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Silicon colloids: A new enabling nanomaterial
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View: Figures


Image of FIG. 1.
FIG. 1.

(Color online) Calculated scattering efficiency (Q sca) for 2 μm diameter microspheres made of silica (n = 1.46) and silicon (n = 3.5).

Image of FIG. 2.
FIG. 2.

(Color online) Optical microscopy images at 1000 × magnification of (a) porous and (b) amorphous silicon colloids. They were obtained by decomposing disilane at 400 °C for 1 and 5 min, respectively.

Image of FIG. 3.
FIG. 3.

(a) SEM image of a polycrystalline silicon colloid about 2 μm diameter, illustrating its spherical perfection and smooth surface. (b) TEM image of a polycrystalline silicon colloid showing well-defined crystalline domains. Such domains can be tens of nanometers in size. The image shows the frontier between the silicon colloid and the surrounding material.

Image of FIG. 4.
FIG. 4.

(Color online) Optical transmittance (black noisy curves) and Mie theory fit [gray (red) curves] for single silicon colloids of diameter (a) Φ = 1885 nm and (b) Φ = 1050 nm. The dips of transmittance correspond to WGM. They are indicated under their corresponding dips in (a) by the labels “b” and “a,” for transversal electric and transversal magnetic modes, respectively. The electric field intensity distribution is shown for modes (from left to right) a21, a31, and b41 in (b).

Image of FIG. 5.
FIG. 5.

(Color online) Transmittance spectra of 2 mg/cm2 layers of o/w emulsions containing, in weight, 1% TiO2 nanoparticles (P-25 Degussa) and 1% silicon colloids (a) in the UV range and (b) in the near IR range. Both emulsions were spread on PMMA Helioplates-HD6.

Image of FIG. 6.
FIG. 6.

(Color online) The interacting photonic force between two silicon spheres (diameter = 1.5 μm) as a function of the size parameter and the wavelength. The spheres’ distance (center to center) is 1.508 μm. Positive values indicate repulsive forces, and negative values indicate attractive forces. The intensity of the incident light is 10−4 W/μm2. The inset shows the geometry considered, indicating the polarization of the electric field, E, as well as the direction, k, of the incident light with respect to the dimmer position.


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Scitation: Silicon colloids: A new enabling nanomaterial