Inhomogeneous thin film optical filters fabricatedusing glancing angle deposition

Robbie, Kevin; Hnatiw, A.J.P.; Brett, Michael; MacDonald, R.I.; McMullin, J.N.

doi:10.1049/el:19970834

Cited by 54 publications

(17 citation statements)

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“…This technique has been used in various applications in optical and semiconductor devices. [59][60][61][62][63][64][65][66][67][68][69][70][71][72][73] …”

Section: B Glancing-angle Depositionmentioning

confidence: 99%

Deposited nanorod films for photonic crystal biosensor applications

Zhang

Kim

Ganesh

et al. 2010

Journal of Vacuum Science &Amp; Technology A: Vacuum, Surfaces, and Films

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Planar photonic crystals have been used as the basis of many biological sensing devices. Here, the authors successfully demonstrated that the combination of the photonic crystal structures and a dielectric nanorod coating prepared by the glancing-angle deposition technique can lead to significant increases in the device sensitivity. By incorporating a TiO2 nanorod coating onto the label-free photonic crystal biosensor structure, the surface area of the device is increased. The results for detection of polymer films and proteins indicate up to a 5.5 fold enhancement of detected adsorbed mass density.

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“…This technique has been used in various applications in optical and semiconductor devices. [59][60][61][62][63][64][65][66][67][68][69][70][71][72][73] …”

Section: B Glancing-angle Depositionmentioning

confidence: 99%

Deposited nanorod films for photonic crystal biosensor applications

Zhang

Kim

Ganesh

et al. 2010

Journal of Vacuum Science &Amp; Technology A: Vacuum, Surfaces, and Films

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“…GLAD and related techniques such as sculptured thin films (STFs) 21,22 have been demonstrated in experimental and modelling studies for a range of optical devices such as rugate filters 23,24 and Šolc filters 25 , among many other envisioned applications.…”

Section: Relevant Optical Studiesmentioning

confidence: 99%

Thin film/liquid crystal composite optical materials

Sit

Brett

2003

Liquid Crystals VII

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The classic challenge faced by researchers dealing with liquid crystals is to control the LC molecular orientation and hence optimise the optical properties. Well known techniques for influencing LC texture include the use of surfactants or thin film alignment layers. The underlying limitation common to such techniques is that while excellent control of LC anchoring at the substrate surface is achieved, molecular alignment in the bulk of the LC is reliant entirely upon the cooperative effects and resulting elastic properties of the LC material. Generally, this has worked sufficiently well in practice, but unfortunately, the complete dependence on the intermolecular forces of the LC means that unencumbered, reversible switching is not always possible. Our group has taken a unique approach to influence LC orientation. Using glancing angle deposition (GLAD), highly porous thin films can be grown possessing isolated columnar microstructure whose shape can be tailored via substrate motion during film deposition. In particular, we can grow films of helical columns with controlled pitch and handedness. These films exhibit circular dichroism and optical activity similar to that seen in chiral LCs. The high porosity of GLAD films permits fluids such as LCs to be introduced into the pores, leading to a new type of hybrid optical material. Most significantly, initial work showed that when achiral LCs were embedded in chiral GLAD media, there was an enhancement of the circular dichroism and optical activity as the chiral GLAD film served to induce a chiral orientation in the LC. In this report, we start with a brief overview of the GLAD process and some relevant optical studies, leading to a review of GLAD/LC hybrid materials, switchable devices, and finally, a discussion of recent research optical characterisation and some ideas for future avenues of investigation.

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“…Thin films with nanostructures were fabricated based on OAD from various materials, including Cu, Fe, Al, Y 2 O 3 , TiO 2 , MgF 2 , C, Si, and ZnS [11][12][13][14][15][16][17][18]. The films exhibit low stress, a high surface area, and intrinsically anisotropic physical properties such as dichroism, birefringence, and anisotropic resistivity [19,20].…”

Section: Introductionmentioning

confidence: 99%