3 article(s) from Quintana, Xabier
- Full Research Paper
- Published 05 Nov 2019
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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 (3Lπ) 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 28 May 2018
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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 06 Feb 2015
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Figure 1: Schematic structure of a positive nematic MWCNTs-doped LC cell (a) without excitation voltage – pla...
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Figure 2: Sketch of frequency (a), resistance (a) and capacity (b, where Cr1 < Cr2 < Cr3) variations in the C...
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Figure 3: Light transmission response of undoped (top) and MWCNT-doped (bottom) cells at 543 nm. The bottom p...
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Figure 4: Cole-Cole plots of the undoped and MWCNTs-doped LC cells at different scales. (a), (b) and (c), imp...
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Figure 5: Impedance of unbiased doped (filled symbols) and undoped (unfilled symbols) samples at different in...
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Figure 6: R2 average evolution with the driving sequence. The three unbiased averaged measurements are shown ...
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Figure 7: Driving waveform for impedance measurements. Vp is peak voltage.
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