Liu Yanjun, D. Xiao, Shengtao Yin, Jianxun Liu, D. Luo, Sun Xiaowei
We propose liquid-crystal-based reconfigurable chiral metasurface absorbers and numerically investigate their chiro-optical properties. The chiral metasurface absorber is based on a metal-insulator-metal structure on the substrate, which can strongly absorb a circularly polarized wave of one spin state and reflects that of the opposite spin, resulting a strong circular dichroism. A birefringent liquid crystal (LC) is exploited to serve as the insulator layer in the metal-insulator-metal structure. We could then vary the circular state of the incident light by controlling the alignment of the LC molecules, hence inversing the circular dichroism. The simulation results show that the sign of the circular dichroism can be effectively changed by externally controlling the alignment of the LC molecules in between the homogenous and homeotropic states. The absorption efficiency for the specific circularly polarized wave can be larger than 80% and the CD is nearly 70%. The simple and compact design of our proposed chiral metasurface absorber is especially favorable for integration, and such reconfigurable chiral metasurface absorber could find many potential applications in biological detection/sensing, polarimetric imaging, and optical communications.
{"title":"Liquid crystal-based reconfigurable chiral metasurface absorbers (Conference Presentation)","authors":"Liu Yanjun, D. Xiao, Shengtao Yin, Jianxun Liu, D. Luo, Sun Xiaowei","doi":"10.1117/12.2520497","DOIUrl":"https://doi.org/10.1117/12.2520497","url":null,"abstract":"We propose liquid-crystal-based reconfigurable chiral metasurface absorbers and numerically investigate their chiro-optical properties. The chiral metasurface absorber is based on a metal-insulator-metal structure on the substrate, which can strongly absorb a circularly polarized wave of one spin state and reflects that of the opposite spin, resulting a strong circular dichroism. A birefringent liquid crystal (LC) is exploited to serve as the insulator layer in the metal-insulator-metal structure. We could then vary the circular state of the incident light by controlling the alignment of the LC molecules, hence inversing the circular dichroism. The simulation results show that the sign of the circular dichroism can be effectively changed by externally controlling the alignment of the LC molecules in between the homogenous and homeotropic states. The absorption efficiency for the specific circularly polarized wave can be larger than 80% and the CD is nearly 70%. The simple and compact design of our proposed chiral metasurface absorber is especially favorable for integration, and such reconfigurable chiral metasurface absorber could find many potential applications in biological detection/sensing, polarimetric imaging, and optical communications.","PeriodicalId":231900,"journal":{"name":"Metamaterials XII","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127720650","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Oscillation electron model of doped superconducting bismuth selenide and telluride crystals (Conference Presentation)","authors":"N. P. Netesova","doi":"10.1117/12.2520378","DOIUrl":"https://doi.org/10.1117/12.2520378","url":null,"abstract":"","PeriodicalId":231900,"journal":{"name":"Metamaterials XII","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132044644","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-09-07DOI: 10.1103/PhysRevB.100.024515
V. Smolyaninova, J. Lynn, N. Butch, H. Chen-Mayer, J. Prestigiacomo, Michael Osofsky, I. Smolyaninov, I. Smolyaninov
A metamaterial approach is capable of drastically increasing the critical temperature, ${T}_{mathrm{c}}$, of composite metal-dielectric superconductors as demonstrated by the tripling of ${T}_{c}$ that was observed in bulk Al-${mathrm{Al}}_{2}{mathrm{O}}_{3}$ core-shell metamaterials. A theoretical model based on the Maxwell-Garnett approximation provides a microscopic explanation of this effect in terms of electron-electron pairing mediated by a hybrid plasmon-phonon excitation. We report an observation of this excitation in Al-${mathrm{Al}}_{2}{mathrm{O}}_{3}$ core-shell metamaterials using inelastic neutron scattering. This result provides support for this mechanism of superconductivity in metamaterials.
{"title":"Observation of plasmon-phonons in a metamaterial superconductor using inelastic neutron scattering (Conference Presentation)","authors":"V. Smolyaninova, J. Lynn, N. Butch, H. Chen-Mayer, J. Prestigiacomo, Michael Osofsky, I. Smolyaninov, I. Smolyaninov","doi":"10.1103/PhysRevB.100.024515","DOIUrl":"https://doi.org/10.1103/PhysRevB.100.024515","url":null,"abstract":"A metamaterial approach is capable of drastically increasing the critical temperature, ${T}_{mathrm{c}}$, of composite metal-dielectric superconductors as demonstrated by the tripling of ${T}_{c}$ that was observed in bulk Al-${mathrm{Al}}_{2}{mathrm{O}}_{3}$ core-shell metamaterials. A theoretical model based on the Maxwell-Garnett approximation provides a microscopic explanation of this effect in terms of electron-electron pairing mediated by a hybrid plasmon-phonon excitation. We report an observation of this excitation in Al-${mathrm{Al}}_{2}{mathrm{O}}_{3}$ core-shell metamaterials using inelastic neutron scattering. This result provides support for this mechanism of superconductivity in metamaterials.","PeriodicalId":231900,"journal":{"name":"Metamaterials XII","volume":"198 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115657193","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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