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Issue 29, 2018
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Structural tailoring of nanoporous anodic alumina optical microcavities for enhanced resonant recirculation of light

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Abstract

A comprehensive study about the structural engineering of high quality nanoporous anodic alumina optical microcavities (NAA-μCVs) fabricated by rationally designed anodisation strategies to enhance the light-confining capabilities of these photonic crystal (PC) structures is presented. Two types of NAA-μCV architectures are produced: (i) GIF-NAA-μCVs composed of a cavity layer featuring straight nanopores that is sandwiched between two gradient-index filters (GIFs) with sinusoidally modulated porosity in depth, and (ii) DBR-NAA-μCVs formed by sandwiching a cavity layer with straight nanopores between two distributed Bragg reflectors (DBRs), in which the porosity is engineered in a stepwise fashion. The geometric features of GIF-NAA-μCVs and DBR-NAA-μCVs are engineered and optimised through a systematic modification of the anodisation parameters (i.e. cavity anodisation time, cavity anodisation current density, anodisation period and number of anodisation pulses, and pore widening time). This methodology enables fine-tuning of the optical properties of GIF-NAA-μCVs and DBR-NAA-μCVs, such as quality factor and position and width of resonance band, to generate NAA-μCVs with unprecedented quality factors (i.e. 170 ± 8 and 206 ± 10 for the first and second order resonance bands – threefold and fourfold quality enhancement as compared to previous studies). Our results demonstrate that an optimal design of the geometric features and the nanoporous architecture of NAA-μCVs can significantly enhance resonant recirculation of light within these PC structures, creating new opportunities to develop ultrasensitive optical platforms, highly selective optical filters, and other photonic devices.

Graphical abstract: Structural tailoring of nanoporous anodic alumina optical microcavities for enhanced resonant recirculation of light

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Publication details

The article was received on 26 May 2018, accepted on 04 Jul 2018 and first published on 04 Jul 2018


Article type: Paper
DOI: 10.1039/C8NR04263B
Citation: Nanoscale, 2018,10, 14139-14152
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    Structural tailoring of nanoporous anodic alumina optical microcavities for enhanced resonant recirculation of light

    C. S. Law, S. Y. Lim, A. D. Abell, L. F. Marsal and A. Santos, Nanoscale, 2018, 10, 14139
    DOI: 10.1039/C8NR04263B

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