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

Nanoscale
Cheryl Suwen LawAbel Santos

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 ...Continue Reading

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Citations

Sep 11, 2020·Sensors·Mahmoud Amouzadeh TabriziLluis F Marsal
Jan 23, 2021·Nanoscale·Alejandra Ruiz-ClavijoMarisol Martín-González
Feb 3, 2021·Nanotechnology·Sixiang LiuWang Zhang
Oct 20, 2021·ACS Applied Materials & Interfaces·Huong Nguyen Que TranAbel Santos

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Methods Mentioned

BETA
biosensing
scanning electron microscopy
light scattering

Software Mentioned

ImageJ
OriginPro
Labview®

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