Square spiral 3D photonic bandgap crystals at telecommunications frequencies

Jensen, Martin O.; Brett, Michael

doi:10.1364/opex.13.003348

Cited by 57 publications

(33 citation statements)

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“…(b) SEM micrographs of square-spiral Si structures arranged in a tetragonal lattice to form a 3D photonic crystal. This arrangement is obtained by deposition on a substrate with a periodic topography of small seeds, as shown in the right micrograph [506]. and methane at mild temperatures (150°C) [470].…”

Section: Gas and Vapor Sensorsmentioning

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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Section: Gas and Vapor Sensorsmentioning

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

View full text Add to dashboard Cite

show abstract

“…Mbise et al 14 reported extensively about angular selective transmittance of slanted columnar thin films from different materials with a potential application for window coatings. Rovira et al 15 investigated the phenomenon of optical activity and determined optical rotation of helical structured thin films, and Jensen and Brett 16 reported on reflectance and transmittance of three-dimensional photonic band gap crystals composed of square spirals, for example. Zhang and Zhao 17 theoretically investigated the pitch-height dependent optical extinction spectra of helical Ag nanostructures by the discrete dipole approximation.…”

Section: Introductionmentioning

confidence: 99%

Optical, structural, and magnetic properties of cobalt nanostructure thin films

Schmidt

Kjerstad

Hofmann

et al. 2009

Journal of Applied Physics

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We report on optical, structural, and magnetic properties of two substantially different cobalt nanostructure thin films deposited at an oblique angle of incidence of 85°away from the substrate normal. Comparison is made between an achiral columnar thin film grown without substrate rotation and a chiral nanocoil sculptured thin film by glancing angle deposition with substrate rotation. Generalized spectroscopic ellipsometry is employed to determine geometrical structure properties and the anisotropic optical constants of the films in the spectral range from 400 to 1000 nm. The magnetic properties are analyzed with a superconducting quantum interference device magnetometer. Both nanostructure thin films show highly anisotropic optical properties such as strong form birefringence and large dichroism. In particular, Co slanted columnar thin films are found to possess monoclinic optical properties. Magnetic measurements at room temperature show hysteresis anisotropy with respect to a magnetic field either parallel or perpendicular to the nanostructures' long axis. We find extremely large coercive fields of approximately 3 kOe for our achiral columnar nanostructures.

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“…3(b) shows an enlarged side view illustrating the intertwining between the adjacent spiral columns which are phase-shifted by an amount equivalent to c/2 (indicated by the yellow and red arrow). Such phase-shifting are straight-forward to implement in laser writing but not possible for other fabrication techniques like the glancing angle deposition [21].…”

Section: Resultsmentioning

confidence: 99%