Photonic Crystal Using Anodic Porous Alumina

Masuda, Hideki; Ohya, Masayuki; Asoh, Hidetaka; Nakao, Masashi; Nohtomi, Masaya; Tamamura, Toshiaki

doi:10.1143/jjap.38.l1403

Cited by 216 publications

(127 citation statements)

References 12 publications

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“…57 This remarkable work has been considered as a milestone in the field of anodization of metal and has triggered hundreds of papers describing the later achievements in the fabrication, modification, and application of nanoporous alumina. [58][59][60][61][62][63][64][65] The as-formed nanoporous alumina was used as photonic crystals and a template for nanomaterials' synthesis. [56][57][58][59][60] Accordingly, several models have been put forward to explain the growth mechanism of the self-organized alumina nanoporous layers.…”

Section: Fabrication Of Nanotubular Arrays Via Electrochemical Anodizmentioning

confidence: 99%

Nanotubular surface modification of metallic implants via electrochemical anodization technique

Wang¹,

Jin²,

Zheng³

et al. 2014

IJN

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Due to increased awareness and interest in the biomedical implant field as a result of an aging population, research in the field of implantable devices has grown rapidly in the last few decades. Among the biomedical implants, metallic implant materials have been widely used to replace disordered bony tissues in orthopedic and orthodontic surgeries. The clinical success of implants is closely related to their early osseointegration (ie, the direct structural and functional connection between living bone and the surface of a load-bearing artificial implant), which relies heavily on the surface condition of the implant. Electrochemical techniques for modifying biomedical implants are relatively simple, cost-effective, and appropriate for implants with complex shapes. Recently, metal oxide nanotubular arrays via electrochemical anodization have become an attractive technique to build up on metallic implants to enhance the biocompatibility and bioactivity. This article will thoroughly review the relevance of electrochemical anodization techniques for the modification of metallic implant surfaces in nanoscale, and cover the electrochemical anodization techniques used in the development of the types of nanotubular/nanoporous modification achievable via electrochemical approaches, which hold tremendous potential for bio-implant applications. In vitro and in vivo studies using metallic oxide nanotubes are also presented, revealing the potential of nanotubes in biomedical applications. Finally, an outlook of future growth of research in metallic oxide nanotubular arrays is provided. This article will therefore provide researchers with an in-depth understanding of electrochemical anodization modification and provide guidance regarding the design and tuning of new materials to achieve a desired performance and reliable biocompatibility.

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Section: Fabrication Of Nanotubular Arrays Via Electrochemical Anodizmentioning

confidence: 99%

Nanotubular surface modification of metallic implants via electrochemical anodization technique

Wang¹,

Jin²,

Zheng³

et al. 2014

IJN

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“…In the last twenty years, several methods have been established to fabricate photonic crystals at diverse length scales. as layer--by--layer stacking techniques using microfabrication tools [7][8][9], electrochemical etching [10,11], laser--beam--scanning chemical vapour deposition [12], and holographic lithography [13,14]. The periodicity of dielectric constant can be in one, two and three dimensions [15--18].…”

mentioning

confidence: 99%

Band gap splitting and average transmission lowering in ordered and disordered one-dimensional photonic structures composed by more than two materials with the same optical thickness

Kriegel

Scotognella

2015

Optics Communications

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The optical properties of photonic structures made with more than two materials are very interesting for optical filtering and lighting applications. Herein, we compared the transmission properties of one--dimensional photonic crystals made with three, four and five materials, showing that, with a photonic crystal made of t different materials, the band gap splits in t--1 bands. The same optical thickness for the different materials layers results in split photonic band gaps with the same intensity. Photonic crystals with more than two materials result in a simple structure that could be used for multi--feature optical filters, or that could provide feedback for multi--emission distributed feedback lasers. Furthermore, we analyzed the transmission properties of ternary and quaternary random photonic structures. These materials could very interesting for light trapping in photovoltaic devices. Introduction Photonic crystals provide the possibility to manipulate light: a periodic modulation of the refractive index results in a forbidden energy gap that excludes the existence of optical modes within a certain range of wavelengths [1--6]. In the last twenty years, several methods have been established to fabricate photonic crystals at diverse length scales. as layer--by--layer stacking techniques using microfabrication tools [7][8][9], electrochemical etching [10,11], laser--beam--scanning chemical vapour deposition [12], and holographic lithography [13,14]. The periodicity of dielectric constant can be in one, two and three dimensions [15--18]. In the case of one--dimensional structures, well established and low--cost fabrication technologies, as spin coating or co--extrusion, can be employed [15,19]. Recently, these materials are extensively studied since they find application in several fields, including photonics for low threshold laser action, high bending angle waveguide, super--prism effect, sensors and optical switches [20--25]. The calculation of the optical properties can be analytically performed with several theoretical methods, as a fully--vectorial algorithm to compute the definite--frequency eigenstates of Maxwell's equations, developed by Johnson and Joannopoulos [26], or the transfer matrix method [27]. In particular, the transfer matrix approach also allows to study the properties of photonic quasicrystals [28] and disordered photonic structures [29]. In the case on one--dimensional disordered, it is possible to employ also a finite element method [30]. Owing to their interesting features, the study of one--dimensional photonic crystals (1DPCs) made with more than two materials is recently increased. For example, ternary photonic crystals have been theoretically investigated [31,32]. With these crystals it is usually shown omnidirectional reflectance; an interesting case is a ternary Fibonacci sequence in which one of the three materials is a superconductor [33]. In 2012 quaternary photonic crystals have been proposed [34]. In this work, we compared the transmission properties of one--dimen...

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“…The pyramidal shape of the master is very suitable to press it on electropolished aluminum surface. Typically, a pressure for indentation as low as 5kN/cm 2 is used, which is 50 times lower than the dot-like stamp fabricated by Masuda's group [5,10]. In figure 2, we can see inverse pyramidal holes in the aluminum surface after indentation.…”

Section: Fabrication Of a Novel 4" Imprint Stampmentioning

confidence: 99%

“…Due to their low absorption coefficient, excellent thermal stability and easy handling, porous alumina structures could be potential materials for photonic crystals. However, since a perfect arrangement of porous alumina channels is required for 2-D PCs, only few studies on porous alumina photonic crystals exist [5][6][7]. To fabricate monodomain porous alumina structures, a method to pre-pattern the surface of aluminum before conventional anodization is a prerequisite.…”

Section: Introductionmentioning

confidence: 99%

Large-area porous alumina photonic crystals via imprint method

et al. 2002

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A perfect 2D porous alumina photonic crystal with 500 nm interpore distance was fabricated on an area of 4 cm 2 via imprint methods and subsequent electrochemical anodization. A 4'' imprint stamp consisting of a convex pyramid array was obtained by modern VLSI processing using DUV-lithography, anisotropic etching, LPCVD Si 3 N 4 deposition and wafer bonding. The optical properties of the porous alumina photonic crystal were measured with an infrared microscope in Γ-M direction. For both polarizations, a bandgap is observed at around 1 µm for r/a = 0.42. A reflectivity of almost unity for E-polarization in the region of the bandgap is a sign of the high quality of the structure, indicating almost no scattering losses. These experimental results could be correlated very well to the bandstructure as well as reflectivity calculations assuming a dielectric constant of ε = 2.0 for the anodized alumina.

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Photonic Crystal Using Anodic Porous Alumina

Cited by 216 publications

References 12 publications

Nanotubular surface modification of metallic implants via electrochemical anodization technique

Nanotubular surface modification of metallic implants via electrochemical anodization technique

Band gap splitting and average transmission lowering in ordered and disordered one-dimensional photonic structures composed by more than two materials with the same optical thickness

Large-area porous alumina photonic crystals via imprint method

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