Science, Space and Technology News 2023
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Now these tiny pieces of glass are being uncovered from construction sites and archaeological digs and reveal themselves to be something extraordinary. On their surface is a mosaic of iridescent colors of blue, green, and orange, with some displaying shimmering gold-colored mirrors. The researchers soon realized that what they were looking at was the nanofabrication of photonic crystals by nature. “It’s really remarkable that you have glass that is sitting in the mud for two millennia and you end up with something that is a textbook example of a nanophotonic component,” said Omenetto.century CE, with origins from the sands of Egypt – an indication of global trade at the time.
How did this structure form over time? The researchers suggest a possible mechanism that played out patiently over centuries. “This is likely a process of corrosion and reconstruction,” said Guidetti. “The surrounding clay and rain determined the diffusion of minerals and a cyclical corrosion of the silica in the glass. At the same time, the assembly of 100 nanometer-thick layers combining the silica and minerals also occurred in cycles.
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