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https://hdl.handle.net/2440/130634
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Type: | Journal article |
Title: | Role of spectral resonance features and surface chemistry in the optical sensitivity of light-confining nanoporous photonic crystals |
Author: | Acosta, L.K. Law, S. Lim, S.Y. Abell, A.D. Marsal, L.F. Santos, A. |
Citation: | ACS Applied Materials and Interfaces, 2021; 13(12):14394-14406 |
Publisher: | American Chemical Society |
Issue Date: | 2021 |
ISSN: | 1944-8244 1944-8252 |
Statement of Responsibility: | Laura K. Acosta, Cheryl Suwen Law, Siew Yee Lim, Andrew D. Abell, Lluis F. Marsal and Abel Santos |
Abstract: | Nanoporous anodic alumina optical microcavities (NAA-μQVs) with spectrally tunable resonance band and surface chemistry are used as model light-confining photonic crystal (PC) platforms to elucidate the combined effect of spectral light confinement features and surface chemistry on optical sensitivity. These model nanoporous PCs show well-resolved, spectrally tunable resonance bands (RBs), the central wavelength of which is engineered from ∼400 to 800 nm by the period of the input anodization profile. The optical sensitivity of the as-produced (hydrophilic) and dichlorodimethylsilane-functionalized (hydrophobic) NAA-μQVs is studied by monitoring dynamic spectral shifts of their RB upon infiltration with organic- and aqueous-based analytical solutions of equally varying refractive index, from 1.333 to 1.345 RIU. Our findings demonstrate that hydrophilic NAA-μQVs show ∼81 and 35% superior sensitivity to their hydrophobic counterparts for organic- and aqueous-based analytical solutions, respectively. Interestingly, the sensitivity of hydrophilic NAA-μQVs per unit of spectral shift is more than 3-fold higher in organic than in aqueous matrices upon equal change of refractive index, with values of 0.347 ± 0.002 and 0.109 ± 0.001 (nm RIU<sup>-1</sup>) nm<sup>-1</sup>, respectively. Conversely, hydrophobic NAA-μQVs are found to be slightly more sensitive toward changes of refractive index in aqueous medium, with sensitivities of 0.072 ± 0.002 and 0.066 ± 0.006 (nm RIU<sup>-1</sup>) nm<sup>-1</sup> in water- and organic-based analytical solutions, respectively. Our advances provide insights into critical factors determining optical sensitivity in light-confining nanoporous PC structures, with implications across optical sensing applications, and other photonic technologies. |
Keywords: | light confinement nanoporous anodic alumina optical sensitivity photonic crystals surface chemistry |
Rights: | © 2021 American Chemical Society |
DOI: | 10.1021/acsami.1c00914 |
Grant ID: | http://purl.org/au-research/grants/arc/DP200102614 http://purl.org/au-research/grants/arc/CE140100003 |
Published version: | http://dx.doi.org/10.1021/acsami.1c00914 |
Appears in Collections: | Aurora harvest 8 Chemistry publications |
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