4.7 Article

Optical engineering of nanoporous photonic crystals by Gaussian-Like pulse anodization

Journal

MICROPOROUS AND MESOPOROUS MATERIALS
Volume 312, Issue -, Pages -

Publisher

ELSEVIER
DOI: 10.1016/j.micromeso.2020.110770

Keywords

Nanoporous anodic alumina; Photonic crystals; Forbidden light propagation; Gaussian-like anodization; Quality factor

Funding

  1. Australian Research Council (ARC) [CE140100003, DP200102614]
  2. School of Chemical Engineering and Advanced Materials
  3. University of Adelaide
  4. Institute for Photonics and Advanced Sensing (IPAS)
  5. ARC Centre of Excellence for Nanoscale BioPhotonics (CNBP)
  6. Spanish 'Ministerio de Ciencia, Innovacion y Universidades' [RTI2018-094040-B-I00]
  7. Agency for Management of University and Research Grants [2017-SGR-1527]
  8. Catalan Institution for Research and Advanced Studies (ICREA) under the ICREA Academia Award
  9. National Natural Science Foundation of China [21567021, 21765016, 21765017]
  10. National First-Rate Discipline Construction Project of Ningxia (Chemical Engineering and Technology) [NXYLXK2017A04]

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A new class of nanoporous anodic alumina photonic crystals (NAA-PCs) are optically engineered by four distinct forms of Gaussian-like pulse anodization (GLPA), allowing for precise tuning of their photonic stopbands (PSBs) across the UV-visible spectrum. Sensitivity of these PC structures to changes in their effective medium is determined by quantifying spectral shifts in their characteristic PSB upon infiltration with solutions of varying refractive index. These advancements provide opportunities for future developments of high-quality NAA-PCs with broad applicability in various photonic technologies.
A new class of nanoporous anodic alumina photonic crystals (NAA-PCs) are optically engineered by four distinct forms of Gaussian-like pulse anodization (GLPA) - Gaussian, Lorentzian, logarithmic normal, and Laplacian. NAA-PCs produced by GLPA under current density control conditions show well-resolved, spectrally tunable photonic stopbands (PSBs), the features of which - central wavelength, full width at half maximum, intensity, and quality factor - can be precisely tuned across the UV-visible spectrum by the input Gaussian-like current density pulses. Effects of type, width, and period of Gaussian-like current density pulses on the structural and optical properties of NAA-PCs are systematically assessed. Comprehensive electrochemical, structural, and optical characterizations allow us to elucidate the interplay of input GLPA profile and structural features in determining forbidden light propagation within these NAA-PCs. Sensitivity of these PC structures toward changes in their effective medium are determined by quantifying spectral shifts in their characteristic PSB upon infiltration of their nanoporous structure with analytical solutions of alcohol mixtures with varying refractive index, from 1.362 to 1.383 RIU. It is found that, at fixed anodization period, NAA-PCs produced by Laplacian current density pulses achieve the highest sensitivity (105 +/- 4 nm RIU-1) and, for a given type of GLPA, NAA-PCs produced with longer anodization period achieve higher sensitivity (123 +/- 10 nm RIU-1 for NAA-PCs fabricated by Gaussian pulses with a 1400 s-period). Our advances provide exciting new opportunities for future developments of high-quality NAA-PCs with broad applicability across various photonic technologies, including optical sensing, photocatalysis, lasing, and optical encoding.

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