Optical Properties of Porous Helical Thin Films

Popta, Andy C. van; Sit, Jeremy C.; Brett, Michael

doi:10.1364/ao.43.003632

Cited by 76 publications

(52 citation statements)

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“…This statement is supported by observations on both chiral liquid crystals [21] and chiral STFs [22]. Due to this ability to discriminate between left and right circularly polarized light, any helical film can be used for circular polarization elements including sources, reflectors, filters, and detectors [23][24][25][26]. The peak wavelength, (   )…”

Section: Introductionmentioning

confidence: 70%

Optical and Structural Properties of Bilayer Circular Filter Prepared by Glancing Angle Deposition

Park

Sobahan

Kim

et al. 2009

Journal of the Optical Society of Korea

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In this paper, we report the optical and structural properties of a bilayer circular filter fabricated by a glancing angle deposition technique. The bilayer circular filter is realized by a two-layer TiO2 helical film with layers of opposite structural handedness. It is found that the bilayer circular filter reflects both right and left circularly polarized light with wavelength lying in the Bragg regime. The microstructure of the bilayer circular filter is also investigated using a scanning electron microscope.

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Section: Introductionmentioning

confidence: 70%

Optical and Structural Properties of Bilayer Circular Filter Prepared by Glancing Angle Deposition

Park

Sobahan

Kim

et al. 2009

Journal of the Optical Society of Korea

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“…For GLAD, the substrate is rotated azimuthally with a constant speed, and an even more porous nanostructure is formed. The uses of OAD and GLAD techniques to create porous thin films are diverse and have been well documented [42][43][44][45][46][47][48][49].…”

Section: Methodsmentioning

confidence: 99%

“…GLAD samples were produced with an electron beam as the ablation tool, a substrate angle of a ¼ 86 8 and a substrate rotation rate of 0.5 rev min À1 . GLAD has produced 1-D nanostructures that were found to have novel optical, photocatalytic and magnetic properties [42,44,[46][47][48][49]. All of the PLD, OAD and GLAD samples were annealed at 550 8C in open air conditions with a Leister heat gun (Switzerland, CH-6056) prior to various experiments.…”

Section: Methodsmentioning

confidence: 99%

Photoelectrochemical Study of Nanostructured ZnO Thin Films for Hydrogen Generation from Water Splitting

Wolcott

Smith

Kuykendall

et al. 2009

Adv Funct Materials

447

246

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Photoelectrochemical cells based on traditional and nanostructured ZnO thin films are investigated for hydrogen generation from water splitting. The ZnO thin films are fabricated using three different deposition geometries: normal pulsed laser deposition, pulsed laser oblique‐angle deposition, and electron‐beam glancing‐angle deposition. The nanostructured films are characterized by scanning electron microscopy, X‐ray diffraction, UV‐vis spectroscopy and photoelectrochemical techniques. Normal pulsed laser deposition produces dense thin films with ca. 200 nm grain sizes, while oblique‐angle deposition produces nanoplatelets with a fishscale morphology and individual features measuring ca. 900 by 450 nm on average. In contrast, glancing‐angle deposition generates a highly porous, interconnected network of spherical nanoparticles of 15–40 nm diameter. Mott‐Schottky plots show the flat band potential of pulsed laser deposition, oblique‐angle deposition, and glancing‐angle deposition samples to be −0.29, −0.28 and +0.20 V, respectively. Generation of photocurrent is observed at anodic potentials and no limiting photocurrents were observed with applied potentials up to 1.3 V for all photoelectrochemical cells. The effective photon‐to‐hydrogen efficiency is found to be 0.1%, 0.2% and 0.6% for pulsed laser deposition, oblique‐angle deposition and glancing‐angle deposition samples, respectively. The photoelectrochemical properties of the three types of films are understood to be a function of porosity, crystal defect concentration, charge transport properties and space charge layer characteristics.

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“…The second class encompasses helicoidal columns and chiral-sculptured thin films, which are able to reproduce the behavior of cholesteric liquid crystals by preferentially reflecting circularly polarized light of the same handedness as the film's microstructure (circular Bragg phenomenon). Chiral filters based on this principle and presenting different degrees of complexity have been successfully designed and fabricated by OAD [77,79,[493][494][495].…”

Section: Passive Optical Applicationsmentioning

confidence: 99%

Perspectives on oblique angle deposition of thin films: From fundamentals to devices

Barranco

Borrás

González‐Elipe

et al. 2016

Progress in Materials Science

618

436

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a b s t r a c tThe oblique angle configuration has emerged as an invaluable tool for the deposition of nanostructured thin films. This review develops an up to date description of its principles, including the atomistic mechanisms governing film growth and nanostructuration possibilities, as well as a comprehensive description of the applications benefiting from its incorporation in actual devices. In contrast with other reviews on the subject, the electron beam assisted evaporation technique is analyzed along with other methods operating at oblique angles, including, among others, magnetron sputtering and pulsed laser or ion beam-assisted deposition techniques. To account for the existing differences between deposition in vacuum or in the presence of a plasma, mechanistic simulations are critically revised, discussing well-established paradigms such as the tangent or cosine rules, and proposing new models that explain the growth of tilted porous nanostructures. In the second part, we present an extensive description of applications wherein oblique-angle-deposited thin films are of relevance. From there, we proceed by considering the requirements of a large number of functional devices in which these films are currently being utilized (e.g., solar cells, Li batteries, electrochromic glasses, biomaterials, sensors, etc.), and subsequently describe how and why these nanostructured materials meet with these needs.

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Optical Properties of Porous Helical Thin Films

Cited by 76 publications

References 0 publications

Optical and Structural Properties of Bilayer Circular Filter Prepared by Glancing Angle Deposition

Optical and Structural Properties of Bilayer Circular Filter Prepared by Glancing Angle Deposition

Photoelectrochemical Study of Nanostructured ZnO Thin Films for Hydrogen Generation from Water Splitting

Perspectives on oblique angle deposition of thin films: From fundamentals to devices

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