Federica Zaccagnini, Francesca Petronella, Nelson Tabiryan, Michael E. McConney, Jonathan Slagle, Kwang-Un Jeong, Timothy J. Bunning, Luciano De Sio
{"title":"Polarization-Independent Thermoplasmonic Optical Filtering Using Cholesteric Liquid Crystals and Gold Nanorod Arrays","authors":"Federica Zaccagnini, Francesca Petronella, Nelson Tabiryan, Michael E. McConney, Jonathan Slagle, Kwang-Un Jeong, Timothy J. Bunning, Luciano De Sio","doi":"10.1002/adpr.70293","DOIUrl":null,"url":null,"abstract":"<p>The photothermal response of a gold nanorods array to near-infrared irradiation is used to dynamically tune the Bragg reflection band of adjacent cholesteric liquid crystal (CLC) layers. By cascading two CLC cells with opposite handedness (right- and left-handed) and with the same peak Bragg wavelength, a compact device capable of reflecting nearly 100% of unpolarized incident light is achieved. The thermoplasmonic heating enables reversible spectral tuning of the reflection band over ~80 nm in the visible range via temperature-induced changes in birefringence and pitch. This strategy demonstrates a remotely actuated and contact-free platform for tunable optical filters, with potential applications in smart photonic devices, optical communications, sensing, and liquid crystal displays.</p>","PeriodicalId":7263,"journal":{"name":"Advanced Photonics Research","volume":"7 10","pages":""},"PeriodicalIF":4.0000,"publicationDate":"2026-10-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/adpr.70293","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Advanced Photonics Research","FirstCategoryId":"1085","ListUrlMain":"https://onlinelibrary.wiley.com/doi/10.1002/adpr.70293","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"MATERIALS SCIENCE, MULTIDISCIPLINARY","Score":null,"Total":0}
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Abstract
The photothermal response of a gold nanorods array to near-infrared irradiation is used to dynamically tune the Bragg reflection band of adjacent cholesteric liquid crystal (CLC) layers. By cascading two CLC cells with opposite handedness (right- and left-handed) and with the same peak Bragg wavelength, a compact device capable of reflecting nearly 100% of unpolarized incident light is achieved. The thermoplasmonic heating enables reversible spectral tuning of the reflection band over ~80 nm in the visible range via temperature-induced changes in birefringence and pitch. This strategy demonstrates a remotely actuated and contact-free platform for tunable optical filters, with potential applications in smart photonic devices, optical communications, sensing, and liquid crystal displays.
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