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3 article(s) from Geday, Morten A

Liquid crystal tunable claddings for polymer integrated optical waveguides

José M. Otón,
Manuel Caño-García,
Fernando Gordo,
Eva Otón,
Morten A. Geday and
Xabier Quintana

Beilstein J. Nanotechnol. 2019, 10, 2163–2170, doi:10.3762/bjnano.10.209

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Figure 1: COMSOL simulations of light propagation in a directional coupler and two MMIs, all having rectangul...

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Figure 2: Power output in the input waveguide as a function of the effective refractive index of the LC cladd...

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Figure 3: A directional coupler prototype showing power distribution between the output guides.

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Figure 4: Power density distribution in the first three periods (3L_π) of a 1 × 1 symmetric MMI and a 2 × 2 as...

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Figure 5: The characteristic length of an MMI is nearly constant until the cladding index reaches values clos...

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Figure 6: A number of SU8 PWG MMIs of different lengths prepared at the lab. The substrate is SiO₂ on an Si w...

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Figure 7: An MMI with inorganic Si₃N₄ core and high-birefringence LC cladding does not show variations in cha...

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Figure 8: Two waveguides at short distance interacting through evanescent fields. The interaction is tuned by...

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Full Research Paper

Published 05 Nov 2019

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Evaluation of replicas manufactured in a 3D-printed nanoimprint unit

Manuel Caño-García,
Morten A. Geday,
Manuel Gil-Valverde,
Xabier Quintana and
José M. Otón

Beilstein J. Nanotechnol. 2018, 9, 1573–1581, doi:10.3762/bjnano.9.149

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Figure 1: Two-step fabrication of samples. The left column shows three pictures taken at different angles of ...

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Figure 2: 2D saw-tooth sketch showing the blazing angle α and the back angle β. Measurements are confined to ...

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Figure 3: 3D sketch of a real saw-tooth copy compared to its theoretical master. The vertical difference betw...

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Figure 4: Plot of an actual saw-tooth copy showing the average height maxima (red points).

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Figure 5: Calculation of HOG descriptor for a given surface. Vectors points to the direction of highest gradi...

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Figure 6: Calculation of HOG descriptor. The histogram corresponding to the pixels of one cell. A 17-bin hist...

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Figure 7: Evaluation of HOG histograms. The example shows a 500 × 500 pixels (about 3 × 3 µm) fragment of an ...

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Figure 8: Summary of the results. The sample master and all 103 replica samples are presented. The bottom gra...

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Full Research Paper

Published 28 May 2018

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Reorientation of single-wall carbon nanotubes in negative anisotropy liquid crystals by an electric field

Amanda García-García,
Ricardo Vergaz,
José F. Algorri,
Gianluigi Zito,
Teresa Cacace,
Antigone Marino,
José M. Otón and
Morten A. Geday

Beilstein J. Nanotechnol. 2016, 7, 825–833, doi:10.3762/bjnano.7.74

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Figure 1: SWCNT-doped negative LC reorientation hypothesis: the LC remains homogeneously aligned while SWCNTs...

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Figure 2: Linear polarized light direction for Raman measures at V = 0.

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Figure 3: Raman spectra of a SWCNT-doped LC cell (λ = 523 nm). The G and G’-bands are related to SWCNTs. The ...

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Figure 4: Raman spectrum at different driving voltages (0 V, 1.5 V, 2.5 V, 3.5 V and 4.5 V). The microscope i...

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Figure 5: Raman G-band amplitude variation (below) during a driving voltage sequence between 0 and 11V_rms (ab...

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Figure 6: Cell images under microscopic study during a complete off–on–off voltage cycle. Sample surface (a) ...

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Figure 7: Impedance magnitude and phase measurements of (a) undoped and (b) SWCNT-doped LC cells.

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Figure 8: Impedance magnitude and phase variation at different frequencies as a function of applied driving v...

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Figure 9: Raman Intensity evolution of the G’-band and LC peaks with voltage. The SWCNT threshold voltage is ...

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Full Research Paper

Published 08 Jun 2016

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