Highly Sensitive Thin‐Film Sensing with a Toroidal Dipole Resonance in the Midinfrared Supported by an E‐Shaped Germanium Metasurface
Optical sensing applications based on resonant structures always demand on novel optical resonances with large quality factors to achieve high sensitivities. Herein, it is experimentally demonstrated that a toroidal dipole (TD) response working in the midinfrared, supported by a metasurface structur...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Wiley-VCH
2022-11-01
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| Series: | Advanced Photonics Research |
| Subjects: | |
| Online Access: | https://doi.org/10.1002/adpr.202200129 |
| _version_ | 1811332805690392576 |
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| author | Min Sun Guangdong Wang Yuechun Shi Zhanghua Han |
| author_facet | Min Sun Guangdong Wang Yuechun Shi Zhanghua Han |
| author_sort | Min Sun |
| collection | DOAJ |
| description | Optical sensing applications based on resonant structures always demand on novel optical resonances with large quality factors to achieve high sensitivities. Herein, it is experimentally demonstrated that a toroidal dipole (TD) response working in the midinfrared, supported by a metasurface structure composed of E‐shaped germanium elements on a CaF2 substrate, can be harnessed to achieve high‐performance optical sensors. By elaborately designing the geometrical parameters of the E‐shaped element, a TD resonance can be supported, which is verified by multipole decomposition of the scattering spectrum. Thin films of polymethyl methacrylate (PMMA) with different thicknesses coated on top of the metasurface structures are used as an example to demonstrate the sensing characteristics of the TD resonance. Both numerical and experimental results show that the TD spectral position is highly dependent on the PMMA thickness and a minimum measurable thickness below 10 nm can be steadily achieved. The results demonstrate that the use of TD resonances provides an effective and viable approach for thin‐film sensing, which may find broad applications in biological and medical diagnosis. |
| first_indexed | 2024-04-13T16:42:28Z |
| format | Article |
| id | doaj.art-192e7a5bd7e74b8abfb2e402c48302cc |
| institution | Directory Open Access Journal |
| issn | 2699-9293 |
| language | English |
| last_indexed | 2024-04-13T16:42:28Z |
| publishDate | 2022-11-01 |
| publisher | Wiley-VCH |
| record_format | Article |
| series | Advanced Photonics Research |
| spelling | doaj.art-192e7a5bd7e74b8abfb2e402c48302cc2022-12-22T02:39:10ZengWiley-VCHAdvanced Photonics Research2699-92932022-11-01311n/an/a10.1002/adpr.202200129Highly Sensitive Thin‐Film Sensing with a Toroidal Dipole Resonance in the Midinfrared Supported by an E‐Shaped Germanium MetasurfaceMin Sun0Guangdong Wang1Yuechun Shi2Zhanghua Han3Shandong Provincial Key Laboratory of Optics and Photonic Devices Center of Light Manipulation and Applications School of Physics and Electronics Shandong Normal University Jinan 250358 ChinaShandong Provincial Key Laboratory of Optics and Photonic Devices Center of Light Manipulation and Applications School of Physics and Electronics Shandong Normal University Jinan 250358 ChinaYongjiang Laboratory Ningbo 315202 ChinaShandong Provincial Key Laboratory of Optics and Photonic Devices Center of Light Manipulation and Applications School of Physics and Electronics Shandong Normal University Jinan 250358 ChinaOptical sensing applications based on resonant structures always demand on novel optical resonances with large quality factors to achieve high sensitivities. Herein, it is experimentally demonstrated that a toroidal dipole (TD) response working in the midinfrared, supported by a metasurface structure composed of E‐shaped germanium elements on a CaF2 substrate, can be harnessed to achieve high‐performance optical sensors. By elaborately designing the geometrical parameters of the E‐shaped element, a TD resonance can be supported, which is verified by multipole decomposition of the scattering spectrum. Thin films of polymethyl methacrylate (PMMA) with different thicknesses coated on top of the metasurface structures are used as an example to demonstrate the sensing characteristics of the TD resonance. Both numerical and experimental results show that the TD spectral position is highly dependent on the PMMA thickness and a minimum measurable thickness below 10 nm can be steadily achieved. The results demonstrate that the use of TD resonances provides an effective and viable approach for thin‐film sensing, which may find broad applications in biological and medical diagnosis.https://doi.org/10.1002/adpr.202200129all-dielectric metasurfacesthin-film sensingtoroidal resonance |
| spellingShingle | Min Sun Guangdong Wang Yuechun Shi Zhanghua Han Highly Sensitive Thin‐Film Sensing with a Toroidal Dipole Resonance in the Midinfrared Supported by an E‐Shaped Germanium Metasurface Advanced Photonics Research all-dielectric metasurfaces thin-film sensing toroidal resonance |
| title | Highly Sensitive Thin‐Film Sensing with a Toroidal Dipole Resonance in the Midinfrared Supported by an E‐Shaped Germanium Metasurface |
| title_full | Highly Sensitive Thin‐Film Sensing with a Toroidal Dipole Resonance in the Midinfrared Supported by an E‐Shaped Germanium Metasurface |
| title_fullStr | Highly Sensitive Thin‐Film Sensing with a Toroidal Dipole Resonance in the Midinfrared Supported by an E‐Shaped Germanium Metasurface |
| title_full_unstemmed | Highly Sensitive Thin‐Film Sensing with a Toroidal Dipole Resonance in the Midinfrared Supported by an E‐Shaped Germanium Metasurface |
| title_short | Highly Sensitive Thin‐Film Sensing with a Toroidal Dipole Resonance in the Midinfrared Supported by an E‐Shaped Germanium Metasurface |
| title_sort | highly sensitive thin film sensing with a toroidal dipole resonance in the midinfrared supported by an e shaped germanium metasurface |
| topic | all-dielectric metasurfaces thin-film sensing toroidal resonance |
| url | https://doi.org/10.1002/adpr.202200129 |
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