum Supported Asymmetric Dome-shaped Dielectric Metasurface: Crossing and Avoided Crossing of Transmission with Applications |
| topic | Optics Applied Physics |
| url | https://arxiv.org/abs/2310.00422 |