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Silica aerogel is a very light and highly porous form of silica glass, with densities and refractive indices much lower than those of ordinary solids. We describe optical interactions with aerogel surrounding tapered fibres or inside the holes of photonic crystal fibres. This enables a new class of fibre devices exploiting the properties of the aerogel as a rigid yet porous replacement for air, as...
We have developed the new production methods of silica aerogel with the refractive indices between 1.15 and 1.25. Since the velocity of the photoelectric electron from the 511keV photon is 0.866c and the maximum velocity of the Compton electron is 0.8c, only photoelectric electrons occurs the Cherenkov light inside the radiator with n ~ 1.2. We are constructing the simple prototype PET detectors using...
New production methods of silica aerogel with high and low refractive indices have been developed. A very slow shrinkage of alcogel at room temperature has made possible producing aerogel with high refractive indices of up to 1.265 without cracks. Even higher refractive indices than 1.08, the transmission length of the aerogel obtained from this technique has been measured to be about 10 to 20 mm...
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