Nanostructured gradient index optical filter for high-speed humidity sensing

Steele, J.J.; Popta, Andy C. van; Hawkeye, Matthew M.; Sit, Jeremy C.; Brett, Michael

doi:10.1016/j.snb.2006.02.003

Cited by 102 publications

(71 citation statements)

References 26 publications

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“…[1][2][3] This anisotropy combined with their high open porosity [4][5][6][7] are essential for other applications such as Bragg reflectors with tunable optical response, 8 templates for nanocomposite films, [9][10][11][12] broad band antireflection coatings, 13,14 optical microresonators, 15 light emitting diodes, 16 photovoltaic cells, 17 advanced plasmon photocatalysis, 18,19 microfluidic sensors, 20 transparent conductive electrodes 21 and many others. In this technique, a given material is sublimated in a vacuum reactor, either thermally or assisted by an electron beam, yielding vapor species that follow straight trajectories in a "line of sight" configuration with respect to the substrate, and giving rise to thin films with well-defined tilted nanocolumnar structures.…”

Section: Introductionmentioning

confidence: 99%

Nanocolumnar growth of thin films deposited at oblique angles: Beyond the tangent rule

Álvarez

López‐Santos

Parra-Barranco

et al. 2014

Journal of Vacuum Science &Amp; Technology B, Nanotechnology and Microelectronics: Materials, Processing, Measurement, and Phen

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The growth of nanostructured physical vapor deposited thin films at oblique angles is becoming a hot topic for the development of a large variety of applications. Up to now, empirical relations, such as the so-called tangent rule, have been uncritically applied to account for the development of the nanostructure of these thin films even when they do not accurately reproduce most experimental results. In the present paper, the growth of thin films at oblique angles is analyzed under the premises of a recently proposed surface trapping mechanism. We demonstrate that this process mediates the effective shadowing area and determines the relation between the incident angle of the deposition flux and the 2 tilt angle of the columnar thin film nanostructures. The analysis of experimental data for a large variety of materials obtained in our laboratory and taken from the literature supports the existence of a connection between the surface trapping efficiency and the metallic character of the deposited materials. The implications of these predictive conclusions for the development of new applications based on oblique angle deposited thin films are discussed.

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Section: Introductionmentioning

confidence: 99%

Nanocolumnar growth of thin films deposited at oblique angles: Beyond the tangent rule

Álvarez

López‐Santos

Parra-Barranco

et al. 2014

Journal of Vacuum Science &Amp; Technology B, Nanotechnology and Microelectronics: Materials, Processing, Measurement, and Phen

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“…[ 9 ] Also, TiO 2 multilayered resonators with modulated porosity have been achieved by glancing-angle physical-vapor deposition and their capability to respond optically to humidity changes in their direct environment has been demonstrated. [ 10 ] Our group recently pioneered the use of metal oxides in the shape of both nanoparticles and mesostructured fi lms for the construction of 1DPCs and of porous optical resonators within them. [ 11 − 14 ] In these resonators it has been possible to measure the fi rst precise optical adsorption isotherms by taking advantage of the spectral shift of the narrow transmission window associated with the presence of the optical cavity that occurs when the partial pressure of the surrounding vapors is gradually increased.…”

Section: Introductionmentioning

confidence: 99%

Porous Supramolecularly Templated Optical Resonators Built in 1D Photonic Crystals

Hidalgo¹,

Calvo²,

Bellino³

et al. 2011

Adv Funct Materials

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A synthetic route to attain photonic multilayers that presents controlled porosity only at the middle-layer level is shown. The spectral resonance associated with this porous layer shows strong sensitivity to the presence of vapors adsorbed or condensed within the void network, providing a potentially relevant material for gas detection. The importance of the interplay between pore and probe-molecule diameters is studied and its implications in size-selective detection are discussed.

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“…By exploiting various rotation schemes for the substrate, a wide variety of thin-film morphologies including slanted columns, helices, S-shapes, C-shapes and zigzag/chevron structures can be fabricated [5][6][7][8]. Because of controlled porosity and microstructure, GLAD films have a wide range of suggested applications, such as three-dimensional photonic crystals [9][10][11], birefrigent omnidirectional reflectors [12], graded index optical filters [13,14], broadband antireflection coatings [15,16], linear polarizers [17], and fluid concentration sensors [18,19].…”

Section: Introductionmentioning

confidence: 99%

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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Nanostructured gradient index optical filter for high-speed humidity sensing

Cited by 102 publications

References 26 publications

Nanocolumnar growth of thin films deposited at oblique angles: Beyond the tangent rule

Nanocolumnar growth of thin films deposited at oblique angles: Beyond the tangent rule

Porous Supramolecularly Templated Optical Resonators Built in 1D Photonic Crystals

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

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